Articles de revues : « Mycorrhizha »

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Valdes, María. « Aspectos ecofisiológicos de las micorrizas ». Botanical Sciences, n^o 49 (10 avril 2017) : 19. http://dx.doi.org/10.17129/botsci.1363.

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Mycorrhiza is the part of the roots infected with particular soil fungi. This type of association is formed by most of the plants. There are several types of mycorrhizae; this short review is concerned only with Ectomycorrhiza (EM) and the Vesicular-Arbuscular Mycorrhiza (VAM). These two types are the most common in nature. EM has a compact fungus mantle over the root surface and intercellular hypha in the cortex; the V AM has a loose network of hyphae in the soil surrounding the root and hyphal growth within the cortical cells. Mycorrhizas increase nutrient uptake and hence plant growth. Since mycorrhizas are surrounded by an extensive hyphal network than may extcnd into the soil, this network represents a greater surface area, in other words, mycorrhizas shorten the distance that nutrients must diffuse through the soil to the root and their hyphae increase the volume of soil available to the plant for nutrient uptake. Physiological responses to root colonization with mycorrhizal fungi by most of the plants are dependent on the level of soil fertility and on the degree of mycorrhizal dependency of the plant. Soils having a high fertility have mostly a poor colonization, hence, for plant growth to respond to inoculation, soils must have a low fertility. Mycorrhizal dependency can be very different among plant species; plants with short root hairs are more dependent on mycorrhizal fungi. Most soils contain mycorrhizal fungi and their distribution varies with climatic, edaphic environment and land use. There are differences in effectiveness in colonization and in enhanced nutrient uptake among the fungi.

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Bryndina, Larisa, Yuliya Arnaut et Olesya Alykova. « MYCORRHIZAL FUNGI IN THE FORMATION OF BIOGEOCENOSES : ANALYTICAL REVIEW ». Forestry Engineering Journal 12, n^o 1 (15 avril 2022) : 5–24. http://dx.doi.org/10.34220/issn.2222-7962/2022.1/1.

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This review examines the results of scientific experiments of foreign and domestic researchers in the field of studying mycorrhizal associations, the mechanisms of their symbiosis with plants. The information about the current state of the issue is given: different points of view on the interaction of mycorrhizal plants with mycobionts. A comparative analysis of the development of mycorrhiza in individual plant species was carried out. It was found that the maximum degree of mycorrhiza development corresponds to the beech and linden families. The factors influencing the development of balanced and exploitive mycorrhizal associations are considered. The evolutionary and functional characteristics of the types of mycorrhizae are given. The benefits of mycorrhizal associations are considered, both for tree species and for species of fungi involved in the formation of mycorrhizae. The role of symbionts in mycorrhiza is considered, as well as the form and degree of development of mycorrhiza for mycotrophic plants. An analytical review of the studies of foreign and domestic scientists allowed us to determine the preferred mycorrhizal communities for reforestation. It was noted that unfavorable, extreme environmental conditions in most cases intensified the growth and development of mycorrhizal communities. All these factors should be taken into account when selecting tree species and types of fungi in forestry during reforestation

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Ruotsalainen, Anna Liisa, et Sami Aikio. « Mycorrhizal inoculum and performance of nonmycorrhizal Carex bigelowii and mycorrhizal Trientalis europaea ». Canadian Journal of Botany 82, n^o 4 (1 avril 2004) : 443–49. http://dx.doi.org/10.1139/b04-011.

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We studied the competition between mycorrhiza-forming Trientalis europaea L. and nonmycorrhizal Carex bigelowii Torrey ex Schweinitz in a climate chamber experiment. The plants were grown either singly or together with a conspecific or heterospecific individual, with arbuscular mycorrhizal inoculum present or absent. Inoculated T. euro paea formed abundant arbuscular mycorrhizal structures, but the mycorrhizae did not affect its biomass or the whole plant's relative growth rate (RGR). Carex bigelowii did not form mycorrhizae, but its shoot biomass and RGR were lower in the inoculated pots. The presence of a conspecific or heterospecific plant had no effect on the shoot biomasses or RGR of either plant species. Mycorrhizal inoculation increased the root/shoot ratio of C. bigelowii in all competition treatments. The presence of C. bigelowii decreased the root/shoot ratio of T. europaea in both mycorrhizal and nonmy corrhizal state. Mycorrhizal inoculum thus had a direct negative effect on the growth of a nonmycorrhizal plant. The result suggests that although mycorrhizae may not always directly affect the performance of the host plant, they may possibly increase the host plant performance in relation to nonmycorrhizal neighbours. Mycorrhizal inoculum and mycorrhizal symbiosis may increase asymmetry of interspecific competition, which may facilitate the coexistence of plant species in cases when a larger individual is more negatively affected.Key words: arbuscular mycorrhiza, competitive asymmetry, micropropagation.

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Tammi, Hanna, Sari Timonen et Robin Sen. « Spatiotemporal colonization of Scots pine roots by introduced and indigenous ectomycorrhizal fungi in forest humus and nursery Sphagnum peat microcosms ». Canadian Journal of Forest Research 31, n^o 5 (1 mai 2001) : 746–56. http://dx.doi.org/10.1139/x01-011.

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Mycorrhizal and non-mycorrhizal Scots pine (Pinus sylvestris L.) seedling combinations were grown in two-dimensional Perspex® microcosms containing forest humus or nursery Sphagnum peat, without additional fertilization. Spatial and temporal patterns of mycorrhizal fungal colonization of roots were assessed over a 3-month period, through visual morphotyping and polymerase chain reaction assisted rDNA fingerprinting of developed mycorrhizas. Six distinct morphotypes of mycorrhiza developed on non-mycorrhizal seedlings grown in forest humus. Three of the morphotypes (white1-, black-, and brown-type) were, respectively, associated with the fungi Suillus bovinus (L. ex Fr.) O. Kuntze, Cenococcum geophilum Fr., and Thelephora terrestris Ehrh.:Fr. (= Tomentella radiosa (P. Karst.) Rick). A fourth pink-type morphotype displayed features indicating root colonization by Tomentellopsis submollis (Svrcek) Hjortstam, but this could not be confirmed because of a lack of source restriction fragment length polymorphism (RFLP) data. Brown-type mycorrhiza were the first to appear after seedling transplantation and black-type mycorrhizas showed local and dispersed root colonization dynamics. Mycorrhiza development in the unfertilized nursery peat substrate was restricted to a single unidentifiable brown-type morphotype, which appeared after 44 days. Rapid colonization of adjacent non-mycorrhizal seedlings by Tomentellopsis submollis, but not S. bovinus, was detected following the introduction of preinoculated seedlings into the humus or peat microcosms. The biomass of seedlings grown in nursery peat, regardless of mycorrhizal status, was significantly lower than that of mycorrhizal seedlings grown in humus. These findings support and extend previous bait seedling studies, as they provide a primary in situ characterization of distinct root colonization strategies of mycorrhizal species in forest humus and nursery peat.

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Perry, D. A., R. Molina et M. P. Amaranthus. « Mycorrhizae, mycorrhizospheres, and reforestation : current knowledge and research needs ». Canadian Journal of Forest Research 17, n^o 8 (1 août 1987) : 929–40. http://dx.doi.org/10.1139/x87-145.

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Although not a panacea, management of mycorrhizae and associated organisms is an important reforestation aid. Its three major components are protection of the indigenous soil community and evaluation of inoculation needs, integration of inoculation programs into existing reforestation technology, and research. Clear-cutting frequently results in reduced mycorrhizae formation, particularly when reforestation is delayed and no other host plants are present to maintain fungal populations. Implications of such reductions for reforestation vary with environmental factors and tree species. Adequate mycorrhiza formation is especially critical for ectomycorrhizal trees growing on poor soils or in environments where seedlings must establish quickly to survive. It may also be important where early successional, noncrop plants do not support the same mycobiont as the crop. In such circumstances, a self-reinforcing trend may develop, with poor mycorrhiza formation reducing seedling survival and poor tree stocking leading to further loss of mycorrhizal inocula. Inoculating nursery seedlings with mycobionts holds promise for improving outplanting performance only if site-adapted fungi are used. A practical alternative is to improve nursery practices to enhance natural populations of mycorrhizal fungi. Seedlings leaving the nursery with diverse mycorrhizae may perform better than those leaving with only one or a few nursery-adapted types. Research is needed in three broad areas: on adaptations of mycorrhizal fungi to particular environmental factors; on interactions between tree seedlings and processes occurring within the sphere of influence of roots (the rhizosphere) or of mycorrhizal roots (the mycorrhizosphere); and on the role of mycorrhizae and associated organisms in ecosystem structure and processes, particularly nutrient cycling, plant-plant interaction, and soil structure.

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Taurinanda, Adventio Purnamadya, et Dina Rotua Valentina Banjarnahor. « Mycorrhiza Diversity in Some Intercropping Systems of Potato (Solanum tuberosum L) and Faba Bean (Vicia faba L) ». Jurnal Teknik Pertanian Lampung (Journal of Agricultural Engineering) 12, n^o 2 (15 juin 2023) : 495. http://dx.doi.org/10.23960/jtep-l.v12i2.495-508.

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Arbuscular mycorrhizal fungi (AMF) is the most widely distributed mycorrhizal fungi in the soil and can make a symbiosis with the roots of host plants to form arbuscular mycorrhizal symbionts. Intercropping is a practice of polyculture cropping where two or more plant species are simultaneously cultivated in the same field. The objective of this study was to define the effect of intercropping on the density and diversity of mycorrhizal spores. In this study, potatoes and faba beans, both of which have the ability to symbiosis with mycorrhizae, were intercropped. A randomized group design with 5 planting system treatments was employed in this study with 5 replications. The results concluded that density of mycorrhizal spores in the intercropping planting pattern was not statistically different from the density of mycorrhiza in the monoculture cultivation pattern. The types of mycorrhiza found included the genus of Glomus, Funneliformis, Scutellospora, Cetraspora, Septoglomus, and Entrophospora Keywords: pH; Root exudate; Spore density, Spore identification; Spore diversity.

