Detection and Capture of Nitrogen Fixing Bacteria From Soil and Roots Using Plant Specific Lectins
type: CreativeWork
description: 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 root proteins, or lectins, to more rapidly recover viable diazotrophs that are likely to associate with crops. In this study, lectins, are used to recover bacteria from bulk soil by taking advantage of the binding relationship between lectins and bacterial cell surface polysaccharides. When commercially-available lectins were used with a magnetic pulldown to separate the lectin, bacterial complex from soil, a different community of bacteria was selected in comparison to the native soil population. The lectin assay recovered species from Classes known to contain diazotrophs and other nutrient cyclers such as: Actinobacteria, Alphaproteobacteria, Bacilli, Betaproteobacteria, Chloroflexia, Cytophagia, Deltaproteobacteria, Gammapoteobacteria, and Sphingobacteriia.
abstract: 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 root proteins, or lectins, to more rapidly recover viable diazotrophs that are likely to associate with crops. In this study, lectins, are used to recover bacteria from bulk soil by taking advantage of the binding relationship between lectins and bacterial cell surface polysaccharides. When commercially-available lectins were used with a magnetic pulldown to separate the lectin, bacterial complex from soil, a different community of bacteria was selected in comparison to the native soil population. The lectin assay recovered species from Classes known to contain diazotrophs and other nutrient cyclers such as: Actinobacteria, Alphaproteobacteria, Bacilli, Betaproteobacteria, Chloroflexia, Cytophagia, Deltaproteobacteria, Gammapoteobacteria, and Sphingobacteriia.
author: Horton, Alana
keywords: Bacteria, Diazotrophs, Lectins, Isolation, Soil, BNF, Roots, Agricultural Science, Agronomy and Crop Sciences, Biology, Life Sciences, Microbiology, Molecular Biology
date published: 2026-05-29T07:00:00Z
date modified: 2026-07-24T02:05:00Z
provider: Dominican University of California
publisher: Networked Digital Library of Theses and Dissertations
type: WebPage
source organization: Dominican University of California