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Articoli di riviste sul tema "Mycorrhizas South Australia"
1
Mcgee, P. "Mycorrhizal Associations of Plant-Species in a Semiarid Community". Australian Journal of Botany 34, n. 5 (1986): 585. http://dx.doi.org/10.1071/bt9860585.
Testo completoAbstract (sommario):
Of 93 species in 37 families occurring in a semiarid open mallee community near Murray Bridge, South Australia, 85 species were mycorrhizal. Vesicular-arbuscular mycorrhizas (VAM) were more common than other types of mycorrhizas observed. Genera not previously known to form ectomycorrhizas include Astroloma (Epacridaceae), Comesperma (Polygalaceae), Thysanotus (Asphodelaceae: Liliflorae), Baeckea and Calytrix (Myrtaceae), Dampiera (Goodeniaceae), Podotheca and Toxanthes (Inulae: Asteraceae). Many species were found with both ectomycorrhizas and VAM, with annuals having both VAM and ectomycorrhizas for the whole growing season and perennials usually exhibiting either a predominantly VAM or ectomycorrhizal association. Vesicles were present in plant species not commonly thought of as mycorrhizal hosts.
2
Scheltema, MA, LK Abbott e AD Robson. "Seasonal variation in the infectivity of VA mycorrhizal fungi in annual pastures in a Mediterranean environment". Australian Journal of Agricultural Research 38, n. 4 (1987): 707. http://dx.doi.org/10.1071/ar9870707.
Testo completoAbstract (sommario):
The seasonal variation in the rate and extent of formation of mycorrhizas in pasture soils from two sites in south-west Australia was examined. Undisturbed soil cores were taken on eight occasions throughout the year, sown with Trifolium subterraneum L. and maintained in a glasshouse. At each collection time the extent of formation of mycorrhizas was measured 3 and 6 weeks after sowing.There was no seasonal variation in the extent of mycorrhizas formed in undisturbed soil cores at one site, hut at the other site the extent of mycorrhizas decreased over time. The rate of formation of mycorrhizas was most rapid when cores were collected immediately after the opening rains of the season.Similar species of fungi were present at both sites; however, the rate and extent of infection formed by each species differed between the sites. At both sites the infectivity of A. laevis and fine endophyte decreased throughout the winter months, but the infectivity of Glomus spp. did not change. Neither the total spore number nor an estimate of the number of infective propagules reflected the infectivity of the total population of VA mycorrhizal fungi measured simultaneously at the two sites.
3
Meney, KA, KW Dixon, M. Scheltema e 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. 6 (1993): 733. http://dx.doi.org/10.1071/bt9930733.
Testo completoAbstract (sommario):
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.
4
Not Available, Not Available. "The 3rd International Conference on Mycorrhizas (ICOM3), July 2001, Adelaide, South Australia: "Diversity and Integration in Mycorrhizas"". Mycorrhiza 10, n. 2 (25 agosto 2000): 99–100. http://dx.doi.org/10.1007/s005720000058.
Testo completo
5
Braunberger, P. G., L. K. Abbott e A. D. Robson. "Early vesicular-arbuscular mycorrhizal colonisation in soil collected from an annual clover-based pasture in a Mediterranean environment: soil temperature and the timing of autumn rains". Australian Journal of Agricultural Research 48, n. 1 (1997): 103. http://dx.doi.org/10.1071/a96049.
