Articles de revues : « Mycorrhizal fungi »

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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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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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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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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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Shamsudin, Nor Amirah, Jaya Seelan Sathiya Seelan, Jualang Azlan Gansau et Nor Azizun Rusdi. « A review : Molecular identification of orchid mycorrhiza ». Advances in Horticultural Science 38, n^o 1 (4 avril 2024) : 97–116. http://dx.doi.org/10.36253/ahsc-14952.

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Orchids are a diverse and widespread family of flowering plants, with over 25,000 known species and more than 100,000 hybrids and cultivars. Orchids are characterised by their often showy and highly specialised flowers and have unique and intricate floral. Orchids are known to be highly dependent on their mycorrhizal fungi for nutrient uptake, especially during the early stages of their development. Orchid seeds lack the endosperm present in most other seeds, which means they cannot germinate without a source of nutrition. The relationship between orchids and mycorrhiza is known as orchid mycorrhizae or orchid mycorrhiza. In orchid mycorrhiza, the orchid plant forms a mutualistic relationship with certain species of fungi that are able to penetrate the orchid’s roots and colonise its tissues to provides the orchid with essential nutrients. Orchid mycorrhizal fungi are often highly specific, meaning that they can only form partnerships with certain orchid species, and vice versa. The importance of mycorrhizal fungi in the orchid life cycle is crucial from both evolutionary and ecological standpoints. Therefore, it is essential to acquire a thorough comprehension of this relationship and develop methodologies for isolating, identifying, and preserving significant fungal strains that are associated with different orchid species. In recent years, there has been a considerable increase in research concentration on mycorrhizal interactions in orchids. However, certain inquiries remain unresolved pertaining to the fungal communities associated with orchids as well as the divergences notices across different species and geographical locales. The present paper provides a through, and extensive analysis of the fungal life associated with orchids. This article presents a succinct overview of the molecular techniques utilised by researchers globally to isolate and identify peloton-forming fungi in both temperate terrestrial and tropical orchids. The review begins by proving a concise introduction to the background material regarding the wide range of fungal species that are linked with orchids. It then proceeds to explores the topic of orchid mycorrhizal fungi (OMF) and orchid non-mycorrhizal fungi (ONF). The subsequent analysis explores the crucial function that orchid mycorrhizal fungi play in the processes of seed germination and development. Moreover, the study elaborates on the methodologies utilised for isolating fungi, extracting fungal DNA, selecting primers, amplifying DNA and subsequent analysis sequence data. This article considers several molecular identification approaches that are used in studying orchid endophytic mycorrhizal. Using molecular approaches, orchid mycorrhizal can be further explored and identified.

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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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Liu, Jin, Yang Xu, Yan-Ji Si, Bin-Qi Li, Peng Chen, Ling-Ling Wu, Pu Guo et Rui-Qing Ji. « The Diverse Mycorrizal Morphology of Rhododendron dauricum, the Fungal Communities Structure and Dynamics from the Mycorrhizosphere ». Journal of Fungi 10, n^o 1 (14 janvier 2024) : 65. http://dx.doi.org/10.3390/jof10010065.

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It is generally believed that mycorrhiza is a microecosystem composed of mycorrhizal fungi, host plants and other microscopic organisms. The mycorrhiza of Rhododendron dauricum is more complex and the diverse morphology of our investigated results displays both typical ericoid mycorrhizal characteristics and ectomycorrhizal traits. The characteristics of ectendoomycorrhiza, where mycelial invade from the outside into the root cells, have also been observed. In order to further clarify the mycorrhizal fungi members and other fungal communities of R. dauricum mycorrhiza, and explore the effects of vegetation and soil biological factors on their community structure, we selected two woodlands in the northeast of China as samples—one is a mixed forest of R. dauricum and Quercus mongolica, and the other a mixed forest of R. dauricum, Q. mongolica, and Pinus densiflor. The sampling time was during the local growing season, from June to September. High-throughput sequencing yielded a total of 3020 fungal amplicon sequence variants (ASVs), which were based on sequencing of the internal transcribed spacer ribosomal RNA (ITS rRNA) via the Illumina NovaSeq platform. In the different habitats of R. dauricum, there are differences in the diversity of fungi obtained from mycorrhizal niches, and specifically the mycorrhizal fungal community structure in the complex vegetation of mixed forests, where R. dauricum is found, exhibits greater stability, with relatively minor changes over time. Soil fungi are identified as the primary source of fungi within the mycorrhizal niche, and the abundance of mycorrhizal fungi from mycorrhizal niches in R. dauricum is significantly influenced by soil pH, organic matter, and available nitrogen. The relationship between soil fungi and mycorrhizal fungi from mycorrhizal niches is simultaneously found to be intricate, while the genus Hydnellum emerges as a central genus among mycorrhizal fungi from mycorrhizal niches. However, there is currently a substantial gap in the foundational research of this genus, including the fact that mycorrhizal fungi from mycorrhizal niches have, compared to fungi present in the soil, proven to be more sensitive to changes in soil moisture.

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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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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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Phavaphutanon, Lop, et Fred T. Davies. « 435 PB 206 EFFECT OF MYCORRHIZAL FUNGI AND PHOSPHORUS ON GROWTH AND NUTRIENT UPTAKE OF NEEM TREE SEEDLINGS (AZADIRACHTA INDICA A. JUSS) ». HortScience 29, n^o 5 (mai 1994) : 493e—493. http://dx.doi.org/10.21273/hortsci.29.5.493e.

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Growth and nutrient content of neem tree seedlings (Azadirachta indica A. Juss) were studied in response to the mycorrhial fungi Glomus intraradices Schenck & Smith and Long Ashton Nutrient Solution (LANS) modified to supply phosphorus (P) at 0.65 and 1.30 mM P. Three months after inoculation, an extensive mycorrhizal colonization was observed in mycorrhizal plants at both P levels. Shoot growth of mycorrhizal plants was similar at both P levels while the growth of nonmycorrhizal plants increased with increasing P supply. Mycorrhizal plants had greater leaf area, shoot dry weight and root to shoot ratio than nonmycorrhizal plants at the same P level. The length of nonsuberized roots increased with increasing P supply regardless of mycorrhizal colonization while the length of suberized roots was significantly increased by mycorrhiza. Mycorrhiza altered dry mass partitioning to root systems resulting in greater length and dry weight of suberized roots in mycorrhizal plants. Mycorrhiza also improved nitrogen, phosphorus, calcium and sulfur uptake but did not affect micronutrient uptake, except for enhancing boron.