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Moora, Mari, et Martin Zobel. « Can arbuscular mycorrhiza change the effect of root competition between conspecific plants of different ages ? » Canadian Journal of Botany 76, n^o 4 (1 avril 1998) : 613–19. http://dx.doi.org/10.1139/b98-037.

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Seedlings and adults of Hypericum perforatum L., common St. John's wort, were grown together in an experiment of factorial design, where the presence of root competition and arbuscular mycorrhizal inoculation were used as treatments. There was moderate shoot competition, the intensity of which was not manipulated. To check the response of plants to arbuscular mycorrhiza in noncompetitive conditions, adults and seedlings were also grown singly in pots. Single individuals of seedlings and adults responded positively to mycorrhizal inoculation, with the response of seedlings significantly greater. In the competition experiment the positive effect of mycorrhizal colonization on seedling growth vanished, since with root competition, both mycorrhizal and nonmycorrhizal seedlings were of the same size. Without root competition, the shoots of mycorrhizal adults were much larger than of nonmycorrhizal adults, but under root competition the shoot weight did not differ. Arbuscular mycorrhiza increased the biomass differences between competing seedlings and adults. We did not confirm our hypothesis that mycorrhiza makes competition between seedlings and adults more balanced because of the stronger positive response of seedlings to inoculation. The positive effect of arbuscular mycorrhizae on growth vanishes in more crowded conditions. It was concluded that if mycorrhizal inoculation has age-specific positive effect of seedlings in field conditions, it is more probably due to higher tolerance to abiotic stress than due to higher competitive ability of seedlings.Key words: arbuscular mycorrhiza, intraspecific root competition, seedlings, Hypericum perforatum.

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Schroeder-Moreno, Michelle S., et David P. Janos. « Intra- and inter-specific density affects plant growth responses to arbuscular mycorrhizas ». Botany 86, n^o 10 (octobre 2008) : 1180–93. http://dx.doi.org/10.1139/b08-080.

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Arbuscular mycorrhizas can alter competitive interactions between plants that markedly differ in their dependence upon mycorrhizas, but little is known about how mycorrhizas affect intra- and inter-specific competition between similarly dependent plant species. We conducted competition experiments in pots between all pairs of the similarly facultatively mycotrophic crop species, chili ( Capsicum annuum L.), maize ( Zea mays L.), and zucchini ( Cucurbita pepo L.). We used a two-species yield-density model to analyze the separate effects of mycorrhizal inoculation, intra-, and inter-specific density on biomass responses. Mycorrhizas reduced the growth of all three plant species. Intraspecific competition increased the negative effect of mycorrhizas, as did interspecific competition at low intraspecific density. At high intraspecific density, however, interspecific competition improved plant responsiveness to mycorrhizas. Enhancement of plant benefit from mycorrhizas at high interspecific density of competing, weakly mycorrhiza-dependent species may help to explain the evolutionary maintenance of their associations with mycorrhizal fungi, and may be a key to understanding intercrop combinations that exceed the monoculture yields of component species.

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Vidal, M. T., C. Azcón-Aguilar, J. M. Barea et F. Pliego-Alfaro. « Mycorrhizal Inoculation Enhances Growth and Development of Micropropagated Plants of Avocado ». HortScience 27, n^o 7 (juillet 1992) : 785–87. http://dx.doi.org/10.21273/hortsci.27.7.785.

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Micropropagated plantlets of avocado (Persea americana Mill.) exhibit a very slow rate of growth during the acclimatization phase, possibly because mycorrhizae are absent. Inoculation of plantlets with the vesicular-arbuscular mycorrhizal fungus Glomus fasciculatum (Thaxter sensu Gerd) Gerd and Trappe improved formation of a well-developed root system that was converted into a mycorrhizal system. Introduction of the mycorrhizal fungus at the time plantlets were transferred from axenic conditions to ex vitro conditions improved shoot and root growth; enhanced the shoot: root ratio; increased the concentration and/or content of N, P, and K in plant tissues; and helped plants to tolerate environmental stress at transplanting. Inclusion of soil as a component of the potting medium appeared to favor mycorrhiza formation and effectiveness. Thus, mycorrhiza formation seems to be the key factor for subsequent growth and development of micropropagated plants of avocado.

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Unrug, Juliusz, et Katarzyna Turnau. « Mycorrhiza of Dryopteris carthusiana in southern Poland ». Acta Mycologica 34, n^o 2 (20 août 2014) : 305–14. http://dx.doi.org/10.5586/am.1999.020.

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The research on mycorrhiza of Dryopteris carthusiana from natural sites and those contaminated by heavy metals (Niepołomice Forest), both on lowlands and mountainous areas in Poland, was carried out. Mycorrhizal colonization of Arum-type was higher in ferns growing on tree stumps than in specimens developing directly on the soil. Additionally, an increase in mycorrhiza intensity and arbuscular richness with the rising ground humidity was observed. In comparison to natural sites, mycorrhizas from the areas contaminated by heavy metals were much less developed and the roots were often infected by parasites. Two morphotypes of mycorrhizal fungi have been described The most common was a fine endophyte (Glomales).

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Syakur, S., S. Syafruddin et S. Saiful. « Propagation of mycorrhiza as biological fertilizer and its application on patchouli seedling in Andisols Bener Meriah ». IOP Conference Series : Earth and Environmental Science 1297, n^o 1 (1 février 2024) : 012022. http://dx.doi.org/10.1088/1755-1315/1297/1/012022.

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Abstract Mycorrhiza, functioning as a biofertilizer, have the capacity to improve soil fertility, including Andisols which is cultivated by patchouli. This research objective to produce mycorrhizal as a biofertilizer to increase the growth of patchouli. Additionally, the effect of mycorrhizal types on the seedlings of patchouli in Andisols was studied. Propagation mycorrhizae carried out the exploration of mycorrhizae on Andisols Bener Meriah, and the carrier was Glomus mosseae, Gigaspora, and a mixture of Glomus mosseae and Gigaspora sp. and then the mycorrhizal biofertilizer was tested to patchouli seedling. The parameters observed in this study included the colonization of patchouli root, initial soil analysis, and patchouli seedling growth. The output in this study is a product in the form of a local specific strain of Bener Meriah biofertilizer. The results obtained have succeeded in the propagation mycorrhizal biofertilizers with the carrier Glomus mosseae, Gigaspora, and a mixture of Glomus mosseae and Gigaspora sp. The highest 90% mycorrhizal colonization was found in the mixed mycorrhizal carrier Glomus mosseae + Gigaspora sp. The growth of patchouli seedlings increased, and the highest patchouli growth was observed the combination of mycorrhizal Glomus mosseae and Gigaspora sp. application

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Dalpé, Y. « Mycorrhizal fungi biodiversity in Canadian soils ». Canadian Journal of Soil Science 83, Special Issue (1 août 2003) : 321–30. http://dx.doi.org/10.4141/s01-067.

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The term "mycorrhiza" refers to the mutualistic symbiosis between fungi and the roots of a vast majority of vascular plants, distributed over almost any ecosystem. The fungal symbionts, primarily recognized for their beneficial impact on plant growth and plant protection, are integral components of soil ecosystems and as such, play an active role in improving plant productivity and diversity, soil microflora and microfauna diversity, and soil quality. Classified among major groups of true fungi, the study of their biodiversity and distribution has been explored for only a few decades. Major emphasis was first put on the mycorrhizal status of plants, on the evaluation of their benefits to plant growth, on their geographic distribution and soil inventories, and more recently on their relationship to plant diversity and productivity. In the 1950s, Canadian scientists were among world pioneers in the field of mycorrhizae research and they continue to be recognized by the international scientific community. Studies dealing with soil biodiversity of mycorrhizal fungi, including arbuscular, ecto-, ectendo-, ericoid- and orchid mycorrhizae, performed by Canadian researchers are presented here together with strategies and perspectives for a better exploitation of mycorrhizal fungal diversity in ecosystems. Key words: Symbiosis, mycorrhizae, arbuscular mycorrhizal fungi, ectomycorrhizal fungi, biodiversity, plant protection

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Ramakrishnan, K., et G. Bhuvaneswari. « Influence on Different Types of Mycorrhizal Fungi on Crop Productivity in Ecosystem ». International Letters of Natural Sciences 38 (mai 2015) : 9–15. http://dx.doi.org/10.18052/www.scipress.com/ilns.38.9.

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Mycorrhizal fungi greatly enhanced the ability of plants to take up phosphorus and other nutrients those are relatively immobile and exist in low concentration in the soil solution. Fungi can be important in the uptake of other nutrients by the host plant. Mycorrhizae establish symbiotic relationships with plants and play an essential role in plant growth, disease protection, and overall soil quality. Of the seven types of mycorrhizae described in current scientific literature (arbuscular, ecto, ectendo, arbutoid, monotropoid, ericoid and orchidaceous mycorrhizae), the arbuscular and ectomycorrhizae are the most abundant and widespread. This chapter presents an overview of current knowledge of mycorrhizal interactions, processes, and potential benefits to society. The molecular basis of nutrient exchange between arbuscular mycorrhizal (AM) fungi and host plants is presented; the role of AM fungi in disease protection, alleviation of heavy metal stress and increasing grain production. Most land plants form associations with mycorrhizal fungi. Mycorrhizas are mutualistic associations between fungi and plant roots. They are described as symbiotic because the fungus receives photo synthetically derived carbon compounds and the plant has increased access to mineral nutrients and sometimes water.

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Ramakrishnan, K., et G. Bhuvaneswari. « Influence on Different Types of Mycorrhizal Fungi on Crop Productivity in Ecosystem ». International Letters of Natural Sciences 38 (6 mai 2015) : 9–15. http://dx.doi.org/10.56431/p-9pjdc8.

