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作者 Branco, Sara
書名 Serpentine soils and the ecology and evolution of fungal-plant symbiotic partners
國際標準書號 9781124197296
book jacket
說明 111 p
附註 Source: Dissertation Abstracts International, Volume: 71-10, Section: B, page: 5867
Advisers: Gregory M. Mueller; Richard H. Ree
Thesis (Ph.D.)--The University of Chicago, 2010
Extreme environments tend to host depauperate and specialized biological communities. Serpentine soils, stressful due to high heavy metal levels, poor nutrient contents, and unbalanced calcium to magnesium ratios, exemplify this phenomenon by imposing well-known constraints on plants. Here, I study the effects of serpentine soil on the ecology and evolution of a fungalplant symbiotic system to investigate adaptive responses in symbiotic partners under the same environmental constraint. I focused on serpentine ectomycorrhizal (ECM) fungal communities associated with Quercus ilex subsp. ballota and used a combination of field, greenhouse, and molecular approaches to examine community- and population-level differentiation patterns in the fungi and the plant. I found rich and phylogenetically diverse serpentine fungal communities, as well as widespread serpentine tolerance in ECM fungi. Although serpentine soil is a distinct environment hosting different fungal communities, I found no indication of it being physiologically challenging. I also report the existence of local adaptation in Q. ilex subsp. ballota, with serpentine ecotypic differentiation evidenced by disproportional root allocation, as well as limits to gene flow among populations and significant population-genetic structure. My results show that serpentine soils influence the ecology and evolution of symbiotic partners differently, with differential patterns detectable only at the plant-level
School code: 0330
Host Item Dissertation Abstracts International 71-10B
主題 Biology, General
Biology, Ecology
Biology, Evolution and Development
Alt Author The University of Chicago. Evolutionary Biology
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