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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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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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Plenchette, C., C. Clermont-Dauphin, J. M. Meynard et J. A. Fortin. « Managing arbuscular mycorrhizal fungi in cropping systems ». Canadian Journal of Plant Science 85, n^o 1 (1 janvier 2005) : 31–40. http://dx.doi.org/10.4141/p03-159.

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Market globalization, demographic pressure, and environmental degradation have led us to reconsider many of our current agricultural systems. The heavy use of chemical inputs, including fertilizers and pesticides, has resulted in pollution, decreased biodiversity in intensively-farmed regions, degradation of fragile agro-ecosystems, and prohibitive costs for many farmers. Low input sustainable cropping systems should replace conventional agriculture, but this requires a more comprehensive understanding of the biological interactions within agro-ecosystems. Mycorrhizal fungi appear to be the most important telluric organisms to consider. Mycorrhizae, which result from a symbiosis between these fungi and plant roots, are directly involved in plant mineral nutrition, the control of plant pathogens, and drought tolerance. Most horticultural and crop plants are symbiotic with arbuscular mycorrhizal fungi. Mycorrhizal literature is abundant, showing that stimulation of plant growth can be mainly attributed to improved phosphorous nutrition. Although the mycorrhizal potential of its symbiosis to improve crop production is widely recognized, it is not implemented in agricultural systems. There is an urgent need to improve and widely apply analytical methods to evaluate characteristics such as, relative field mycorrhizal dependency, soil mycorrhizal infectivity, and mycorrhizal receptivity of soil. Decreased use of fertilizers, pesticides, and tillage will favour arbuscular mycorrhizal fungi. However, shifting from one system to a more sustainable one is not easy since all components of the cropping system are closely linked. Different cases, from actual agricultural practices in different countries, are analyzed to highlight situations in which mycorrhizae might or might not play a role in developing more sustainable agriculture. Key words: Cropping systems, mycorrhizae, sustainability, technical itineraries, rotation

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Monreal, Marcia, S. M. Berch et Mary Berbee. « Molecular diversity of ericoid mycorrhizal fungi ». Canadian Journal of Botany 77, n^o 11 (30 janvier 2000) : 1580–94. http://dx.doi.org/10.1139/b99-107.

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Using restriction fragment length polymorphism (RFLP) patterns from two ribosomal internal transcribed spacers (ITS) and DNA sequences from ITS2, we characterized ericoid mycorrhizal fungal isolates from culture collections.With a synoptic key to RFLP patterns, we divided 34 mycorrhizal or root-associated isolates into 16 groups. RFLP patterns were identical when fungal specific primers were used to amplify DNA from pure fungal cultures and in vitro mycorrhizae. Sequence analysis clustered 23 of 24 mycorrhizal isolates into two larger groups: the Oidiodendron group and the Hymenoscyphus group. The Oidiodendron group included genetically uniform, conidiating fungi. The Hymenoscyphus group encompassed more diversity and included other discomycetes (Leotiales) as well as sterile, unidentifiable mycorrhizal isolates from four RFLP groups. Results from our field site on Vancouver Island, British Columbia, Canada, suggest that several ericoid mycorrhizal fungi can coexist in a single root of Gaultheria shallon Pursh and that our molecular data base is not yet complete. From sixty 3-mm root sections, we cultured four genetically different fungi that formed mycorrhizae in resynthesis experiments and sequence analysis showed that one of these differed from all previously known ericoid mycorrhizal fungi.

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Rimington, William R., Silvia Pressel, Jeffrey G. Duckett, Katie J. Field, David J. Read et Martin I. Bidartondo. « Ancient plants with ancient fungi : liverworts associate with early-diverging arbuscular mycorrhizal fungi ». Proceedings of the Royal Society B : Biological Sciences 285, n^o 1888 (10 octobre 2018) : 20181600. http://dx.doi.org/10.1098/rspb.2018.1600.

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Arbuscular mycorrhizas are widespread in land plants including liverworts, some of the closest living relatives of the first plants to colonize land 500 million years ago (MYA). Previous investigations reported near-exclusive colonization of liverworts by the most recently evolved arbuscular mycorrhizal fungi, the Glomeraceae, indicating a recent acquisition from flowering plants at odds with the widely held notion that arbuscular mycorrhizal-like associations in liverworts represent the ancestral symbiotic condition in land plants. We performed an analysis of symbiotic fungi in 674 globally collected liverworts using molecular phylogenetics and electron microscopy. Here, we show every order of arbuscular mycorrhizal fungi colonizes early-diverging liverworts, with non-Glomeraceae being at least 10 times more common than in flowering plants. Arbuscular mycorrhizal fungi in liverworts and other ancient plant lineages (hornworts, lycopods, and ferns) were delimited into 58 taxa and 36 singletons, of which at least 43 are novel and specific to liverworts. The discovery that early plant lineages are colonized by early-diverging fungi supports the hypothesis that arbuscular mycorrhizas are an ancestral symbiosis for all land plants.

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Walker, Christopher. « Sitka spruce mycorrhizas ». Proceedings of the Royal Society of Edinburgh. Section B. Biological Sciences 93, n^o 1-2 (1987) : 117–29. http://dx.doi.org/10.1017/s0269727000006333.

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SynopsisRelatively little research has been done on mycorrhizas of Sitka spruce, although greenhouse studies have confirmed that its growth can be improved by the introduction of mycorrhizal fungi. Work in nurseries is difficult under British conditions and it probably will be necessary to disinfest soil in seedbeds before mycorrhizal treatment can be applied. Results from forest trials show that inoculation with selected mycorrhizal fungi can give significant early growth effects, though how long these will persist is unknown. In such work, careful attention must be given to selection of controls. Features covered in this review include a discussion of fungi mycorrhizal with Sitka spruce, identification of mycorrhizas, nutrient uptake, and growth enhancement of seedlings and transplants.