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Mycorrhizal fungi greatly enhanced the ability of plants to take up phosphorus and other nutrients those are relatively immobile and exist in low concentration in the soil solution. Fungi can be important in the uptake of other nutrients by the host plant. Mycorrhizae establish symbiotic relationships with plants and play an essential role in plant growth, disease protection, and overall soil quality. Of the seven types of mycorrhizae described in current scientific literature (arbuscular, ecto, ectendo, arbutoid, monotropoid, ericoid and orchidaceous mycorrhizae), the arbuscular and ectomycorrhizae are the most abundant and widespread. This chapter presents an overview of current knowledge of mycorrhizal interactions, processes, and potential benefits to society. The molecular basis of nutrient exchange between arbuscular mycorrhizal (AM) fungi and host plants is presented; the role of AM fungi in disease protection, alleviation of heavy metal stress and increasing grain production. Most land plants form associations with mycorrhizal fungi. Mycorrhizas are mutualistic associations between fungi and plant roots. They are described as symbiotic because the fungus receives photo synthetically derived carbon compounds and the plant has increased access to mineral nutrients and sometimes water.

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Dwiyani, Rindang, I. Gusti Ngurah Alit Susanta Wirya, I. Gusti Alit Gunadi, Ida Ayu Putri Darmawati, Hestin Yuswanti, Ketut Budi Susrusa et Anak Agung Made Astiningsih. « The Role of Mycorrhizae on the Growth of Banana Planlets of Cultivar Raja (Musa Paradisiaca C.V. Raja) from Bali at Post Acclimatization ». Journal of Tropical Life Science 14, n^o 02 (17 juillet 2024) : 309–18. http://dx.doi.org/10.11594/jtls.14.02.11.

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The effect of inoculation of a combination of the arbuscular mycorrhizal fungus of Glomus and Acaulospora on micropropagated banana plantlets cultivar Raja from Bali during the acclimatization phase was investigated. The experiment was conducted at the Experimental Station of the Faculty of Agriculture, Udayana University, Denpasar, Bali, Indonesia, over the period of March to June 2022. The objective of this research was to evaluate the impact of various doses of mycorrhizae on the growth of tissue culture banana plantlets that had undergone acclimatization for a period of six weeks. A total of five different doses of mycorrhiza were applied to the acclimatized plantlets, namely M0=without mycorrhiza and M5=5g mycorrhizal. kg1, M10=10 g mycorrhiza.kg-1, M15=15 g mycorrhiza.kg-1, M20=20 g mycorrhizal. kg 1. A significant effect was discovered at M15; however, compared to M20, M20 gave better results for root length and fresh weight of the above-ground part, indicating the best dose was 20 g mycorrhiza kg-1. This study concluded that mycorrhiza has a very significant role in supporting the growth of micro-propagated banana plantlets at post-acclimatization. Variables observed, such as the average number of leaves, stem diameter, above-ground plant fresh and dry weight, and root fresh and dry weight, increased with the application of AMF (Glomus and Acaulospora).

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AlZain, Mashail N., Abdulrahman A. AlAtar, Abdulaziz A. Alqarawi, Ramzi A. Mothana, Omar M. Noman, Rashed N. Herqash, Ebtesam S. AlSheddi, Nida N. Farshori et Perwez Alam. « The Influence of Mycorrhizal Fungi on the Accumulation of Sennosides A and B in Senna alexandrina and Senna italica ». Separations 7, n^o 4 (25 novembre 2020) : 65. http://dx.doi.org/10.3390/separations7040065.

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Symbiotic arbuscular mycorrhizal fungi (AMF) play a major role in plant development, growth, and relationships with the environment through a change in the accumulation of secondary metabolites; hence, we planned to investigate AMF’s influence on sennoside A and B accumulation in Senna alexandrina (SA) and Senna italica (SI). Seeds of SA (S. alexandrina free of mycorrhizae) and SI (S. italica free of mycorrhizae) were planted in two types of soils: +mycorrhiza and—mycorrhiza. The plant leaves of SA, SI, S. alexandrina with mycorrhizae (SAM) and S. italica with mycorrhizae (SIM) were collected and extracted (with 85% methanol), and sennoside A and B content was evaluated by the HPLC–UV method. The antioxidant activity of SA, SI, SAM and SIM was evaluated by using 2, 2-diphenyl-1-picrylhydrazyl (DPPH) and 2,2′-azino-bis (3-ethylbenzothiazoline-6-sulfonic acid) (ABTS) methods, while antimicrobial properties were evaluated by the minimum inhibitory concentration method (MIC). The AMF colonization was 85.66% and 85%, respectively, in the roots of SA and SI. The HPLC analysis showed a significant increase in (%) the content of sennoside A/sennoside B by 71.11/88.21, respectively, in SAM and 6.76/36.37 in SIM, which clearly indicated positive AMF effects. The DPPH/ABTS [The half maximal inhibitory concentration (IC50): 235.9/321.5 µg/mL] scavenging activity of SAM was comparatively higher and it also exhibited strong antibacterial action (MIC: 156.25 µg/mL), which supported the increase in sennoside content. This finding may be useful for further investigations of the symbiotic relation of mycorrhizal fungi with other plant species.

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Gianinazzi-Pearson, Vivienne, Armelle Gollotte, Benoit Tisserant, Philipp Franken, Eliane Dumas-Gaudot, Marie-Claude Lemoine, Diederik van Tuinen, Silvio Gianinazzi et Jeanine Lherminier. « Cellular and molecular approaches in the characterization of symbiotic events in functional arbuscular mycorrhizal associations ». Canadian Journal of Botany 73, S1 (31 décembre 1995) : 526–32. http://dx.doi.org/10.1139/b95-292.

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Arbuscular mycorrhizas represent the most widespread, and probably most ancient, type of plant–fungus association in which the large majority of terrestrial plants must have evolved with compatibility systems towards the fungal symbionts. Cellular interactions leading to reciprocal morphofunctional integration between symbionts during mycorrhiza establishment are complex. Some plant genes and cellular events may be shared with nodulation processes, but there is evidence of molecular modifications specific to arbuscular mycorrhiza formation. Plant defence responses, which are normally weakly activated during the symbiotic state, are strongly elicited by arbuscular mycorrhizal fungi in genetically altered, resistant hosts suggesting control over defence gene expression during establishment of a successful symbiosis. Modifications are also induced in the fungal symbionts during colonization of host tissues, with changes in wall metabolism and protein expression. Nothing is known of the genetic make-up of arbuscular mycorrhizal fungi which are recalcitrant to pure culture. Recent cloning of DNA from these fungi opens the possibility of identifying functional genes in order to study their regulation and role in symbiosis establishment. Key words: arbuscular mycorrhiza, reciprocal symbiosis, molecular mechanisms, plant determinants, fungal molecules.

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Vaidya, Geeta Shrestha, et Nabin Bhattarai. « EFFICACY OF INVASIVE GREEN MANURES AND MYCORRHIZA ON GROWTH AND YIELD OF DIFFERENT LEGUMES CROPS AND STUDY THEIR ANTIMICROBIAL PROPERTIES ». Scientific World 12, n^o 12 (6 octobre 2015) : 65–69. http://dx.doi.org/10.3126/sw.v12i12.13600.

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Application of the invasive green manure (locally available Lantana camara, Eupatorium adenophorum) is an essential means to maintain soil fertility, soil structure and stimulate biological activities extensively. In this present study field trial of Lentil and Rajma were conducted in Kosebali Divison of Rampur, Chitwan district. Mycorrhiza was isolated from agricultural soil by sugar decantation method and mass production with the help of onion plant. Leaves of Lantana camara and Eupatorium adenophorum were collected and shed dried and grinded on powdered form. The treatments with green manures and mycorrhizae showed higher yield than the control in case of Lentil field trial. In case of Rajma field trial, length of stems and dry seed formation was higher in Eupatorium adenophorum and followed by Lantana camara, chemical fertilizer, control and mycorrhiza. Mycorrhizal spores were found higher in Lantana camara followed by Eupatorium adenophorum, mycorrhizal, chemical fertilizer and control. The number of mycorrhizal spores was found higher in case of Lantana camara followed by Eupatorium adenophorum, mycorrhiza, compost, chemical fertilizer and control. The percentage of seedless and low seeded pods were found higher on control followed by compost, chemical fertilizer, Lantana camara, Eupatorium adenophorum and mycorrhiza.Scientific World, Vol. 12, No. 12, September 2014, page 65-69

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Adams, Felicity, Paul Reddell, Michael J. Webb et Warren A. Shipton. « Arbuscular mycorrhizas and ectomycorrhizas on Eucalyptus grandis (Myrtaceae) trees and seedlings in native forests of tropical north-eastern Australia ». Australian Journal of Botany 54, n^o 3 (2006) : 271. http://dx.doi.org/10.1071/bt05028.

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Eucalypts have been shown to form both arbuscular mycorrhizas (AM) and ectomycorrhizas (ECM) in glasshouse experiments. Little is known, however, about the relative dominance of these two mycorrhiza types on individual eucalypt species across their natural range. This study examined mycorrhizal colonisation levels of Eucalyptus grandis Hill ex Maiden roots at 29 sites representing a broad range of wet sclerophyll forest types in the wet tropics of north-eastern Australia. Adult E. grandis trees sampled in situ were invariably heavily ectomycorrhizal, with 76–100% fine root length colonised (% RLC). There were comparatively low levels of AM, with typically less than 10% RLC. Seedling E. grandis grown in intact soil cores from the field sites under glasshouse conditions had lower total levels of mycorrhiza formation compared with adult trees, with more variable ECM formation (10–95% RLC) and more extensive AM formation (10–40% RLC). There were no apparent trends in mycorrhiza formation across different soil parent material, rainfall or vegetation categories used. The current research suggests that arbuscular mycorrhizas are more prominent on seedlings, whereas ectomycorrhizas predominate in adult trees of E. grandis. Possible reasons for these differences and a comparison with other studies of eucalypt mycorrhizas under natural conditions are presented.