Testo completoAbstract (sommario):
The results of 2 experiments investigating the early stages of the formation of vesicular- arbuscular (VA) mycorrhizas in response to both soil temperature and the timing of autumn rains are reported for a Mediterranean environment in the south-west of Western Australia. In Expt 1, treatments including an early break, a late break, and a false break followed by a late break were applied to a mixed and sieved field soil collected dry in the summer and placed in pots in a glasshouse. In each break, pots were watered to field capacity and planted with subterranean clover (Trifolium subterraneum) or capeweed (Arctotheca calendula). In early and false breaks, both initiated on the same day in early autumn, the soil temperature was maintained at 30°C, and in the late break, initiated 50 days later in autumn, the soil temperature was maintained at 18°C. In both early and late breaks, pots were watered to field capacity for either 21 or 42 days when plant and mycorrhizal variables were assessed. In a false break, pots were watered to field capacity for 7 days after which the soil was allowed to dry and newly emerged plants died. These pots were then rewatered and replanted at the same time as pots receiving a late break, and subjected to the same soil temperature (18°C). In Expt 2 performed the following year, soil temperature was maintained at 31 or 18°C in both early and late breaks. Pots were planted with clover and watered to field capacity for 21 or 42 days, when plant and mycorrhizal variables were assessed. In Expt 1, VA mycorrhizal colonisation of both clover and capeweed was initially low in an early break compared with levels observed in a late break. Only mycorrhizas formed by Glomus spp. were observed in the early break, whereas mycorrhizas of Glomus, Acaulospora, and Scutellospora spp. and fine endophytes were observed in the late break. Colonisation was decreased by a false break, predominantly because of a decrease in formation of mycorrhizas of Glomus spp. In Expt 2, mycorrhizas of Glomus spp. predominated in warm soil in both early and late breaks and mycorrhizas of Acaulospora spp., Scutellospora spp., and fine endophytes were observed in greater abundance in cool soil in early and late breaks. These experiments indicate that soil temperature at the time of the break will have a large impact on both the overall levels of VA mycorrhizal colonisation of pasture plants and colonisation by different fungi. In addition, fungi that remain quiescent in warm soil may avoid damage in a false break.
6
Warcup, JH. "Mycorrhizal Associations and Seedling Development in Australian Lobelioideae (Campanulaceae)". Australian Journal of Botany 36, n. 4 (1988): 461. http://dx.doi.org/10.1071/bt9880461.
Testo completoAbstract (sommario):
The mycorrhizal associations of Australian Lobelioideae (Lobelia, Pratia and Isotoma) were found to be complex. Perennial species of these genera were solely VA mycorrhizal, whereas annual species were both VA and ectomycorrhizal. Lobelia gibbosa, L. simplicicaulis and L. rhomblfolia had unusual inter- cellular mycorrhizas formed with ectomycorrhizal ascomycetes. While all annual Australian Lobelioideae formed associations with both VA and ectomycorrhizal fungi, five species of Lobelia from South Africa or North America were solely VA mycorrhizal, whether annual or perennial. Seed of the Australian Lobelioideae examined required a ripening period of several months or longer before germination. Seed of L. gibbosa, L. simplicicaulis and L. rhombifolia on germination produced only a short radicle that did not develop further unless invaded by a mycorrhizal fungus. Seed of L. gibbosa and L. simplicicaulis placed beside growing mycorrhizas of certain ascomycetes with young plants of Melaleuca uncinata germinated, and the seedlings became mycorrhizal, grew, and flowered. The subterranean stage dependent on mycorrhizal association with a companion plant lasted 3-4 months. Germinated seed of L. gibbosa on simple agar media failed to become mycorrhizal with appropriate ascomycetes or to develop further. In asymbiotic culture on media incorporating sucrose seedling growth was slight but, in the presence of sucrose and kinetin or N-benzylaminopurine, L. gibbosa developed shoots and often formed small plants that flowered. Root development, however, was scanty or absent even in the presence of the growth substances α-naphthaleneacetic acid or 2,4-Dichlorophenoxyacetic acid. Young plants of L. gibbosa from the field transplanted to U.C. mix or sterilised forest soil failed to produce new roots. The plants grew slowly but remained small and produced few flowers, suggesting that mycorrhizal companion plants may also contribute to their growth besides being necessary in seedling development.
7
Bougher, NL, BA Fuhrer e E. Horak. "Taxonomy and biogeography of Australian Rozites species mycorrhizal with Nothofagus and Myrtaceae". Australian Systematic Botany 7, n. 4 (1994): 353. http://dx.doi.org/10.1071/sb9940353.