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Rahmaniah, Rahmaniah, et Roswita Oesman. « SERAPAN FOSFOR TANAMAN TERHADAP PEMBERIAN MIKORIZA ARBUSKULA DI BEBERAPA JENIS RUMPUT TERHADAP DERAJAT MIKORIZA ». ZIRAA'AH MAJALAH ILMIAH PERTANIAN 48, n^o 1 (21 janvier 2023) : 115. http://dx.doi.org/10.31602/zmip.v48i1.9193.

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It is hoped that mycorrhiza will increase plant P uptake, and the degree of infection (%) of roots in ultisol soil and the application of arbuscular mycorrhizal fungi to various animal feeds is to determine the effect of mycorrhizal and phosphorus (P) uptake on plants so that the degree of mycorrhizal and phosphorus (P) absorption by plants is affected. . This research was conducted from March 2022 to October 2022 on the land of the Faculty of Agriculture, University of Community Development. This design uses a completely randomized design consisting of two factors. The first factor was the type of grass used consisting of Paspalum guenarum (P1), Paspalum notatum (P2), Brachiaria ruziziensis (P3), Brachiaria humidicola (P4), and Panicum maximum (P5). The second factor was the microsphere level which consisted of 0 gr (M0), 10gr (M1), 20gr (M2) and 30gr (M3). Research Results Mycorrhiza increased plant P uptake, and root infection degree (%) in ultisol soil Arbuscular mycorrhizall Fungi (MVA) administration at a dose of 30 g/polybag showed the best results in response to root infection degree a plant phosphorusrus uptake

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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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Caruso, G., N. A. Golubkina, Т. M. Seredin et V. М. Sellitto. « UTILIZATION OF ARBUSCULAR MYCORRHIZAL FUNGI IN PRODUCTION OF ALLIUM SPECIES ». Vegetable crops of Russia, n^o 3 (25 juillet 2018) : 93–98. http://dx.doi.org/10.18619/2072-9146-2018-3-93-98.

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The fundamental direction of modern agriculture development is elaboration and utilization of technologies that ensure environmental safety, high plant productivity and quality of crop production. In this connection, the issues of optimization of mineral nutrition and water supply, immunity enhancement and protection of plants against various forms of biotic and abiotic stresses without significant environmental stress are of current interest. Normal growth and development of almost all plants on the Earth depends on the presence of mycorrhizal fungi in the soil, which ensure optimal plant nutrition and water supply due to the huge number of hyphae. The review discusses the prospects for the use of arbuscular mycorrhizal fungi in the cultivation of Allium species, as the most responsive plants to the effects of mycorrhizae due to the poorly developed root system that hinders the nutrition of plants. It is noted that utilization of arbuscular mycorrhizal fungi may provide the reduction of the amount of fertilizers, herbicides and insecticides needed for high productivity of crops. The review deals with the peculiarities of symbiotic interrelations of different species of mycorrhizal fungi (pure and mixed cultures, mainly of the genus Glomus) with different Allium species (onion, garlic, shallot, leek, A. roylei, A. fistulosum, A. galanthum). Questions of agricultural crops quality as affected by arbuscular mycorrhizal fungy are discussed. Data on the effect of climatic conditions on the efficiency of arbuscular mycorrhizal fungi utilization in Allium production are discussed. The possibility of increasing the efficiency of biofortification of Allium species with selenium via utilization of arbuscular-mycorrhizal fungi is noted, as well as an increase in the content of biologically active sulfur-containing compounds in garlic. Particular attention is paid to the necessity of the development of arbuscular mycorrhizal fungi preparations in Russia – the country not using this ecologically friendly technology at present.

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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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Ellouze, Walid, Chantal Hamel, R. M. DePauw, R. E. Knox, Richard D. Cuthbert et Asheesh K. Singh. « Potential to breed for mycorrhizal association in durum wheat ». Canadian Journal of Microbiology 62, n^o 3 (mars 2016) : 263–71. http://dx.doi.org/10.1139/cjm-2014-0598.

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The selection of genotypes under high soil fertility may alter the effectiveness of mycorrhizal symbioses naturally forming between crop plants and the mycorrhizal fungi residing in cultivated fields. We tested the hypothesis that the mycorrhizal symbiosis of 5 landraces functions better than the mycorrhizal symbiosis of 27 cultivars of durum wheat that were bred after the development of the fertilizer industry. We examined the development of mycorrhiza and the response of these genotypes to mycorrhiza formation after 4 weeks of growth under high and low soil fertility levels in the greenhouse. The durum wheat genotypes were seeded in an established extraradical hyphal network of Rhizophagus irregularis and in a control soil free of mycorrhizal fungi. The percentage of root length colonized by mycorrhizal fungi was lower in landraces (21%) than in cultivars (27%; P = 0.04) and in the most recent releases (29%; P = 0.02), which were selected under high soil fertility levels. Plant growth response to mycorrhiza varied from –36% to +19%. Overall, durum wheat plant breeding in Canada has increased the mycorrhizal development in wheat grown at a low soil fertility level. However, breeding had inconsistent effects on mycorrhizal development and has led to the production of cultivars with patterns of regulation ranging from unimproved to inefficient.

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Mudge, Kenneth W., Kent S. Diebolt et Thomas H. Whitlow. « Ectomycorrhizal Effect on Host Plant Response to Drought Stress ». Journal of Environmental Horticulture 5, n^o 4 (1 décembre 1987) : 183–87. http://dx.doi.org/10.24266/0738-2898-5.4.183.

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Ectomycorrhizal symbiosis affects the water relations and drought resistance of woody landscape trees and shrubs in the families Pinaceae, Fagaceae, Betulaceae, and others. It has frequently been observed that host plants mycorrhizal with drought-adapted fungi exhibit improved growth and survival during drought and more rapid recovery after rewatering than non-mycorrhizal plants or plants mycorrhizal with fungi not adapted to dry sites. Relatively few studies have addressed the effect of mycorrhizae on the physiological response of host plants to drought stress. It is suggested that some fungi confer drought tolerance to their host, while others confer drought avoidance. Possible mechanisms by which mycorrhizae influence host water relations are discussed.