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Pacheco Flores de Valgaz, Angela, Milton Barcos-Arias, Jaime Naranjo-Morán, Denisse Peña Tapia et Rebeca Moreira-Gómez. « Ericaceous Plants : A Review for the Bioprospecting of Ericoid Mycorrhizae from Ecuador ». Diversity 14, n^o 8 (12 août 2022) : 648. http://dx.doi.org/10.3390/d14080648.

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Ericaceae are a group of plants with biotechnological and commercial importance. These plants establish symbiotic associations with a wide group of mycorrhizal fungi. National and global studies have focused on two of them: arbuscular endomycorrhizae and ectomycorrhizae. The most recent type of mycorrhiza recorded is the cavendishioid ectendomycorrhizae. The cavendishioid is one of the least-studied and understood mycorrhizae, along with monotropoid and arbutoid mycorrhizae. Among the potentialities of these ectendomycorrhizae are the alleviation of environmental stress, the facilitation of establishment, survival, the ability to form dual mycorrhizae, and their importance as a fundamental biological element of plant ecological successions. However, the factors that influence or correlate with the diversity of some of these fungal guilds, as well as the functional significance of their associations, are still unknown. The present review focuses on ericoid mycorrhiza from Ecuador in order to promote their study and thus take advantage of the benefits that they provide to endemic species and those of commercial interest. This material contributes significantly to reducing research gaps and channeling applied projects in the biological sciences.

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Linderman, R. G., et E. A. Davis. « Arbuscular Mycorrhiza and Growth Responses of Several Ornamental Plants Grown in Soilless Peat-based Medium Amended with Coconut Dust (Coir) ». HortTechnology 13, n^o 3 (janvier 2003) : 482–87. http://dx.doi.org/10.21273/horttech.13.3.0482.

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Coconut fiber dust (coir) is being used as a peat substitute or amendment to potting mixes with varied results. However, its microbial composition and compatibility with beneficial microbes that might be added to growth media in the nursery, such as mycorrhizal fungi, has not been determined. In this study, coir was amended to a peat-based medium (15%, 30%, 45%, and 60% by volume) to determine its effects on growth of several ornamental plants and on the formation and function of the arbuscular mycorrhizal (AM) fungus Glomus intraradices. Mycorrhizae formed as well, and usually better, in all the coir-amended peat treatments as in peat alone. The magnitude of growth enhancement due to mycorrhizae was small for the plants tested in these media compared to that which usually occurs in soil-based media. In this experiment, plant growth responses appeared to be independent of level of mycorrhizal colonization and were plant species dependent. Consistent growth enhancement from mycorrhizae only occurred with marigold (Tagetes patula). With germander (Teucrium fruticans), growth was depressed with mycorrhizal inoculation in the medium composed of 60% coir. Growth of lavender (Lavandula augustifolia) was depressed in all coir-amended media, with or without AM inoculation, compared to the nonamended control. These results confirm previous reports of varied response of plant species to coir, and indicate the lack of any detrimental effects of coir on mycorrhiza formation.

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Gagnon, J., C. G. Langlois et J. A. Fortin. « Growth of containerized jack pine seedlings inoculated with different ectomycorrhizal fungi under a controlled fertilization schedule ». Canadian Journal of Forest Research 17, n^o 8 (1 août 1987) : 840–45. http://dx.doi.org/10.1139/x87-133.

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Containerized jack pine (Pinusbanksiana Lamb.) seedlings were grown in a peat moss – vermiculite substrate and inoculated at sowing with pure cultures of three ectomycorrhizal fungi. After 18 weeks of growth in the greenhouse, seedlings inoculated with Laccariabicolor had 97% of their short roots mycorrhizal, while those inoculated with Hebelomacylindrosporum had 36% of their rootlets mycorrhizal. No mycorrhizae were obtained with Rhizopogon sp. After both 12 and 18 weeks of growth with the fertilization schedule used, seedlings colonized with L. bicolor and H. cylindrosporum were significantly smaller than those inoculated with Rhizopogon sp. or control seedlings. After 18 weeks of growth, the available nitrogen (N) content of the substrate was considerably greater with L. bicolor inoculated seedlings than with control seedlings, whereas the available phosphorus (P) content of the substrate was the same for these two treatments. Also, after 18 weeks, seedlings mycorrhizal with L. bicolour had a. greater concentration (%) of N and P in their tissues than control seedlings; however, they contained fewer milligrams of N and P than control seedlings. From our results on substrate fertility of mycorrhizal seedlings, we state that it is possible to induce mycorrhiza formation of jack pine seedlings with L. bicolor when substrate fertility in available N and P is less than or equal to 39 and 60 ppm, respectively, and that it is possible to maintain L. bicolor mycorrhizae when N and P fertility is less than or equal to 24 and 28 ppm, respectively. From analysis of tissue nutrient content in mycorrhizal seedlings, it appears that the appropriate N and P concentrations to maintain mycorrhiza formation of jack pine seedlings with L. bicolor are less than or equal to 1.6 and 0.2%, respectively.

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Sukri, M. Zayin, Refa Firgiyanto, Vega Kartika Sari et Basuki Basuki. « Kombinasi Pupuk Kandang Sapi, Asam Humat Dan Mikoriza Terhadap Infeksi Akar Bermikoriza Tanaman Cabai Dan Ketersediaan Unsur Hara Tanah Udipsamments ». Jurnal Penelitian Pertanian Terapan 19, n^o 2 (13 janvier 2020) : 142. http://dx.doi.org/10.25181/jppt.v19i2.1450.

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This research is an experimental study that aims to examine the combination of cattle manure, humic acid, and mycorrhizae to increase mycorrhizal infections in the roots of chili plants in the Udipsamments soil in Puger District, Jember Regency, which was carried out in May-November 2018. The research design used was a factorial complete randomized block design with 3 factors that were repeated 3 times. The first factor is cattle manure (0 tons / ha, 10 tons / ha, 20 tons / ha), the second factor is humic acid (0 ppm / ha, 200 ppm / ha), and the third factor is mycorrhiza (0 g / plant , 30 g / plant). The results showed that the combination of cattle manure, humic acid, and mycorrhiza inoculants to chili plant roots was able to increase the root mycorrhizal infection of chili plants and increase the nutrients available in the soil by 191.84% for nitrogen and 392.93% for phosphorus.

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Jones, Melanie D., et Sally E. Smith. « Exploring functional definitions of mycorrhizas : Are mycorrhizas always mutualisms ? » Canadian Journal of Botany 82, n^o 8 (1 août 2004) : 1089–109. http://dx.doi.org/10.1139/b04-110.

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Mycorrhizas are considered to be classic mutualisms. Here, we define mutualism as a reciprocal increase in fitness of the symbionts, and we review the evidence for mycorrhizal mutualism at the community, whole-plant, and cellular scales. It is difficult to use results of most mycorrhizal studies because (i) fungal contribution to nutrient uptake is not accurately estimated, (ii) increased growth is not necessarily correlated with increased plant fecundity or survival, especially in communities, and (iii) benefits that occur only at certain times of year, or under specific extreme conditions, may not be detected. To produce the nonmycorrhizal controls required to study mutualism in the field, soil microflora and fauna must be severely perturbed; therefore, it is virtually impossible to evaluate effects of mycorrhizas on plant fitness under realistic conditions. Using the evidence available, we conclude that mycorrhizas can occupy various positions along the continuum from parasitism to mutualism, depending on the specific plant and fungal genotypes and their abiotic and biotic environments. Although we discuss the possibility of defining mycorrhizas by some physiological characteristic, we conclude that mycorrhizas should be defined on a structural or developmental basis and that any requirement to demonstrate mutualism be eliminated.Key words: mycorrhiza, mutualism, parasitism, physiology, fitness, community.

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Novita, Aisar, Miller Saputra Hasibuan, Efrida Lubis, Anggria Lestami et Bunga Raya Ketaren. « Response of Growth and Production of Butternut Squash (Cucurbita moschata) to Application of Mycorrhizae and Quail Manure ». Agrotechnology Research Journal 7, n^o 1 (30 juin 2023) : 8–15. http://dx.doi.org/10.20961/agrotechresj.v7i1.71784.

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The demand for butternut squash which continues to increase every year makes farmers try to increase their production, one of which is by applying biological and organic fertilizers. This study aims to determine the response of growth and production of butternut squash to the application of mycorrhiza and quail manure. This study used a randomized block design with 2 factors and 3 replications. The first factor was the application of mycorrhiza which consisted of 3 levels, namely: 0, 2.5, and 5 g/plant, while the second factor was quail manure which consisted of 4 levels, namely: 0, 1, 2 and 3 kg/plot. The results showed that the application of mycorrhizae had a significant effect on fruit length and fruit weight. The application of quail manure had a significant effect on increasing fruit weight. The interaction of mycorrhizae and quail manure did not significantly affect all observed parameters. Although it had no significant effect, the application of mycorrhiza and quail fertilizer was proven to increase the growth and production of butternut squash compared to the control (without the application of mycorrhiza and quail manure). The combination of mycorrhizal 2.5 g/plant and quail manure 1 kg/plot could increase butternut squash production.

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Geil, R. D., et F. C. Guinel. « Effects of elevated substrateethylene on colonization of leek (Allium porrum) by the arbuscular mycorrhizal fungus Glomus aggregatum ». Canadian Journal of Botany 80, n^o 2 (1 février 2002) : 114–19. http://dx.doi.org/10.1139/b01-135.