Testo completoAbstract (sommario):
Seven species of the putatively obligately ectomycorrhizal fungal genus Rozites are described from Australian Nothofagus and myrtaceaeous forests. Rozites metallica, R. armeniacovelata, R. foetens, and R. occulta are new species associated with Nothofagus in south eastern Australia. Rozites fusipes, previously known only from New Zealand, is reported from Tasmanian Nothofagus forests. Rozites roseolilacina and R. symea are new species associated with Eucalyptus in south eastern and south western Australia respectively. The significance of these Rozites species to mycorrhizal and biogeographical theories, such as the origin of ectomycorrhizal fungi associated with myrtaceous plants in Australia are discussed. The diversity of Rozites species in Australia, which equals or exceeds that of other southern regions, furthers the notion that many species of the genus co-evolved with Nothofagus in the Southern Hemisphere. Rozites symea in Western Australia occurs well outside the current geographic range of Nothofagus. It is considered to be a relict species that has survived the shift in dominant ectomycorrhizal forest tree type from Nothofagus to Myrtaceae (local extinction of Nothofagus 4–5 million years ago), and is most likely now confined to the high rainfall zone in the south west. Data on Rozites in Australia support the concept that at least some of the present set of ectomycorrhizal fungi associated with Myrtaceae in Australia are those which successfully completed a host change from Nothofagus, and adapted to changing climate, vegetation and soil conditions during and since the Tertiary. We suggest that the ancient stock of Rozites arose somewhere within the geographical range of a Cretaceous fagalean complex of plant taxa. By the end of the Cretaceous, Rozites and the fagalean complex may have spanned the Asian–Australian region including perhaps many Southern Hemisphere regions. A northern portion of the ancestral Rozites stock gave rise to extant Northern Hemisphere Rozites species and a southern portion speciated as Nothofagus itself speciated.
8
Phillips, Ryan D., Gary Backhouse, Andrew P. Brown e Stephen D. Hopper. "Biogeography of Caladenia (Orchidaceae), with special reference to the South-west Australian Floristic Region". Australian Journal of Botany 57, n. 4 (2009): 259. http://dx.doi.org/10.1071/bt08157.
Testo completoAbstract (sommario):
Caladenia contains 376 species and subspecies, of which almost all are endemic to temperate and southern semiarid Australia. Eleven species occur in New Zealand, 10 of which are endemic, and one species is widely distributed in eastern Australia and the western Pacific. Only three species occur in both south-western and south-eastern Australia. At subgeneric level, Drakonorchis is endemic to the South-west Australian Floristic Region (SWAFR), Stegostyla to eastern Australia and New Zealand, whereas three subgenera, Calonema, Phlebochilus and Elevatae occur on both sides of the Nullarbor Plain. Subgenus Caladenia is primarily eastern Australian but also extends to the western Pacific. The largest subgenera (Calonema and Phlebochilus) have radiated extensively, with Calonema exhibiting a greater concentration of species in more mesic parts of the SWAFR than Phlebochilus. Within the SWAFR, the major biogeographic division within Caladenia follows the 600-mm isohyet. Within rainfall zones, biogeographic districts for Caladenia correlate with a combination of underlying geology and surface soils. Areas of high endemism contain diverse edaphic environments. Climatic and edaphic requirements are likely to be key drivers of rarity in Caladenia, although these parameters may be acting in concert with mycorrhizal and pollinator specificity.
9
McGee, Peter A., e James M. Trappe. "The Australian zygomycetous mycorrhizal fungi. II. Further Australian sporocarpic Glomaceae". Australian Systematic Botany 15, n. 1 (2002): 115. http://dx.doi.org/10.1071/sb00038.
Testo completoAbstract (sommario):
Glomus atrouva, G. canum, G. cuneatum and G. pellucidum sp. nov. are described from eastern New South Wales. New distributional data and redescriptions are presented for G. australe, G. fuegianum, G. fulvum and G. pubescens, the last three being first reports for Australia. New records of G. caledonium,G. macrocarpum and G. tenerum are also included.
10
Antoniolli, Z. I., E. Facelli, P. O'Connor, D. Miller, K. Ophel-Keller e S. E. Smith. "Spore communities of arbuscular mycorrhizal fungi and mycorrhizal associations in different ecosystems, south Australia". Revista Brasileira de Ciência do Solo 26, n. 3 (settembre 2002): 627–35. http://dx.doi.org/10.1590/s0100-06832002000300007.