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SHI, Zhaoyong, Yongming WANG, Shouxia XU, Zhijian LAN, Bede S. MICKAN, Xiaolong ZHANG et Fayuan WANG. « Arbuscular Mycorrhizal Fungi Enhance Plant Diversity, Density and Productivity of Spring Ephemeral Community in Desert Ecosystem ». Notulae Botanicae Horti Agrobotanici Cluj-Napoca 45, n^o 1 (10 juin 2017) : 301–7. http://dx.doi.org/10.15835/nbha45110766.

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Arbuscular mycorrhizal (AM) fungi form intimate associations with the roots of about 85% of all terrestrial plants, and can greatly increase a plant’s uptake of soil nutrients and have been shown to influence plant diversity in several ecosystems. A lot of studies have reported the effect of arbuscular mycorrhizas on plant density, species diversity, richness and productivity in desert herbland in Gurbantonggut desert, China. Here, we conduct a mycorrhizal functional study by suppressing AM fungi by applying the fungicide benomyl as a soil drench in soil cores and field in-situ experiment. The mycorrhiza-responsiveness of the dominant species Erodium oxyrrhynchum is assessed in intact soil cores containing the indigenous AM fungi. The soil-cores experiment displayed E. oxyrrhynchum to have a significant positive shoot and root growth response, and this is in response to the abundance of the indigenous AM fungal colonisation. The field experiment indicates the total aboveground dry biomass is negatively influenced by the suppression of AM fungi, though, no significant effect produced in the dominant and common plant species. The fungal suppression also affected density, species diversity and richness. The density of non-mycorrhizal plant Alyssum linifolium increases significantly in the treatment of suppressed AM fungi. The spore density decreases significantly in benomyl-treated plots. Our results showed that AM fungi were very important in desert ecosystem for the maintaining of plant biodiversity, richness and productivity.

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Westphal, Andreas, Nicole L. Snyder, Lijuan Xing et James J. Camberato. « Effects of Inoculations with Mycorrhizal Fungi of Soilless Potting Mixes During Transplant Production on Watermelon Growth and Early Fruit Yield ». HortScience 43, n^o 2 (avril 2008) : 354–60. http://dx.doi.org/10.21273/hortsci.43.2.354.

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Watermelon, Citrullus lanatus (Thunb.) Matsum. & Nakai, crops are continuously exposed to soilborne diseases. In many areas of the United States, greenhouse-raised watermelon seedlings are transplanted to the field to allow for early crop establishment and early fruit production. This practice can result in weakened root systems, which potentially make the plant prone to premature senescence and reduce crop productivity. Mycorrhizal fungi have been reported to improve plant growth in many crops through enhanced root growth and function. We hypothesized that amending potting mixes with commercial inocula of mycorrhizal fungi during seeding of watermelon in a greenhouse would improve watermelon production when seedlings were transplanted to the field. Colonization of watermelon roots with mycorrhizal fungi from three commercial formulations was compared with the colonization of onion roots to confirm the efficacy of the mycorrhizae. Two inocula of mycorrhizal fungi that resulted in colonization of watermelon roots were tested in the field and glasshouse for their potential to improve watermelon production. MycoApply improved early plant growth in two tests, one under Meloidogyne incognita-infested conditions in loamy sand and another at two phosphorus fertilizer levels (0 or 22 kg·ha−1 P) in a loam soil. Mycor Vam Mini plug improved early fruit yield in soil infested with M. incognita. Application of Myconate (formononetin), a potential enhancer of colonization with mycorrhizae, increased early fruit yield in M. incognita-infested soil. Myconate had positive effects when potting mixes were not amended with inoculum of mycorrhizal fungi, but reduced watermelon growth when mycorrhizal fungi were supplied in the potting mix. In glasshouse tests, inoculation with mycorrhizal fungi did not suppress disease. Mycorrhizal fungi inoculations improved early plant establishment and increased the most valuable early fruit yield under some environmental stress conditions but did not increase total fruit yields.

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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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Quirk, Joe, David J. Beerling, Steve A. Banwart, Gabriella Kakonyi, Maria E. Romero-Gonzalez et Jonathan R. Leake. « Evolution of trees and mycorrhizal fungi intensifies silicate mineral weathering ». Biology Letters 8, n^o 6 (août 2012) : 1006–11. http://dx.doi.org/10.1098/rsbl.2012.0503.

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Forested ecosystems diversified more than 350 Ma to become major engines of continental silicate weathering, regulating the Earth's atmospheric carbon dioxide concentration by driving calcium export into ocean carbonates. Our field experiments with mature trees demonstrate intensification of this weathering engine as tree lineages diversified in concert with their symbiotic mycorrhizal fungi. Preferential hyphal colonization of the calcium silicate-bearing rock, basalt, progressively increased with advancement from arbuscular mycorrhizal (AM) to later, independently evolved ectomycorrhizal (EM) fungi, and from gymnosperm to angiosperm hosts with both fungal groups. This led to ‘trenching’ of silicate mineral surfaces by AM and EM fungi, with EM gymnosperms and angiosperms releasing calcium from basalt at twice the rate of AM gymnosperms. Our findings indicate mycorrhiza-driven weathering may have originated hundreds of millions of years earlier than previously recognized and subsequently intensified with the evolution of trees and mycorrhizas to affect the Earth's long-term CO 2 and climate history.

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Pratama, Aulia Brellian, Wibowo Mangunwardoyo, Nicholas Dwi Chandra, Toga Pangihotan Napitupulu, Idris Idris, Atit Kanti, Azra Zahrah Nadirah Ikhwani, I. Made Sudiana et Ikhsan Guswenrivo. « Influence of AM fungi inoculation on Capsicum annuum L. plant grown in microwave-sterilized media ». E3S Web of Conferences 306 (2021) : 01057. http://dx.doi.org/10.1051/e3sconf/202130601057.