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There are very few studies of hormonal regulation of arbuscular mycorrhiza formation that include the gaseous hormone ethylene. Ethylene is considered inhibitory to the formation of arbuscular mycorrhizae; however, very low concentrations may promote their formation. We used an improved method of exogenous ethylene application to determine whether ethylene concentration dependent changes in colonization occur in the leek (Allium porrum L. cv. Giant Musselburgh) Glomus aggregatum Schenck & Smith emend. Koske system. This improved method allowed for a continuous flow of constant concentration of the gas to be applied to a substrate. The 0.6 µL/L substrateethylene treatment reduced both root and leaf length and resulted in significantly lower arbuscular colonization compared with controls, whereas the 0.3 µL/L treatment reduced root length only and did not significantly affect colonization levels. Despite continuous application of exogenous ethylene, the amount of ethylene detected in inoculated substrates was reduced to near zero 20 days after inoculation. This decrease may be either due to an increased capacity for ethylene oxidation by arbuscular mycorrhizal roots or because arbuscular mycorrhizal fungi (or other microbes in the pot-cultured inoculum) are capable of metabolizing ethylene. The present study highlights the need for investigations into arbuscular mycorrhizal fungal physiology and the mechanisms by which ethylene regulates arbuscular mycorrhiza formation.Key words: arbuscular mycorrhiza, colonization, exogenous ethylene, monocot.

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Doré, Jeanne, Roland Marmeisse, Jean-Philippe Combier et Gilles Gay. « A Fungal Conserved Gene from the Basidiomycete Hebeloma cylindrosporum Is Essential for Efficient Ectomycorrhiza Formation ». Molecular Plant-Microbe Interactions® 27, n^o 10 (octobre 2014) : 1059–69. http://dx.doi.org/10.1094/mpmi-03-14-0087-r.

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We used Agrobacterium-mediated insertional mutagenesis to identify genes in the ectomycorrhizal fungus Hebeloma cylindrosporum that are essential for efficient mycorrhiza formation. One of the mutants presented a dramatically reduced ability to form ectomycorrhizas when grown in the presence of Pinus pinaster. It failed to form mycorrhizas in the presence of glucose at 0.5 g liter–1, a condition favorable for mycorrhiza formation by the wild-type strain. However, it formed few mycorrhizas when glucose was replaced by fructose or when glucose concentration was increased to 1 g liter–1. Scanning electron microscopy examination of these mycorrhizas revealed that this mutant was unable to differentiate true fungal sheath and Hartig net. Molecular analyses showed that the single-copy disrupting T-DNA was integrated 6,884 bp downstream from the start codon, of an open reading frame potentially encoding a 3,096-amino-acid-long protein. This gene, which we named HcMycE1, has orthologs in numerous fungi as well as different other eukaryotic microorganisms. RNAi inactivation of HcMycE1 in the wild-type strain also led to a mycorrhizal defect, demonstrating that the nonmycorrhizal phenotype of the mutant was due to mutagenic T-DNA integration in HcMycE1. In the wild-type strain colonizing P. pinaster roots, HcMycE1 was transiently upregulated before symbiotic structure differentiation. Together with the inability of the mutant to differentiate these structures, this suggests that HcMycE1 plays a crucial role upstream of the fungal sheath and Hartig net differentiation. This study provides the first characterization of a fungal mutant altered in mycorrhizal ability.

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Berliner, Ruhama, et John G. Torrey. « Studies on mycorrhizal associations in Harvard Forest, Massachusetts ». Canadian Journal of Botany 67, n^o 8 (1 août 1989) : 2245–51. http://dx.doi.org/10.1139/b89-287.

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An estimate was made of the abundance of different types of mycorrhizal associations in two plant communities of conifers and hardwoods in the Harvard Forest. Lists of plant species, the coverage of their foliage in the canopy and understorey layers, and the types of mycorrhizal associations for 45 species common in these communities are presented. Of the species examined, 91 % were mycorrhizal, representing most of the known major types, viz. ectomycorrhiza, vesicular–arbuscular mycorrhiza (VAM), ericoid, and monotropoid mycorrhiza. Of the 45 species studied, 22% of the species showed ectomycorrhizal, and 71 % VAM associations. A direct spore count was a more reliable method than the most probable number method for determining VAM occurrence in the soil. Spore numbers ranged from 4.4 to 11.8 spores/g oven-dried soil. In conifer stands, ectomycorrhizae were most common, although VAM were also observed in the conifer species. In hardwood stands, VAM were more frequent than in conifer stands, but mycorrhizae were heterogeneous and included a good proportion of the ericoid type. Ectomycorrhizae were more common in communities of low diversity; VAM occurred more frequently in communities of high plant species diversity.

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Cavagnaro, Timothy R., Shannon K. Sokolow et Louise E. Jackson. « Mycorrhizal effects on growth and nutrition of tomato under elevated atmospheric carbon dioxide ». Functional Plant Biology 34, n^o 8 (2007) : 730. http://dx.doi.org/10.1071/fp06340.

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Arbuscular mycorrhizas are predicted to be important in defining plant responses to elevated atmospheric CO2 concentrations. A mycorrhiza-defective tomato (Solanum lycopersicum L.) mutant with reduced mycorrhizal colonisation (rmc) and its mycorrhizal wild-type progenitor (76R MYC+) were grown under ambient and elevated atmospheric CO2 concentrations (eCO2) in a controlled environment chamber-based pot study. Plant growth, nutrient contents and mycorrhizal colonisation were measured four times over a 72-day period. The 76R MYC+ plants generally had higher concentrations of P, N and Zn than their rmc counterparts. Consistent with earlier studies, mycorrhizal colonisation was not affected by eCO2. Growth of the two genotypes was very similar under ambient CO2 conditions. Under eCO2 the mycorrhizal plants initially had higher biomass, but after 72 days, biomass was lower than for rmc plants, suggesting that in this pot study the costs of maintaining carbon inputs to the fungal symbiont outweighed the benefits with time.

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Rieger, Andreas, Martin Guttenberger et Rüdiger Hampp. « Soluble Carbohydrates in Mycorrhized and Non-Mycorrhized Fine Roots of Spruce Seedlings ». Zeitschrift für Naturforschung C 47, n^o 3-4 (1 avril 1992) : 201–4. http://dx.doi.org/10.1515/znc-1992-3-406.

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Abstract We present results on the compartmentation of carbohydrates such as sucrose, glucose, fructose, and mannose in different parts of an ectomycorrhiza established between Picea abies and Amanita muscaria and compare it with non-mycorrhized fine roots. Lyophilized mycorrhizas and fine roots (< 2 mm length) were dissected into about 0.5 mm thick slices which represent 4 zones of different physiological functions. The total amount of the analyzed carbohydrates was about 30% higher in non-mycorrhized (n-myc) compared to mycorrhized (myc) fine roots, with sucrose being the dominating sugar in both root types. A longitudinal distinction of sucrose pools showed lowest levels in the middle parts of a mycorrhiza, which represent areas of most intense symbiotic interaction. Fine roots without fungal infection did not show longitudinal variations in sugar content.

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Snetselaar, Karen M., et Kenneth D. Whitney. « Fungal calcium oxalate in mycorrhizae of Monotropa uniflora ». Canadian Journal of Botany 68, n^o 3 (1 mars 1990) : 533–43. http://dx.doi.org/10.1139/b90-074.

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Monotropa uniflora is an achlorophyllous angiosperm that is obligately mycotrophic. The "monotropoid" mycorrhizae it forms resemble ectomycorrhizae but are distinguished by elaborations of the epidermal cell walls that surround intruding fungal hyphae. Monotropoid mycorrhizae collected from blooming plants in late summer contained calcium oxalate crystals between mantle hyphae. The crystals appeared to form in association with hyphal walls and grew into a matrix outside the hyphae. Production of calcium oxalate by M. uniflora's mycobiont seems to be a coordinated metabolic process rather than a random precipitation event. The significance of calcium translocation and isolation as calcium oxalate to this mycorrhizal fungus is unclear, but the presence of extensive crystal deposits during and after flowering of the host plant suggests a possible link with the nutrient transfer occurring at that time. Mycorrhizal regulation of calcium may affect the availability of mineral nutrients to the associated Monotropa plants. Key words: Monotropa uniflora, mycorrhiza, calcium oxalate, ectomycorrhiza.

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Münzenberger, B., T. Otter, A. Polle et D. Wüstrich. « Peroxidase and laccase activities in mycorrhizal and non-mycorrhizal fine roots of Norway spruce (Picea abies) and larch (Larix decidua) ». Canadian Journal of Botany 75, n^o 6 (1 juin 1997) : 932–38. http://dx.doi.org/10.1139/b97-103.

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Peroxidase (EC 1.11.1.7) and laccase (EC 1.10.3.1) activities were determined in mycorrhizal and non-mycorrhizal main and lateral roots of Picea abies (L.) Karst. (Norway spruce) and Larix decidua Mill, (larch) and in mycelia of the ectomycorrhizal fungus Laccaria amethystea (Bull.) Murr. grown under axenic conditions. Peroxidase isozyme patterns were identified after isoelectric focussing. In both tree species, mycorrhizae contained the lowest, and laterals of noninoculated plants the highest, peroxidase activities. Pure mycelia of Laccaria amethystea contained considerable laccase activity but no peroxidase activity. Laccase activity was barely detected in noninoculated laterals of spruce, but was present in noninoculated laterals of larch and in main roots of Norway spruce and larch. Highest laccase activities were found in mycorrhizae of both tree species, indicating that most of the activity was derived from the fungus. Laterals of Norway spruce contained eight, and those of larch five, acidic peroxidase isozymes. In mycorrhizae of Norway spruce and larch, specific peroxidase isozymes with pI values of 4.5 and 6.2 and 5.8 and 6.0, respectively, were almost completely suppressed. The specific suppression of peroxidase suggests that the fungal symbiont is able to modify the host defence response in mature mycorrhizae. Key words: defence mechanism, laccase, mycorrhiza, peroxidase (isozymes), plant–fungus interaction.

