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Rhizosphere Microbiome of Pinyon Pine
Başlık:
Rhizosphere Microbiome of Pinyon Pine
Yazar:
Andrews, Lela Violet, author.
ISBN:
9780438006997
Yazar Ek Girişi:
Fiziksel Tanımlama:
1 electronic resource (152 pages)
Genel Not:
Source: Dissertation Abstracts International, Volume: 79-10(E), Section: B.
Includes supplementary digital materials.
Advisors: Catherine A. Gehring Committee members: Matthew A. Bowker; Thomas G. Whitham; Jason A. Wilder.
Özet:
Forest ecosystems worldwide are under increased pressures from climate change, which includes widespread trends toward warmer and drier conditions. Symbiotic relationships with favorable microbes in the soil, such as mycorrhizal fungi, can improve plant performance under hot and dry conditions. Other microbes (bacteria, archaea, nonmycorrhizal fungi) offer survival benefits to plant populations by further improving soil conditions, suppressing microbial pathogens, and by enhancing the process of mycorrhization. In the southwestern United States, pinyon pine (Pinus edulis) populations are especially susceptible to drought conditions. As a dominant forest tree species of the region, its loss across the landscape could have severe consequences for dependent plant and animal species and human cultures alike. It is not known how the loss of even some P. edulis individuals will affect the diversity of soil microbial taxa, or how their potential loss may affect recruitment of new seedlings in the future, either through natural processes or restoration efforts. To address this gap in knowledge, I explore the soil microbial communities of pinyon pine seedlings growing in a common garden near Sunset Crater National Monument near Flagstaff, AZ. This facility is populated by seedlings which possess genotypes that are either tolerant or intolerant to drought stress. I used these communities to optimize an analysis workflow for processing community amplicon data for bacterial and fungal marker gene sequencing projects. I then show that soil microbial communities respond to the presence of different seedling genotypes in a natural setting. My data, using modern high-throughput sequencing techniques, reveals patterns consistent with data collected previously by root-tip assays in that a similar difference is observed in relative abundance of certain mycorrhizal fungal taxa (e.g., Geopora spp.). I also discuss differences observed in nonmycorrhizal soil microbes according to seedling genotype, and provide an updated catalogue of microbial taxa (bacteria, archaea and fungi) present in soils at Sunset Crater National Monument. Finally, I discuss management implications for pinyon pine ecosystems in the context of soil microbial communities. By seeking to preserve above-ground genetic diversity, we may provide an opportunity to also preserve below-ground biodiversity which may be important for maintaining ecosystem health in forested ecosystems.
Notlar:
School code: 0391
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Yer Numarası | Demirbaş Numarası | Shelf Location | Lokasyon / Statüsü / İade Tarihi |
---|---|---|---|
XX(678742.1) | 678742-1001 | Proquest E-Tez Koleksiyonu | Arıyor... |
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