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The presence of arbuscular mycorrhizal in soil may affect growth and yield of chili (Capsicum annuum L.). This experiment was done to know the effect of arbuscular mycorrhizal inoculation on growth of chilli. Microwave soil sterilization was used to reduce the number of microbes in the media, enabling to observe the interaction between chili peppers and arbuscular mycorrhizal fungi. A single culture products (A) and mixed culture products (B) were used as arbuscular mycorrhizal spores. In contrast to product A, the spore counted calculation reported that product B had the most spores, with 51 spores / 50 g soil. The treatment of arbuscular mycorrhizal fungi and microwave sterilization against the height of chili plant had no significant effect, according to a two-factor ANOVA (α: 0.05) analysis of agronomic characteristics. Inoculation of mycorrhizae had a significant effect on chili plant height. Arbuscular mycorrhizal fungi inoculation and microwave sterilization had significant effect on the root length of chili plants. Arbuscular mycorrhizal fungi in single and mixed cultures could colonize roots by forming internal hyphae, vesicles, and spores. The best way to support the growth of chili plants is to use planting media that has not been sterilized and contains mycorrhizal fungi.

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Cardoso Filho, Júlio Alves, Eurico Eduardo Pinto de Lemos, Tania Marta Carvalho dos Santos, Luis Carlos Caetano et Marco Antonio Nogueira. « Mycorrhizal dependency of mangaba tree under increasing phosphorus levels ». Pesquisa Agropecuária Brasileira 43, n^o 7 (juillet 2008) : 887–92. http://dx.doi.org/10.1590/s0100-204x2008000700013.

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The objective of this study was to evaluate the mycorrhizal dependency of mangaba tree (Hancornia speciosa) plantlets, under increasing levels of phosphorus fertilization. The experimental design was completely randomized in a 4×5 factorial arrangement with three mycorrhizal fungi inocula - Gigaspora margarita, Glomus etunicatum, or a pool of native mycorrhizal fungi (Acaulospora longula, Glomus clarum, Gigaspora albida, Paraglomus sp.) -, and a nonmycorrhizal control, in combination with five levels of phosphorus applied to the substrate: 0, 25, 50, 75, and 100 mg kg-1. After 180 days of growth, plantlets with inoculation of native mycorrhizal pool produced more shoot and root dry biomass and had higher shoot phosphorus content and accumulation. The noninoculated control showed the lowest values, independently of the phosphorus level. The highest relative mycorrhizal dependency occurred with the inoculation of native mycorrhizal fungi. Plants with mycorrhizal fungi did not respond to phosphorus addition above 50 mg kg-1. Mangaba tree is highly dependent on mycorrhiza, but the degree of dependency varies according to phosphorus levels and fungal inocula. In general, mangaba tree is more responsive to mycorrhizal fungi inoculation than to phosphorus addition.

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Kumalawati, Zahraeni, Sri Muliani, Asmawati Asmawati, Kafrawi Kafrawi et Yunus Musa. « Exploration of Arbuscular Mycorrhizal Fungi from Sugarcane Rhizosphere in Marginal Land ». PLANTA TROPIKA : Jurnal Agrosains (Journal of Agro Science) 9, n^o 2 (4 septembre 2021) : 126–35. http://dx.doi.org/10.18196/pt.v9i2.4026.

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The exploration of arbuscular mycorrhiza fungi from sugarcane plantation in marginal land in South Sulawesi was carried out to find the source of inoculums showing effective infection. Soil samples were taken from four area with different characteristic of marginal land, namely land with low organic matter content, clay texture, limited irrigation, and undulating land. Mycorrhizae contained in the soil samples were then observed, and the spores obtained were used as the source of isolation by a single spore culture. The mycorrhizal spores were isolated by wet sieving and centrifugation method with 48% sucrose, which were observed under a compound microscope for spore details (100-1000x). Sugarcane root samples were taken to observe mycorrhizal infection in sugarcane root tissue by root staining method. The results of the study showed that the greatest diversity of mycorrhizal genera was found in soil samples of Jambua Block (Glomus, Gigaspora, and Sclerocistis) and AJ-5 Block area (Glomus, Acaulospora, and Sclerocistis). Single-spore isolates obtained were Glomus sp. and Acaulospora sp. Infection test result on four sugarcane varieties commonly grown in Takalar Sugar Factory showed that infectivity of mycorrhizal isolate of Acaulospora sp. was the highest (75%) and significantly different (LSD’test, p 0,05) compared to that of Glomus sp. (66%).

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Danielson, R. M., et S. Visser. « Host response to inoculation and behaviour of introduced and indigenous ectomycorrhizal fungi of jack pine grown on oil-sands tailings ». Canadian Journal of Forest Research 19, n^o 11 (1 novembre 1989) : 1412–21. http://dx.doi.org/10.1139/x89-216.

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Pinusbanksiana Lamb, seedlings were inoculated with nine mycorrhizal fungi and outplanted on an oil-sands containment dyke that had been amended with muskeg peat. After one growing season, E-strain (Complexipes), Hebeloma sp., Thelephoraterrestris Ehrh.:Fr., and Laccariaproximo Boudier each formed mycorrhizae with greater than 40% of the new short roots within 10 cm of the stem. Cenococcumgeophilum Fr., Pisolithustinctorius (Pers.) Coker & Couch, Astraeushygrometricus (Pers.) Morgan, Lactariusparadoxus Beardslee & Burlingham, and Sphaerosporellabrunnea (Alb. & Schw.:Fr.) Svrcek & Kubika each formed mycorrhizae with less than 6% of the short roots on egressed laterals. Of the introduced fungi, only E-strain was present in substantial quantities after 3 years. The quantity of short roots converted to mycorrhizae by indigenous fungi was 4, 33, and 72% after 1, 2, and 3 years, respectively. The change in mycorrhizal fungi appeared to be a noncompetitive replacement process, in which the original short root resident fungus died in the near absence of mycorrhizal fungi. At the end of the 3rd year, the major indigenous fungi converting short roots to mycorrhizae were E-strain, Tuber sp., Suillus-like spp., Myceliumradicisatrovirens Melin, and an unidentified basidiomycete. Inoculation with E-strain and Thelephoraterrestris resulted in a 2- to 3-fold increase in shoot weight after 2 years compared with uninoculated seedlings.

