Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 26 for “"Ectomycorrhizal fungi"”.
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Ecological and taxonomic studies of ectomycorrhizal fungi associated with Aspen
A discrete aspen clone was sampled for ectomycorrhizal sporocarps over 4 years in an area impacted by copper mining in Butte, Montana. Locations of sporocarps were noted and species identified. A majority of the mycorrhizal fungi found in the aspen stand were early colonizers or species …
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Diversity of ectomycorrhizal fungi on two reclaimed surface mines differing in soil properties
I analyzed community structure of ectomycorrhizal fungi on white pine (Pinus strobus) on two reclaimed surface mines in eastern Ohio. One site was acidic and metal-stressed, the other was alkaline. Completely different community composition was found on the two sites by PCR/ITS/RFLP analyses of …
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Succession of ectomycorrhizal fungi associated with Engelmann spruce and subalpine fir in Wyoming
Fungi associated with Engelmann spruce and subalpine fir were studied in a high altitude area of western Wyoming. Thirty permanent plots were established and their mean stand age determined. Three age classes were delineated: young (78 years), mature (127 years), and old-age (216 years). Stand and …
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Influence of Varying Inorganic Nutrients Supply on Ergosterol and Glucosamine Concentrations and Biomass Nutrient Stoichiometry in Ectomycorrhizal Fungi
<p>Ectomycorrhizal (ECM) fungi are critical for the health of forest ecosystems where they can sequester large amounts of carbon in the form of soil organic matter, a matter of growing interest due to anthropogenic climate change. A clear understanding of their growth dynamics and responses to …
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Effect of a heavy metal on ecto- and vesicular-arbuscular mycorrhizal fungi: the physiology, ultrastructure, and ecology of copper stress and tolerance
… various aspects of the response of mycorrhizal fungi to copper, and a brief conclusion. The first chapter examines the enzyme tyrosinase in several ectomycorrhizal fungi and shows that its activity is altered in these fungi in response to copper. Polyamines are also examined in this chapter, and …
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Aspen mycorrhizae: ecology, syntheses and growth studies
The ectomycorrhizal communities of three aspen-covered sites in southwestern Montana and southeastern Idaho with varying stand age, conditions, and soil types were compared. In all, 39 species of ectomycorrhizal fungi were associated with P. tremuloides. Dominant fungal species varied by site. …
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Ecological and taxonomic studies of the Russulaceae and other ectomycorrhizal Basidiomycetes in the high-elevation forests of the southern Appalachians
… and<i>Lactarius</i>) are among the dominant ectomycorrhizal fungi in forest communities. The contribution of the Russulaceae to the communities of ectomycorrhizal Basidiomycetes fruiting in red spruce and adjacent northern hardwood forests in West Virginia was evaluated and compared with …
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Trace metal effects on ectomycorrhizal growth, diversity, and colonization of host seedlings
Ectomycorrhizal fungi are essential to seedling establishment in disturbed sites. This dissertation examines the effects of trace metals and soil disturbance on ectomycorrhizal fungi in the laboratory and the field. The first experiment assessed Cu and Zn impact on growth of three ectomycorrhizal …
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Community Ecology Of Soil Microbes In Southeast Usa Oak-Pine Woodlands
… community composition and enzyme activities of Ectomycorrhizal fungi (emf). Chapter 2 considers whether host specificity in emf structures taxa occurrence on oaks and pines, and chapter 3 investigates how ash addition affects oak seedling growth and the soil bacterial community. I found that …
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The effects of age and size of canopy gaps on the mycorrhizae of yellow birch (Betula alleghaniensis Britton) and sugar maple (Acer sacchrum Marsh.) from deciduous forests of the Québec city region
… and coils were quantified. Colonization by ectomycorrhizal fungi was quantified and characterized using morphotyping and molecular techniques. In the 1-yr old 1000 m 2 cuts, colonization increased in the maple roots as the season progressed. In October, there were more arbuscules in the …
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British mycology: a historical perspective and genetic analysis of Boletus edulis Bull.
… were present in populations, a first for ectomycorrhizal fungi. Some HFCs were detectable but were not consistent across populations studied. The second section of the thesis uses the methodological tools of the history of science to explore the origins of British mycology, presenting the …
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Effects of soil nutrient availability on the development of tropical monodominance and subordinate species composition in montane forests
… this study aimed to understand how an ectomycorrhizal tree species, Oreomunnea mexicana, achieves high abundance. The study assessed soil properties along with species composition using a paired plot design consisting of mixed forest and nearby Oreomunnea-dominated forest sampled at …
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Investigating the ecology of partial and full myco-heterotrophy among Orchidaceae and Ericaceae using the stable isotope natural abundance analysis approach
… upon organic nutrient supplies from associated fungi. Comprising almost a quarter of all known myco-heterotrophic species, the Orchidaceae are the most successful family among myco-heterotrophic plants. All orchids are myco-heterotrophic during their juvenile belowground phases but most species …
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Ectomycorrhizal associations in tropical montane forest: insights into their influence on nutrient cycling and functional responses to soil fertility
In Panamanian montane forest, the ectomycorrhizal tree Oreomunnea mexicana forms monodominant stands where it accounts for up to 70% of individuals. Monodominance is unexpected in tropical forest because the accumulation of host-specific pathogens is thought to limit the local abundance of …
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Is Chir Pine Displacing Banj Oak in the Central Himalaya? Socioeconomic Implications for Local People and the Conservation of Oak Forest Biodiversity
… this species to precipitation. Also, samples of ectomycorrhizal fungi were collected in the form of fruiting bodies and root tips of banj oak and chir pine for DNA analysis, to identify the species associated with these forest types. Since these forests are heavily exploited by local people, …
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The role of acid phosphatases in the phosphorus nutrition of arctic tundra plants
… non-mycorrhizal root system; and that of ectomycorrhizal roots. Eriophorum has phosphatase activity which is evenly distributed along its root surface, has a pH optimum at soil pH (3.5-4.0), and continues at substantial rates at 1 °C. Inorganic phosphorus inhibits activity only 7 to 19%. …
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Mycorrhizal fungus communities of Douglas-fir (Pseudotsuga menziesii) seedlings and trees: effects of proximity to residual trees
… stands on seedling growth and colonization by ectomycorrhizal fungi (EMF) is not well understood. To investigate this, Douglas-fir seedlings were planted near (<6 m) and far (>16 m) from 44- to 72-year-old residual Douglas-fir trees at three sites in western Washington, USA. Seedling stem …
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