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Korhonen, Anna, Tarja Lehto, Jaakko Heinonen et Tapani Repo. « Whole-plant frost hardiness of mycorrhizal (Hebeloma sp. or Suillus luteus) and non-mycorrhizal Scots pine seedlings ». Tree Physiology 39, n^o 6 (29 octobre 2018) : 951–60. http://dx.doi.org/10.1093/treephys/tpy105.

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Abstract Ectomycorrhizal trees are common in the cold regions of the world, yet the role of the mycorrhizal symbiosis in plant cold tolerance is poorly known. Moreover, the standard methods for testing plant frost hardiness may not be adequate for roots and mycorrhizas. The aims of this study were to compare the frost hardiness of mycorrhizal and non-mycorrhizal Scots pine (Pinus sylvestris L.) seedlings and to test the use of reverse-flow root hydraulic conductance (Kr) measurement for root frost hardiness determination. Mycorrhizal (Hebeloma sp. or Suillus luteus) and non-mycorrhizal seedlings were grown in controlled-environment chambers for 13 weeks. After this, half of the plants were allotted to a non-hardening treatment (long day and high temperature, same as during the preceding growing season) and the other half to a hardening (short day and low temperature) ‘autumn’ treatment for 4 weeks. The intact seedlings were exposed to whole-plant freezing tests and the needle frost hardiness was measured by relative electrolyte leakage (REL) method. The seedlings were grown for three more weeks for visual damage assessment and Kr measurements using a high-pressure flow meter (HPFM). Mycorrhizas did not affect the frost hardiness of seedlings in either hardening treatment. The effect of the hardening treatment on frost hardiness was shown by REL and visual assessment of the aboveground parts as well as Kr of roots. Non-mycorrhizal plants were larger than mycorrhizal ones while nitrogen and phosphorus contents (per unit dry mass) were similar in all mycorrhiza treatments. In plants with no frost exposure, the non-mycorrhizal treatment had higher Kr. There was no mycorrhizal effect on plant frost hardiness when nutritional effects were excluded. Further studies are needed on the role of mycorrhizas especially in the recovery of growth and nutrient uptake in cold soils in the spring. The HPFM is useful novel method for assessment of root damage.

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MOYERSOEN, BERNARD, IAN J. ALEXANDER et ALASTAIR H. FITTER. « Phosphorus nutrition of ectomycorrhizal and arbuscular mycorrhizal tree seedlings from a lowland tropical rain forest in Korup National Park, Cameroon ». Journal of Tropical Ecology 14, n^o 1 (janvier 1998) : 47–61. http://dx.doi.org/10.1017/s0266467498000054.

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The relationship between mycorrhizal colonisation and phosphorus acquired by seedlings of the arbuscular mycorrhizal tree Oubanguia alata Bak f. (Scytopetalaceae) and the ectomycorrhizal tree Tetraberlinia moreliana Aubr. (Caesalpiniodeae) was evaluated at low and high inorganic phosphorus availability. AM colonisation was positively correlated with phosphorus uptake by O. alata at low, but not at high phosphorus availability. Seedlings growth was positively related to arbuscular mycorrhizal colonisation at both low and high phosphorus availability, suggesting that growth promotion by arbuscular mycorrhizas is not simply related to an increase of phosphorus uptake. In contrast, phosphorus uptake by T. moreliana was correlated with EM colonisation at both low and high phosphorus availability, but there was no relationship between growth and ectomycorrhizal colonisation. Promotion of phosphorus uptake by arbuscular mycorrhizas and ectomycorrhizas at low phosphorus availability is consistent with the co-occurrence of the two types of mycorrhiza in tropical rain forests where available soil phosphorus is low. However, ectomycorrhizal colonisation may also be of advantage where inputs of phosphorus rich litter raise the phosphorus status of the soil, as seen in the groves of ectomycorrhizal trees in Korup National Park, and may be one of the factors reinforcing local dominance by these trees.

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Mizan Maulana, Vinny Pratiwi, Rika Yusli Harta, Zaitun Ritaqwin et Darmadi Erwin Harahap. « Produksi Tanaman Okra (Abelmoschus esculentus L. Moench) Akibat Aplikasi Mikoriza dan Pupuk Rock Phosphat pada Cekaman Salin ». Jurnal Ilmu Pertanian Indonesia 29, n^o 4 (2 juillet 2024) : 533–40. http://dx.doi.org/10.18343/jipi.29.4.533.

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Okra (Abelmochus esculentus L. Moench) has a fairly high nutritional content; every 10 gr of young okra fruit contains 33 calories, 7 gs of carbohydrates, 3.2 gs of fiber, and 81 mg calcium. Okra fruit contains a lot of mucilage due to its high fiber content. This study aimed to determine the effect of rock phosphate doses and types of mycorrhizae and the interaction between these two factors on the growth and yield of okra in saline soil. The research results showed that the dose of mycorrhiza had a very significant effect on the growth and yield of okra plants. The best dose of mycorrhiza was 10 g/plant, and the best type was Acauluspora. It showed that a dose of 10 g/plant with the Acauluspora type on okra yields on Ultiisol soil had given the best results in the vegetative phase, which could be seen in plant height parameters 15 and 30 ADP. The dose of rock phosphate is 150 g, which can be seen in the 300 g planting parameter and in almost all the observed variables. Hyphae in the soil can spread widely, which helps absorb more water. The best yields of okra plants were found by applying a mycorrhizal dose of 10 g on fruit weight variables of plants' mycorrhizal colonization on vase vegetative roots and mycorrhizal colonization on plant roots in the generative phase. Keywords: biological agents, fertilizer, mycorrhiza, rock phosphate

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Ullah, Fazal, Habib Ullah, Muhammad Ishfaq, Syeda Leeda Gul, Tanveer Kumar et Zhifang Li. « Improvement of Nutritional Quality of Tomato Fruit with Funneliformis mosseae Inoculation under Greenhouse Conditions ». Horticulturae 9, n^o 4 (30 mars 2023) : 448. http://dx.doi.org/10.3390/horticulturae9040448.

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Long-term soil mining with extensive cultivation practices and traditional breeding methods have declined the flavor and nutritional value of tomatoes. Apart from important mineral nutrients (i.e., nitrogen, phosphorus, and potassium), fungi known as arbuscular mycorrhizae (AM) can considerably improve the quality of agricultural production through higher phosphate uptake. Using hydroponically cultured commercially available tomato cultivars, we investigated the possible effects of mycorrhizae in improving the nutritional quality of tomato fruit. Funneliformis mosseae (syn. Glomus mosseae)-inoculated tomato plants were grown on a 1:1 mixture of peat and vermiculite, and different phosphorus levels were applied. RNAseq and metabolites were studied to confirm the relative gene expression and metabolites in fruit tissues. The results showed that AM inoculation with low phosphorus can significantly improve important fruit-quality traits such as free amino acids, lycopene (47.9%), and β-carotene (29.6%) without compromising the yield. Further, differentially expressed genes (DEGs) were identified by comparing the nutritional and ripening potential of fruits produced by mycorrhizal and non-mycorrhizal plants. Notably, carotenoids and sugars (BRIX values) were found to be higher in mycorrhized plants in contrast to non-mycorrhized plants. Therefore, the current study suggests mycorrhization as a promising approach for the production of high-quality tomato fruit for human consumption.

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KASURINEN, A., T. HOLOPAINEN et S. ANTTONEN. « Mycorrhizal colonisation of highbush blueberry and its native relatives in central Finland ». Agricultural and Food Science 10, n^o 2 (2 janvier 2001) : 113–19. http://dx.doi.org/10.23986/afsci.5683.

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Transmission electromicroscopy, trypan blue staining in combination with stereomicroscope analysis and biochemical ergosterol assay were used to study the mycorrhizal symbionts in wild bilberry (Vaccinium myrtillus), bog whortleberry (Vaccinium uliginosum) and highbush blueberry (Vaccinium corymbosum) roots. TEM-analysis showed that in all species ericoid mycorrhizas formed hyphae coil inside the epidermal root cells. In stereomicroscopic viewing the highest mycorrhizal colonisation was observed in the roots of wild bilberries (51%), whereas according to the ergosterol assay the highest total fungal biomass of roots was found in bog whortleberries (209 mg g-1 of root d. wt). Both ergosterol and microscopical method showed that the mycorrhizal associations in blueberry cultivars and their wild relatives growing on natural soil medium are frequent, although ericoid mycorrhiza formation of highbush blueberries was somewhat weaker than that of wild bilberries and bog whortleberries.

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Pons, Caroline, et Caroline Müller. « Impacts of Drought Stress and Mycorrhizal Inoculation on the Performance of Two Spring Wheat Cultivars ». Plants 11, n^o 17 (24 août 2022) : 2187. http://dx.doi.org/10.3390/plants11172187.

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Cereal production is becoming challenging, given ongoing climate change. Arbuscular mycorrhizal fungi (AMF) are discussed to mitigate effects of drought for plants and enhance nutrient uptake. Thus, we investigated the impacts of drought and mycorrhiza on the growth and allocation patterns of two cultivars of spring wheat (Triticum aestivum). Plants were grown under three irrigation regimes (well-watered, continuous or pulsed drought) and in three substrates (absence or presence of one or three AMF species). Applied water use efficiency (WUEapplied), harvest index (HI) and contents of carbon (C), nitrogen (N) and phosphorous (P) were determined when grains were watery ripe. When grains were hard, again, WUEapplied, HI and the thousand-kernel weight were measured. The WUEapplied and HI were lowest in plants under pulsed drought stress at the second harvest, while the thousand-kernel weight was lower in mycorrhized compared to non-mycorrhized plants. The C/N ratio dropped with increasing drought stress but was enhanced by mycorrhiza, while the P content was surprisingly unaffected by mycorrhiza. The total root length colonization was higher in substrates with the AMF mix, but overall, fungal presence could not alleviate the effects of drought. Our results highlight the complexity of responses to challenging environments in this highly domesticated species.