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Al-Khaliel, A. S. « Effect of salinity stress on mycorrhizal association and growth response of peanut infected by Glomus mosseae ». Plant, Soil and Environment 56, No. 7 (14 juillet 2010) : 318–24. http://dx.doi.org/10.17221/204/2009-pse.

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Arbuscular mycorrhiza is a mutualistic association between fungi and higher plants, and play a critical role in nutrient cycling and stress tolerance. However, much less is known about the mycorrhiza-mediated enhancement in growth and salinity tolerance of the peanuts (Arachis hypogaea L.) growing in the arid and semi-arid areas. Therefore, mycorrhizal status of Glomus mosseae in diverse salinity levels on original substrate soil conditions was investigated. Different growth parameters, accumulation of proline content and salt stress tolerance were studied. These investigations indicated that the arbuscular mycorrhizal fungi could improve growth of peanuts under salinity through enhanced nutrient absorption and photosynthesis. Chlorophyll content and leaf water content were increased significantly under salinity stress by the inoculation with mycorrhizal fungi. Tolerance of the plants to salinity was increased and the mycorrhizal association was found highly effective in enhancing peanut growth and establishment in soils under salinity and deficient in phosphorus.

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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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Sinanaj, Besiana, Martin I. Bidartondo, Silvia Pressel et Katie J. Field. « Molecular Evidence of Mucoromycotina “Fine Root Endophyte” Fungi in Agricultural Crops ». Biology and Life Sciences Forum 4, n^o 1 (1 décembre 2020) : 88. http://dx.doi.org/10.3390/iecps2020-08728.

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Over 85% of land plants engage in symbiotic relationships with mycorrhiza-forming soil fungi that colonise their roots. These mycorrhizal symbioses, which involve the exchange of fungal-acquired nutrients and water for photosynthetically fixed plant carbon, are considered a promising nature-based solution to making agricultural practices more sustainable. In order to implement the widespread use of mycorrhizal fungi in agriculture, a more complete awareness of mycorrhizal fungal diversity and range of plant hosts is needed. Mucoromycotina Fine Root Endophytes (MFRE) are a group of mycorrhiza-forming fungi that have recently been shown to be phylogenetically and functionally distinct from arbuscular mycorrhizal fungi (AMF). Here, we provide the first molecular evidence of MFRE colonisation of winter wheat, winter barley, spring wheat and strawberry roots. Fungal symbionts were identified from partial DNA sequences of the 18S ribosomal RNA gene, obtained through a workflow involving molecular cloning and Sanger sequencing. Our findings shed light on the true distribution of plant-MFRE associations and give rise to new questions regarding their functional significance within agricultural plants.

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Liu, A., C. Hamel, S. H. Begna, B. L. Ma et D. L. Smith. « Soil phosphorus depletion capacity of arbuscular mycorrhizae formed by maize hybrids ». Canadian Journal of Soil Science 83, n^o 4 (1 août 2003) : 337–42. http://dx.doi.org/10.4141/s02-037.

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The ability of arbuscular mycorrhizal (AM) fungi to help their host plant absorb soil P is well known, but little attention has been paid to the effect of AM fungi on soil P depletion capacity. A greenhouse experiment was conducted to assess, under different P levels, the effects of mycorrhizae on extractable soil P and P uptake by maize hybrids with contrasting phenotypes. The experiment had three factors, including two mycorrhizal treatments (mycorrhizal and non-mycorrhizal), three P fertilizer rates (0, 40, and 80 mg kg-1) and three maize hybrids [leafy normal stature (LNS), leafy reduced stature (LRS) and a conventional hybrid, Pioneer 3979 (P3979)]. Extractable soil P was determined after 3, 6 and 9 wk of maize growth. Plant biomass, P concentration and total P content were also determined after 9 wk of growth. Fertilization increased soil extractable P, plant biomass, P concentration in plants and total P uptake. In contrast to P3979, the LNS and LRS hybrids had higher biomass and total P content when mycorrhizal. Mycorrhizae had less influence on soil extractable P than on total P uptake by plants. The absence of P fertilization increased the importance of AM fungi for P uptake, which markedly reduced soil extractable P under AM plants during growth. This effect was strongest for LNS, the most mycorrhizae-dependent hybrid, intermediate for LRS, and not significant for the commercial hybrid P3979, which did not respond to AM inoculation. Key words: Arbuscular mycorrhizal fungi, extraradical hyphae, maize hybrid,plant biomass, P uptake, soil extractable P

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Meney, KA, KW Dixon, M. Scheltema et JS Pate. « Occurrence of Vesicular Mycorrhizal Fungi in Dryland Species of Restionaceae and Cyperaceae From South-West Western Australia ». Australian Journal of Botany 41, n^o 6 (1993) : 733. http://dx.doi.org/10.1071/bt9930733.

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Species of Cyperaceae and Restionaceae were examined for presence of vesicular-arbuscular (VA) mycorrhizal fungi in natural habitat in south-west Western Australia. VA mycorrhizal fungi were detected in roots of two species of Cyperaceae (Lepidosperma gracile and Tetraria capillaris), and two species of Restionaceae (Alexgeorgea nitens and Lyginia barbata), all representing the first records for these genera. Results indicated a very short seasonal period of infection, with VA mycorrhizal fungi representing the genera Acaulospora, Glomus, Scutellospora and Gigaspora identified in roots. VA mycorrhizal fungi were prominent from late autumn to early winter (April-June) and in up to 30% of the young, new season's roots as they penetrated the upper 10 cm region of the soil profile. Mycorrhizal infection was not evident during the dry summer months. This study suggests that mycorrhizas may be important for nutrition of these hosts in these environments but their activity is restricted to a brief period of the growing season.

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Sanders, Ian R., Roger T. Koide et Durland L. Shumway. « Mycorrhizal stimulation of plant parasitism ». Canadian Journal of Botany 71, n^o 9 (1 septembre 1993) : 1143–46. http://dx.doi.org/10.1139/b93-134.