Testo completoAbstract (sommario):
Communities of arbuscular mycorrhizal fungi (AMF) were surveyed in different South Australian ecosystems. The soil was wet-sieved for spore extraction, followed by the determination of presence and abundance of AMF species as well as the percentage of root colonization. Mycorrhizal associations were common and there was substantial fungal diversity in different ecosystems. Spores were most abundant in the permanent pasture system and less abundant under continuous wheat. The incidence of mycorrhizal associations in different plant species and the occurrence of Arum and Paris type colonization generally conformed with previous information. Spores of seventeen AMF were verified throughout seasonal changes in 1996 and 1997 in the permanent pasture and on four host species (Lolium perenne, Plantago lanceolata, Sorghum sp. and Trifolium subterraneum) , set up with the same soils under greenhouse conditions. Glomus mosseae was the dominant spore type at all sampling times and in all trap cultures. Mycorrhizal diversity was significantly affected by different sampling times in trap cultures but not in field-collected soil. P. lanceolata, Sorghum sp. and T. subterraneum as hosts for trap cultures showed no differences in richness and diversity of AMF spores that developed in association with their roots. Abundance and diversity were lowest, however, in association with L. perenne , particularly in December 1996. Results show that the combination of spore identification from field-collected soil and trap cultures is essential to study population and diversity of AMF. The study provides baseline data for ongoing monitoring of mycorrhizal populations using conventional methods and material for the determination of the symbiotic effectiveness of AMF key members.
Tesi sul tema "Mycorrhizas South Australia"
1
Bougoure, Jeremy J. "The role of mycorrhizal fungi in nutrient supply and habitat specificity of the rare mycoheterotrophic underground orchid, Rhizanthella gardneri". University of Western Australia. School of Plant Biology, 2009. http://theses.library.uwa.edu.au/adt-WU2009.0076.
Testo completoAbstract (sommario):
Rhizanthella gardneri (Rogers) is a critically endangered orchid restricted to two isolated regions of south-western Australia. Rhizanthella gardneri is an entirely subterranean mycoheterotrophic species that purportedly forms a tripartite relationship with a mycorrhizal fungus (Ceratobasidiales) that links with an autotrophic shrub of the Melaleuca uncinata complex to acquire nutrients. Whether the rarity of R. gardneri is intrinsic is overshadowed by the recent effect of extrinsic factors that means R. gardneri requires some form of conservation and may also be a viable candidate for restoration. To create an integrated conservation strategy for R. gardneri, reasons for its decline and knowledge of its biological and ecological functioning must be elucidated. This thesis focuses on three key questions; 1) what are the habitat requirements and limitations to R. gardneri survival; 2) what is the identity and specificity of the fungus R. gardneri forms mycorrhizas with; and 3) does R. gardneri form a nutrient-sharing tripartite relationship with a mycorrhizal fungus and autotrophic shrub. Key climate, soil and vegetation characteristics of known R. gardneri habitats were quantified to provide baseline data for monitoring known R. gardneri populations, to better understand how R. gardneri interacts with its habitat, and to identify possible new sites for R. gardneri introduction. Habitats of the two known R. gardneri populations differed considerably in soil chemistry, Melaleuca structure and Melaleuca productivity. Individual sites within populations were relatively similar in all attributes measured while overall Northern and Southern habitats were distinct from each other. These results suggest that R. gardneri can tolerate a range of conditions and may be more widespread than previously thought, given that there are extensive areas of Melaleuca thickets with similar habitat characteristics across south-western Australia. The fungus forming mycorrhizas with R. gardneri was identified, using nuclear ribosomal DNA sequences, as a Rhizoctonia-type fungus within the Ceratobasidiales. All fungi isolated from R. gardneri individuals representative of its currently known distribution were genetically similar, suggesting R. gardneri is highly dependent on this specific fungal species. Given that R. gardneri appears to exclusively associate with a specific fungal species, species-specific molecular primers were designed and used to analyse the fungis presence in known and potential R. gardneri habitats. These results 6 suggest that the fungus exists beyond the known R. gardneri habitats and gives hope to finding new populations.
2
Thomas, Benjamin Mark. "The role of vesicular-arbuscular mycorrhizal fungi in Linum usitatissimum L. production in Southern Australian soils". Title page, contents and abstract only, 2001. http://web4.library.adelaide.edu.au/theses/09PH/09pht4541.pdf.
Testo completoAbstract (sommario):
Bibliography: leaves 106-132. This project investigated the role of VAM fungi in the growth and nutrition of Linum usitatissimum L. in agricultural soils in southern Australia. It had two general aims: (1) to examine the role of indigenous VAM fungi in the growth and nutrition of linseed in field soil collected near Clare, South Australia; and (2) to examine the effect of VAM fungi on the Zn nutrition of Linola.