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Sarsekova, D., B. Osserkhan, T. Abzhanov et A. Nurlabi. « Mycorrhiza Formation in Pinus Sylvestris and Picea Obovata Seedlings in Forest Nurseries in Kazakhstan ». Acta Botanica Hungarica 63, n^o 3-4 (21 octobre 2021) : 427–46. http://dx.doi.org/10.1556/034.63.2021.3-4.12.

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This work presents research materials, the purpose of which is to grow seedlings of coniferous trees in the open field using artificial substrates of mycorrhizal macromycetes in forest nurseries of Central, North and Northeast Kazakhstan. The success of mycorrhiza formation in seedlings Pinus sylvestris and Picea obovata from forest nurseries of Akmola and Karaganda regions, and the survival rate of seedlings from forest nurseries of Akmola, Karaganda and Pavlodar regions of Kazakhstan are analysed. In the future, we want to expand the range of studied species and compare artificially mycorrhized seedlings with naturally mycorrhized species from natural forests. If we compare the survival rate of seedlings in nurseries, the highest in P. sylvestris seedlings in Shaldai is about 78%, low in Novodolenskoe, about 27%, and for P. obovata, on average, 66%. In the future, we want to expand the range of studied species and compare artificially mycorrhized seedlings with naturally mycorrhized species from natural forests.

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Frymark-Szymkowiak, Anna, Magdalena Kulczyk-Skrzeszewska et Jolanta Tyburska-Woś. « Seasonal Dynamics in Mycorrhizal Colonization and Fine Root Features of the White Poplar (Populus alba L.) in Natural Temperate Riverside Forests with Two Contrasting Soils ». Forests 15, n^o 1 (28 décembre 2023) : 64. http://dx.doi.org/10.3390/f15010064.

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Fine roots are the most dynamic and physiologically active components of belowground tree organs. However, much remains unknown regarding the changes in fine root morphological characteristics during mycorrhizal colonization, especially in natural sites. The aim of this study was to analyze seasonal heterogeneity in fine roots and the mycorrhizal colonization of mature white poplar (Populus alba L.) trees under different soil conditions. Two floodplain forests were selected in Central Europe (Poland), which differed in soil moisture and structure. Fine roots were sampled during one growing season from the upper soil layer. Poplars were characterized by dual mycorrhizal colonization on one root system. It was, therefore, possible to investigate the contribution of two mycorrhizal types (arbuscular mycorrhiza—AM; and ectomycorrhiza—ECM) in response to different habitat conditions. The season was shown to be significant for all fine root features, as well as the degree of mycorrhizal colonization. Roots were better adapted to a drier habitat with a greater proportion of sand, mainly due to a reduction in the fine root diameter (FRD), while other root characteristics did not differ significantly. The degree of mycorrhizal colonization (RLC) and the proportion of arbuscular mycorrhizal structures (AM) were significantly and negatively correlated with the soil water content. A mutual competition between arbuscular mycorrhizas and ectomycorrhizas for poplar roots was also observed, particularly with respect to the season, site, and soil moisture. Changing environmental conditions (especially soil moisture) contribute not only to the morphological and functional changes of fine roots but also to changes in the proportion of arbuscular mycorrhiza and ectomycorrhiza. Understanding the mechanisms of adaptation of tree roots to changing environmental conditions is especially important in the context of climate change.

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Syafruddin, S., S. Syakur, F. A. Munandar, N. Rafiqa et N. K. Hatami. « Study of influence of genus and mycorrhizae dosage on the growth of patchouli (Pogostemon cablin Benth.) in the seedling and post-seedling phases in inceptisols soil ». IOP Conference Series : Earth and Environmental Science 1297, n^o 1 (1 février 2024) : 012068. http://dx.doi.org/10.1088/1755-1315/1297/1/012068.

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Abstract Pogostemon cablin Benth. (Lamiaceae) is the source of patchouli essential oil, which is an important and unique commodity in the fragrance industry. Patchouli plants are also cultivated on inceptisol with low nutrient content and CEC exchange. The use of mycorrhiza is expected to increase nutrient absorption, and plant performance of patchouli. This research is divided into 2 phases, namely the seedling and post-seedling phases. This study applies a Randomized Block Design (RBD) with 3 x 3 factorial and 3 replications. The observed factors were genus mycorrhizae; namely M1 (Glomus mossae), M2 (Gigaspora cf gigantea), and M3 (Glomus mossae + Gigaspora cf gigantea); and mycorrhizal dose; namely D1 (5 g), D2 (10 g), and D3 (15 g). Data were subjected to analysis of ANOVA using SPSS ver. 21.0 with Tukey’s test. In the seedling and post-seedling phases, the initiation of Glomus mossae had a significant impact on the growth of patchouli and mycorrhiza colonization. The best mycorrhizae dose is 5g which has a significant effect on the number of leaves at 135 and 150 DAP. The interaction of Glomus mossae at a dose of 10 g mycorrhizae has a significant effect on the stem diameter 135 and 150 DAP.

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DERE, Sultan, Ayse COBAN, Yelderem AKHOUNDNEJAD, Suleyman OZSOY et Hayriye Yildiz DASGAN. « Use of Mycorrhiza to Reduce Mineral Fertilizers in Soilless Melon (Cucumis melo L.) Cultivation ». Notulae Botanicae Horti Agrobotanici Cluj-Napoca 47, n^o 4 (20 décembre 2019) : 1331–36. http://dx.doi.org/10.15835/nbha47411738.

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Intensive use of mineral fertilizers in soilless growing systems can have adverse effects on the environment and human health and could be economically expensive. Aim of this study was whether it can be reduced mineral nutrients in soilless grown melon by using mycorrhizae inoculation. The experiment has been carried out in the early spring growing period in a greenhouse in the Mediterranean climate. The eight treatments have been applied: (1) 100% Full nutrition (control), (2) 100% Full nutrition+mycorrhiza, (3) 80% nutrition, (4) 80% nutrition+mycorrhiza (5) 60% nutrition (6) 60% nutrition+mycorrhiza (7) 40% nutrition, (8) 40% nutrition+mycorrhiza. Effects of mycorrhiza on melon plant growth, yield, fruit quality, and leaf nutrient concentrations were investigated. Arbuscular mycorrhizal fungi colonization is accompanied by plant growth increases in reduced nutrient levels. The mycorrhiza inoculation had a significant enhancing effect on total yield in soilless grown melon plants. The highest increasing effect on melon yield was observed in the “80% nutrient+mycorrhiza”, and AM- inoculated plants produced 49.5% higher melon yield (12.4 kg m-2) than that of control plants without mycorrhizae (8.3 k gm-2). AM-inoculation was also able to establish an improvement in Brix and EC of melon fruit. In the nutrient contents of leaves, there were slight increases in AM-inoculated plants, except P. The P content was significantly increased in AM-inoculated 80% nutrient plants as comparison to that of its control. ********* In press - Online First. Article has been peer reviewed, accepted for publication and published online without pagination. It will receive pagination when the issue will be ready for publishing as a complete number (Volume 47, Issue 4, 2019). The article is searchable and citable by Digital Object Identifier (DOI). DOI link will become active after the article will be included in the complete issue. *********

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Dexheimer, Jean, Joëlle Gerard, Jean-Pierre Leduc et Gérard Chevalier. « Étude ultrastructurale comparée des associations symbiotiques mycorhiziennes Helianthemum salicifolium – Terfezia claveryi et Helianthemum salicifolium – Terfezia leptoderma ». Canadian Journal of Botany 63, n^o 3 (1 mars 1985) : 582–91. http://dx.doi.org/10.1139/b85-073.

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The authors have studied the ultrastructural organization of two synthetic mycorrhizas between Helianthemum salicifolium (L.) Mill. (Cistaceae) and Terfezia claveryi Chat. or Terfezia leptoderma Tul. (Ascomycetes, Terfeziaceae). With Terfezia claveryi an endomycorrhiza is formed with many of the hyphae hugging the inside surface of the cell wall. The cytoplasmic volume of the mycorrhizal cells is not significantly increased. With Terfezia leptoderma an ectomycorrhiza without a sheath is formed, but there is a typical Hartig net. These two types of mycorrhiza constitute examples of biotrophism.

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Thurner, Melanie A., Silvia Caldararu, Jan Engel, Anja Rammig et Sönke Zaehle. « Modelled forest ecosystem carbon–nitrogen dynamics with integrated mycorrhizal processes under elevated CO₂ ». Biogeosciences 21, n^o 6 (19 mars 2024) : 1391–410. http://dx.doi.org/10.5194/bg-21-1391-2024.

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Abstract. Almost 95 % of all terrestrial plant species form symbioses with mycorrhizal fungi that mediate plant–soil interactions: mycorrhizae facilitate plant nitrogen (N) acquisition and are, therefore, vital for plant growth, but they also build a pathway for plant-assimilated carbon (C) into the rhizosphere. Therefore, mycorrhizae likely play an important role in shaping the response of ecosystems to environmental changes such as rising atmospheric carbon dioxide (CO2) concentrations, which can increase plant N demand and the transfer of plant C assimilation to the soil. While the importance of mycorrhizal fungi is widely recognised, they are rarely represented in current terrestrial biosphere models (TBMs) explicitly. Here, we present a novel, dynamic plant–mycorrhiza–soil model as part of the QUINCY (QUantifying Interactions between terrestrial Nutrient CYcles and the climate system) TBM. This new model is based on mycorrhizal functional types that either actively mine soil organic matter (SOM) for N or enhance soil microbial activity through increased transfer of labile C into the rhizosphere, thereby (passively) priming SOM decomposition. Using the Duke Free-Air CO2 Enrichment (FACE) experiment, we show that mycorrhizal fungi can have important effects on projected SOM turnover and plant nutrition under ambient as well as elevated-CO2 treatments. Specifically, we find that including enhanced active mining of SOM for N in the model allows one to more closely match the observations with respect to observed decadal responses of plant growth, plant N acquisition and soil C dynamics to elevated CO2, whereas a simple enhancement of SOM turnover by increased below-ground C transfer of mycorrhizae is unable to replicate the observed responses. We provide an extensive parameter uncertainty study to investigate the robustness of our findings with respect to model parameters that cannot readily be constrained by observations. Our study points to the importance of implementing mycorrhizal functionalities in TBMs as well as to further observational needs to better constrain mycorrhizal models and to close the existing major knowledge gaps in actual mycorrhizal functioning.