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Symbioses, intimate relationships between dissimilar organisms, are most often considered as two-partner interactions. In nature, however, plants can simultaneously interact with a number of symbionts such as the mutualistic mycorrhizal fungi and the parasitic angiosperm dodder. We found that successful shoot parasitism by dodder on plants in a field experiment occurred almost exclusively when the plant roots were colonized by mycorrhizal fungi. Under controlled conditions, life expectancy of dodder was significantly greater on mycorrhizal plants than on nonmycorrhizal plants. Furthermore, colonization of roots by mycorrhizal fungi increased the growth rate of dodder to 3.4 times the rate on nonmycorrhizal plants. The mycorrhizal effect on dodder growth occurred before the haustoria of dodder had succeeded in penetrating the host. These results suggest that colonization by mycorrhizal fungi had systemic effects on their hosts, which altered either the nature of prepenetration dodder signals or the levels of nutrients contained in host stem exudates. These findings could be important for understanding plant–parasite interactions. Key words: Abutilon theophrasti, Cuscuta pentagona, plant parasitism, vesicular–arbuscular mycorrhizas.

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Whipps, John M. « Prospects and limitations for mycorrhizas in biocontrol of root pathogens ». Canadian Journal of Botany 82, n^o 8 (1 août 2004) : 1198–227. http://dx.doi.org/10.1139/b04-082.

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More than 80 disease biocontrol products are on the market worldwide, but none of these contain mycor rhizal fungi. This is despite ample evidence that both arbuscular mycorrhizal fungi and ectomycorrhizal fungi can control a number of plant diseases. A procedure for successful development of disease biocontrol agents in general is used as a background to examine the potential for achieving commercial mycorrhizal biocontrol agents. This includes (i) selection and screening; (ii) characterization involving identification, studies of modes of action and ecophysiology, as well as inoculum production, formulation, application and shelf life; (iii) registration. The last stage is problematic for mycorrhizal fungi, as currently they can be sold as plant growth promoters without any form of costly registration, even though in some instances they may actually function to some extent through biocontrol activity. The significance of this approach is discussed, and some possible ways of enhancing biocontrol by mycorrhizas are considered.Key words: arbuscular mycorrhizas, ectomycorrhizas, biological disease control, soilborne pathogens, modes of action, ecology.

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PEREIRA, J. A. P., I. J. C. VIEIRA, M. S. M. FREITAS, C. L. PRINS, M. A. MARTINS et R. RODRIGUES. « Effects of arbuscular mycorrhizal fungi onCapsicumspp. » Journal of Agricultural Science 154, n^o 5 (28 juillet 2015) : 828–49. http://dx.doi.org/10.1017/s0021859615000714.

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SUMMARYThe benefits of mycorrhizal inoculation on growth, yield and nutrition of plants are well documented. However, mycorrhiza use in pepper and sweet pepper crops (Capsicumspp.) is still rarely exploited compared to other crops of economic importance. The current paper reviews the main aspects of the association between arbuscular mycorrhizal (AM) fungi and plants of pepper and sweet pepper. It includes topics about the effects of AM fungi on nutrition, growth and yield inCapsicumspp., paying particular attention to AM fungi–pathogen interactions, responses to some environmental stresses, as well as biochemical and physiological aspects of AM fungi–plant interaction inCapsicum annuumL.

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Tibbett, Mark, et John W. G. Cairney. « The cooler side of mycorrhizas : their occurrence and functioning at low temperatures ». Canadian Journal of Botany 85, n^o 1 (janvier 2007) : 51–62. http://dx.doi.org/10.1139/b06-152.

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Mycorrhizal associations occur in a range of habitats in which soils are subject to low temperature (≤15 °C) for a significant part of the year. Despite this, most of our understanding of mycorrhizal fungi and their interactions with their plant hosts is based on physiological investigations conducted in the range 20–37 °C using fungi of temperate origin. Comparatively little consideration has been given to the cold edaphic conditions in which many mycorrhizas survive and prosper, and the physiological and ecological consequences of their low temperature environments. In this review, we consider the distribution and persistence of arbuscular and ectomycorrhizal mycorrhizal associations in cold environments and highlight progress in understanding adaptations to freezing resistance and nutrient acquisition at low temperature in mycorrhizal fungi.

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McDermott, E. L., et A. M. Berry. « Mycorrhizal Fungi ». Native Plants Journal 4, n^o 2 (1 septembre 2003) : 141–42. http://dx.doi.org/10.3368/npj.4.2.141.

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Sharma, Abhilasha, et Vasu Mehta. « Mycorrhizal Fungi ». Acta Scientific Agriculture 3, n^o 9 (14 août 2019) : 96–97. http://dx.doi.org/10.31080/asag.2019.03.0614.

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Bagyaraj, D. J. « Mycorrhizal Fungi ». Proceedings of the Indian National Science Academy 80, n^o 2 (1 juin 2014) : 415. http://dx.doi.org/10.16943/ptinsa/2014/v80i2/55118.

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Menoyo, Eugenia, Alejandra G. Becerra et Daniel Renison. « Mycorrhizal associations in Polylepis woodlands of Central Argentina ». Canadian Journal of Botany 85, n^o 5 (mai 2007) : 526–31. http://dx.doi.org/10.1139/b07-042.

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Polylepis woodlands are one of the most threatened mountain ecosystems of South America, and their restoration is a high priority. To assess the mycorrhizal status in Polylepis woodlands of “Quebrada del Condorito” National Park (Córdoba Mountains, Central Argentina), we examined the roots of 22 plant species, belonging to 14 families and determined morphological types of arbuscular mycorrhiza (Arum and Paris type) and colonization level. The 22 species were colonized by arbuscular mycorrhizal fungi and dark septate endophytes. Different arbuscular mycorrhizal structures and colonization patterns were observed, although Paris-type colonization was predominant. Fourteen plant species are reported for the first time as hosts of arbuscular mycorrhizal fungi. We conclude that arbuscular mycorrhizal fungi and dark septate endophyte hosts are widespread in the Polylepis woodlands of Central Argentina and should receive special attention in future revegetation programs.