3
Collins, Margaret Thora. "Factors affecting the recovery of orchids in a post-mining landscape". University of Western Australia. School of Earth and Geographical Sciences, 2008. http://theses.library.uwa.edu.au/adt-WU2008.0022.
Testo completoAbstract (sommario):
[Truncated abstract] Currently, Alcoa World Alumina Australia (Alcoa) mines and undertakes procedures to rehabilitate approximately 550 ha of jarrah forest each year at two open-cut bauxite mines in South-West Western Australia. Alcoa aims to establish a self-sustaining jarrah forest ecosystem that maintains the functions of the landscape prior to mining, including biodiversity, on areas that have been mined for bauxite. Indigenous terrestrial orchids form a significant proportion of the indigenous geophytic plant species that either fail to colonise rehabilitated areas or do so very slowly. Terrestrial orchids are considered to be particularly sensitive to competition from weeds and disturbance, which combined with the obligate nature of the orchid-mycorrhizal fungus association suggests that orchids would colonise rehabilitation areas only when both microhabitat sites and soil microflora have established. Occurrence of certain orchids may therefore be expected to be useful as indicators of ecosystem health, the success of vegetation establishment and the recovery of edaphic conditions suitable for orchid mycorrhizal fungi. Vegetation surveys were undertaken to compare orchid species richness and population size of a chrono-sequence of rehabilitation areas with adjacent unmined forest. ... Orchid taxa present in each vegetation assemblage were generally not exclusive to these assemblages, with the following broad exclusions: D. bracteata was found only in species assemblages associated with rehabilitation areas; and Eriochilus sp. and T. crinita were found only in species assemblages associated with unmined forest. No single orchid species appears to be an indicator of ecosystem recovery. However, the presence of populations of C. flava, P. sp. crinkled leaf (G.J.Keighery 13426) or P. recurva in combination with the absence of the disturbance opportunist orchid taxa D. bracteata and M. media appears to be a measure of the maturity of the rehabilitation vegetation. Orchid species richness and clonal orchid population size were correlated with changes in vegetation structure, but apart from the absence of orchids in 1 year old rehabilitation areas, these orchid population characteristics did not show any direct relationship with rehabilitation age or vegetation maturity. Only two orchid taxa appeared to have potential as indicators of vegetation characteristics: T. crinita as an indicator of undisturbed jarrah forest; and D. bracteata as an indicator of disturbed ecosystems. The results of this study suggest that most jarrah forest orchid taxa will readily colonise the post bauxite mining landscape, but that the unassisted colonisation by recalcitrant orchid taxa may be a prolonged process. It is recommended that field-based transplantation and/or seeding trials be undertaken with these recalcitrant taxa to determine if these procedures will enhance recruitment. The results of this work have applications not only in the management of post-mining landscapes but also in vegetation monitoring and conservation work in Western Australia and elsewhere.
4
McGee, P. A. (Peter Allan). "Role of mycorrhizas in the regeneration of arid zone plants". 1987. http://web4.library.adelaide.edu.au/theses/09PH/09phm1448.pdf.
Testo completo
5
McGee, P. A. (Peter Allan). "Role of mycorrhizas in the regeneration of arid zone plants / by Peter Allan McGee". Thesis, 1987. http://hdl.handle.net/2440/18542.
Testo completo
6
Claridge, Andrew Walker. "Hypogeal fungi as a food resource for mammals in the managed eucalypt forests of South-eastern Australia". Phd thesis, 1993. http://hdl.handle.net/1885/140204.
Testo completo
7
Thomas, Benjamin Mark. "The role of vesicular-arbuscular mycorrhizal fungi in Linum usitatissimum L. production in Southern Australian soils / Benjamin Mark Thomas". Thesis, 2001. http://hdl.handle.net/2440/19876.
Testo completoAbstract (sommario):
Bibliography: leaves 106-132.iv, 132 leaves : ill. ; 30 cm.
This project investigated the role of VAM fungi in the growth and nutrition of Linum usitatissimum L. in agricultural soils in southern Australia. It had two general aims: (1) to examine the role of indigenous VAM fungi in the growth and nutrition of linseed in field soil collected near Clare, South Australia; and (2) to examine the effect of VAM fungi on the Zn nutrition of Linola.
Thesis (Ph.D.)--University of Adelaide, Dept. of Soil and Water, 2001