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Perotto, Silvia, Renato Peretto, Antonella Faccio, Andrea Schubert, Paola Bonfante et Ajit Varma. « Ericoid mycorrhizal fungi : cellular and molecular bases of their interactions with the host plant ». Canadian Journal of Botany 73, S1 (31 décembre 1995) : 557–68. http://dx.doi.org/10.1139/b95-296.

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A number of soil-borne fungi are able to form typical ericoid mycorrhizae with plants belonging to Ericales. Together with Hymenoscyphus ericae, the first isolate from roots of ericaceous plants, other fungal species belonging to the genus Oidiodendron and many sterile mycelia have been recognized as mycorrhizal by several authors. A high genetic diversity was even found when a population of ericoid mycorrhizal fungi isolated from a single plant of Calluna vulgaris was analysed with morphological and molecular techniques. Ericoid fungi have a relevant saprotrophic potential, as they can degrade several organic polymers present in the soil matrices. Different cell wall degrading enzymes, which are part of this arsenal and are produced in vitro by several ericoid fungi, have been investigated biochemically. Immunocytochemical studies on the production of pectin degrading enzymes during the infection process of host and non-host plants suggest that regulation mechanisms for the production of cell wall degrading enzymes in vivo may be a crucial step for the establishment of successful mycorrhiza with host plants. Key words: ericoid mycorrhizae, cell wall degrading enzymes, polygalacturonase, DNA-RAPD techniques.

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Kottke, Ingrid, Juan Pablo Suárez, Paulo Herrera, Dario Cruz, Robert Bauer, Ingeborg Haug et Sigisfredo Garnica. « Atractiellomycetes belonging to the ‘rust’ lineage (Pucciniomycotina) form mycorrhizae with terrestrial and epiphytic neotropical orchids ». Proceedings of the Royal Society B : Biological Sciences 277, n^o 1685 (9 décembre 2009) : 1289–98. http://dx.doi.org/10.1098/rspb.2009.1884.

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Distinctive groups of fungi are involved in the diverse mycorrhizal associations of land plants. All previously known mycorrhiza-forming Basidiomycota associated with trees, ericads, liverworts or orchids are hosted in Agaricomycetes, Agaricomycotina. Here we demonstrate for the first time that Atractiellomycetes, members of the ‘rust’ lineage (Pucciniomycotina), are mycobionts of orchids. The mycobionts of 103 terrestrial and epiphytic orchid individuals, sampled in the tropical mountain rainforest of Southern Ecuador, were identified by sequencing the whole ITS1-5.8S-ITS2 region and part of 28S rDNA. Mycorrhizae of 13 orchid individuals were investigated by transmission electron microscopy. Simple septal pores and symplechosomes in the hyphal coils of mycorrhizae from four orchid individuals indicated members of Atractiellomycetes. Molecular phylogeny of sequences from mycobionts of 32 orchid individuals out of 103 samples confirmed Atractiellomycetes and the placement in Pucciniomycotina, previously known to comprise only parasitic and saprophytic fungi. Thus, our finding reveals these fungi, frequently associated to neotropical orchids, as the most basal living basidiomycetes involved in mycorrhizal associations of land plants.

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Gomes, Bárbara, Fábio Castro, Rita Santos, Patrícia Figueiredo, Márcia Silva, Maria Vidal, Inês Ferreira, João Nunes, Helena Machado et Filomena Gomes. « Effect of Quercetin on Mycorrhizal Synthesis between Tuberborchii and Arbutusunedo L. In Vitro Plants ». Microbiology Research 12, n^o 1 (23 février 2021) : 69–81. http://dx.doi.org/10.3390/microbiolres12010007.

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Arbutus unedo L. is a Mediterranean species used for fruit production; it is tolerant to drought and shows regeneration ability following forest fires. Mycorrhizal plants with Tuber borchii add resilience and value. This study aims to test the effect of quercetin on mycorrhizal synthesis between T. borchii and A. unedo. Two genotypes selected for fruit production and hydric stress tolerance, were micropropagated for mycorrhizal synthesis, accomplished during ex vitro rooting in perlite, using lyophilized spores of T. borchii suspended in culture media with different quercetin levels (0–10 µM). Six months after inoculation, plants were transferred to pots and maintained in nursery. Ten and 12 months after inoculation, roots were morphological examined and molecularly characterized using ITS1-5.8SITS2 rDNA region and specific primers. Results showed that mycorrhizae establishment was dependent on studied factors (genotype, quercetin level, and culture medium) and their interaction (genotype X culture medium). Quercetin levels up to 2.0 µM favored mycorrhizae establishment and plant growth, although levels superior to 4 µM showed a toxic effect. Quercetin showed to be an efficient factor on inducing mycorrhiza thriving independent of the genotype. Morphological observations and molecular analysis confirmed the permanence of the fungus association 10 and 12 months after inoculation.

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Rosnina, Rosnina. « The Functions of Biochar and Arbuscular Mycorrhizal Fungi to Increasing the Yield of Glutinous corn on sub-optimal land in a sustainability ». JERAMI : Indonesian Journal of Crop Science 5, n^o 1 (31 août 2022) : 28–33. http://dx.doi.org/10.25077/jijcs.5.1.28-33.2022.

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This study aims to determine the role of biochar and mycorrhizal fungi in increasing soil fertility Inceptisols as suboptimal soil, which are poor in nutrients, low in carbon, and phosphorus, are suitable for planting of purple pulut corn (Zea mays ceratina Kulesh). This study used a randomized block design (RAK) with a factorial pattern of 3 replications, namely the dose of biochar (B) 0 t/h, 2 t/h, 4 t/h, and mycorrhizae (M) with a dose of 0 t/h, 0.2 t/h, 0.4 t/h. The data obtained were further tested with Duncan's multiple range test at a level of 5%. The application of biochar and mycorrhizae affected the number of leaves, days of flowering for males and females, and rows of This study aims to determine the role of rice husk biochar and mycorrhizal fungi in increasing soil fertility. Inceptisols, which are poor in nutrients, low in carbon, and phosphorus, are suitable for planting. There is an interaction in the administration of biochar 2 t/h + mycorrhiza 0.2 t/h on rows per row of purple pulut corn cobs. The application of biochar and mycorrhizae can overcome land infertility and provide the nutrients suitable for crops for supporting sustainable agriculture.

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Miller, J. Creighton, Sriyani Rajapakse et Randall K. Garber. « Vesicular-Arbuscular Mycorrhizae in Vegetable Crops ». HortScience 21, n^o 4 (août 1986) : 974–84. http://dx.doi.org/10.21273/hortsci.21.4.974.

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Abstract Mycorrhiza refers to a mutualistic, symbiotic relationship formed between fungi (Gr. mukes) and living roots (Gr. rhiza) of higher plants. These associations are prevalent among most plant species and have been observed in most vegetables except the Cruciferae and Chenopodiaceae. In fact, some vegetables do not appear to grow or develop normally without mycorrhizae. In addition to their wide distribution in the plant kingdom, these nonpathogenic relationships are geographically ubiquitous. Thus, the mycorrhizal condition is the rule, as both host plant and fungus specificity is minimal and usually not observed.

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Miller, R. M., B. A. D. Hetrick et G. W. T. Wilson. « Mycorrhizal fungi affect root stele tissue in grasses ». Canadian Journal of Botany 75, n^o 10 (1 octobre 1997) : 1778–84. http://dx.doi.org/10.1139/b97-892.

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Although arbuscular mycorrhizal symbiosis was initially believed to have little or no impact on root morphology, we now recognize that subtle changes do occur and that these changes may be of considerable consequence to host growth and nutrition, as well as functional growth strategy. In examining the stele and root diameters of C3 and C4 grasses, C4 grasses were demonstrated to have a significantly larger proportion of their fibrous roots occupied by stele tissue than do C3 grasses. In fact, functional growth strategy (C3 versus C4) was observed to be a relatively good predictor of stele area. Mycorrhizal fungi also influenced the amount of stele tissue, but the effect was not the same for both C3 and C4 grasses. The stele area of all C4 grasses except for Sorghastrum nutans was greater in the presence of mycorrhizal colonization. Among the C3 grasses, only Bromus inermis showed a significant increase, although Elymus cinereus and Lolium perenne displayed significant decreases in response to arbuscular mycorrhizal colonization. Changes in the stele area of the plant species were closely related to their responsiveness to mycorrhizal symbiosis and might in part explain both beneficial and detrimental responses of plants to mycorrhizae. An increase in stele circumference induced by mycorrhizae would allow for greater uptake and passage of water and nutrients to the vascular cylinder, and growth depressions could be a direct outcome of reduced stele circumference. Thus, differences in stele circumference represent a possible mechanism for mycorrhizal impacts on host plants. These findings indicate that structural differences among grasses are related to different functional capabilities and further emphasize the need for better integration of comparative anatomy and morphology procedures in the study of mycorrhizal symbiosis. Key words: stele, root anatomy, mycorrhizal dependency, functional growth strategy, mycorrhiza, C3 and C4 grasses.

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