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 11 of 11 for “"diazotrophs"”.
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In the Margins: Reconsidering the Range and Contribution of Diazotrophs in Nearshore Environments
<p>Dinitrogen (N<sub>2</sub>) fixation enables primary production and, consequently, carbon dioxide drawdown in nitrogen (N) limited marine systems, exerting a powerful influence over the coupled carbon and N cycles. Our understanding of the environmental factors regulating its distribution and …
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Ecology of Root Nodule Bacterial Diversity: Implications for Soybean Growth
Diazotrophs supply legumes such as soybean (Glycine max L. Merr) with nitrogen (N) needed for protein synthesis through biological nitrogen fixation (BNF). Through BNF, these bacteria such as Bradyrhizobium that reside in soybean root nodules, convert atmospheric nitrogen (N2) into ammonia (NH3/ …
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Detection and Capture of Nitrogen Fixing Bacteria From Soil and Roots Using Plant Specific Lectins
<p>Diazotrophs increase plant productivity by providing ammonia directly to plants in the rhizosphere or through association with the roots (Sun et al., 2021). Leveraging diazotrophs can aid in the reduction or application of harmful synthetic nitrogen fertilizers. This thesis aims to use plant …
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Exploring the Spatial Distribution of Marine Nitrogen Fixation Through Statistical Modeling, High-Resolution Observations and Molecular Level Characterization
… by a select group of microorganisms called diazotrophs, converts nitrogen gas (N2) into bioavailable nitrogen that can support the growth of marine phytoplankton. By supplying new nitrogen to marine ecosystems, marine N2 fixation affects marine primary production, the uptake of carbon …
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Impact of free-living diazotrophs, Azospirillum lipoferum and Gluconacetobacter azotocaptans, on growth and nitrogen utilization by wheat (Triticum aestivum cv. Lillian)
… colonizing, free-living, N2-fixing bacteria (diazotrophs) with the potential to transfer fixed N to associated plants. The purpose of this study was to evaluate the agronomic efficiency of two diazotrophs, Azospirillum lipoferum and Gluconacetobacter azotocaptans, inoculated onto wheat. …
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Ecology of nitrogen-fixing bacteria associated with Miscanthus
… anthropogenic inputs of nitrogen fertilizer. Diazotrophs associated with non-leguminous grasses have great potential to contribute biologically fixed nitrogen as a sustainable N source for bioenergy grasses. There are previous few studies investigating diazotroph community composition …
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Diversity of Free-living Nitrogen Fixing Bacteria in the Badlands of South Dakota
… a nitrogenase enzyme complex and are termed diazotrophs. The best known diazotrophs form symbiotic associations with plants, but free-living nitrogen fixing bacteria also contribute a substantial amount of nitrogen to ecosystems, including arid lands. The aim of this study was to isolate …
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Diazotroph Assemblages of Salt Marsh Plants Growing Along An Environmental Gradient: Assemblage Composition and Responses to Environmental Conditions
… stable. The culturable O<sub>2</sub> utilizing diazotrophs associated with other wetland plants have also been studied and found to be plant host specific and diverse. Coastal salt marshes along the eastern coast of the US typically occur along an elevation gradient that results in a distinctive …
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Mechanistic models of oceanic nitrogen fixation
… tracers and abundances of nitrogen fixers (or diazotrophs) in the northern subtropical gyres suggest variability in nitrogen fixation on interannual and longer timescales. I use a highly idealized, two-layer model of the nitrogen and phosphorus biogeochemistry and ecology of a subtropical gyre …
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Investigating Structure and Function of Rhizosphere Associated Microbial Communities in Natural and Managed Plant Systems
… have beneficial effects on plant growth. Diazotrophs, for example, are bacteria that can convert the atmospheric nitrogen to ammonia, a process called 'nitrogen fixation.' Utilizing the natural process of associative nitrogen fixation to support most of the plant's N needs would …
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Investigation of Miscanthus associated microbiome: effects of biotic and abiotic factors
… bacteria groups, Miscanthus-associated diazotrophs assemblages were also examined in this work. I found endophytic and rhizosphere communities correlated differently with their surrounding environment. Overall, I found that endophytic communities were more likely to be genotype-specific …