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Fidelibus, Matthew W., Chris A. Martin et Jean C. Stutz. « Arbuscular Mycorrhizal (AM) Fungal Isolates Differentially Altered Morphology of Young `Volkamer' Lemon Plants under Well-watered Conditions ». HortScience 32, n^o 3 (juin 1997) : 443F—444. http://dx.doi.org/10.21273/hortsci.32.3.443f.

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Four AM fungal isolates (Glomus sp.) were screened for effects on growth of `Volkamer' lemon (Citrus volkameriana Ten. and Pasq.) under well-watered conditions. Plants were inoculated with an isolate of AM fungi, or non-inoculated. Non-mycorrhizal plants received more phosphorus (P) fertilizer than mycorrhizal plants because mycorrhizae enhance P uptake. Mycorrhizal and non-mycorrhizal plants were grown in 8-liter containers for 3 months in a glasshouse. Plants were then harvested, and root length colonized by mycorrhizal fungi, leaf P concentration, and plant growth were determined. Root length colonized by AM fungi differed among isolates; control plants were non-mycorrhizal. Leaf P concentration was in the optimal range for all plants; however, plants colonized by Glomus mosseae Isolate 51C had higher leaf P concentration than non-mycorrhizal plants. Plants colonized by Glomus AZ112 had higher leaf P concentration than all other plants. All plants had similar canopy leaf area, shoot length, and shoot dry mass. Plants colonized with AM fungi, except Glomus mosseae Isolate 51C, had longer root length and greater root dry mass than non-mycorrhizal plants. All mycorrhizal plants had lower shoot:root dry mass and leaf area:root length ratios than non-mycorrhizal plants. Our results showed that under optimal P nutrition and well-watered conditions, AM fungal isolates differentially altered the morphology of citrus plants by stimulating root growth.

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Moreira, Samuel D., André C. França, Wellington W. Rocha, Evandro S. R. Tibães et Eudes Neiva Júnior. « Inoculation with mycorrhizal fungi on the growth and tolerance to water deficit of coffee plants ». Revista Brasileira de Engenharia Agrícola e Ambiental 22, n^o 11 (novembre 2018) : 747–52. http://dx.doi.org/10.1590/1807-1929/agriambi.v22n11p747-752.

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ABSTRACT Water stress can be alleviated in plants inoculated with arbuscular mycorrhizal fungi compared to that experienced by those without mycorrhizae. The objective of this study was to evaluate the growth of coffee plants colonized by arbuscular mycorrhizal fungi under different soil moisture conditions. Seeds of the coffee cultivar Catuaí Vermelho IAC 99 and three fungal inoculants (Rhizophagus clarus, Claroideoglomus etunicatum and Dentiscutata heterogama) were used in this study. The soil moisture contents tested were 40, 60, 80, and 100% of field capacity. Seedlings in the matchstick stage were inoculated with mycorrhizae, and then later planted in plastic pots when they developed four to five pairs of definitive leaves. Both the extent of mycorrhizal colonization and increases in leaf area were related to soil moisture content in a quadratic manner for plants inoculated with all three mycorhizzal fungi (R. clarus, C. etunicatum, and D. heterogama), as well as for non-inoculated ones. The highest value of colonization of coffee by mycorrhizae was 39%, which occurred in association with R. clarus at 71% of field capacity. The leaf areas of plants inoculated with fungi increased more than those of non-inoculated plants, regardless of the type of inoculum used. Plants inoculated with D. heterogama at 100% field capacity produced 21% more root dry mass than non-inoculated plants did. Inoculation with arbuscular mycorrhizal fungi and higher soil moisture increased the growth of coffee seedlings. The plants inoculated with R. clarus, C. etunicatum, and D. heterogama were tolerant to moderate water deficits (i.e. lower soil water contents). Mycorrhizal colonization was highest for plants in soils with moisture levels close to 75% of field capacity.

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Farias-Larios, J., S. Guzman-Gonzalez et A. Michel-Rosales. « The Advances in the Study on Mycorrhizas of Fruit Trees in Dry Tropics of Mexico ». HortScience 31, n^o 4 (août 1996) : 684c—684. http://dx.doi.org/10.21273/hortsci.31.4.684c.

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The productivity of marginal soils frequently found in the arid tropics might be improved by using VAM fungi as “biofertilizer” and as a tool of sustainable agricultural systems. Study of mycorrhizas of fruit trees was performed in 1987 in western Mexico. More progress has been made in resources, taxonomy, anatomy and morphology, physiology, ecology, effects, and application of mycorrhizas in fruit trees and ornamental plants production. Currently, five genera has been identified and inoculated plants showed significant difference in respect to plants not inoculated with mycorrhizal fungi. Citrus trees were highly dependent on mycorrhizae for normal growth and development, while the banana plants showed lower levels of root colonization by different strains of VAM fungi. The added endomycorrhizal inoculum significantly increased root fungal colonization in fruit trees and reduce the time in nursery. The current status and research trends in the study of fruit tree mycorrhizas in western Mexico are introduced, and the application prospects in sustainable agriculture also are discussed.

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Tester, M., S. E. Smith et F. A. Smith. « The phenomenon of "nonmycorrhizal" plants ». Canadian Journal of Botany 65, n^o 3 (1 mars 1987) : 419–31. http://dx.doi.org/10.1139/b87-051.

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Most species of plants are normally infected by mycorrhizal fungi, but some plant taxa do not usually form generally recognisable mycorrhizas. The identity and relationships of these "nonmycorrhizal" or weakly mycorrhizal taxa are considered in this review. Mechanisms that are used by the plants for avoiding infection are discussed. Exudation of fungitoxic compounds or simply low levels of exudation are not believed to inhibit infection. Similarly, the presence of fungitoxic compounds in root cortex cells is not believed to prevent mycorrhizal fungi from infecting weakly mycorrhizal plants. It is proposed that the control of mycorrhizal fungal penetration is exerted by interactions between the organisms at the level of the cell wall and (or) middle lamella.

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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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