Agricultural Management Affects the Active Rhizosphere Bacterial Community Composition and Nitrification Bay, Guillaume Lee, Conard Chen, Chiliang Mahal, Navreet K. Hofmockel, Kirsten S. Halverson, Larry J.
dc.contributor.department Plant Pathology and Microbiology
dc.contributor.department Ecology, Evolution and Organismal Biology
dc.contributor.department Agronomy
dc.contributor.department Microbiology 2021-12-08T21:38:47Z 2021-12-08T21:38:47Z 2021-09-28
dc.description.abstract Cropping system diversity provides yield benefits that may result from shifts in the composition of root-associated bacterial and fungal communities, which either enhance nutrient availability or limit nutrient loss. We investigated whether temporal diversity of annual cropping systems (four versus two crops in rotation) influences the composition and metabolic activities of root-associated microbial communities in maize at a developmental stage when the peak rate of nitrogen uptake occurs. We monitored total (DNA-based) and potentially active (RNA-based) bacterial communities and total (DNA-based) fungal communities in the soil, rhizosphere, and endosphere. Cropping system diversity strongly influenced the composition of the soil microbial communities, which influenced the recruitment of the resident microbial communities and, in particular, the potentially active rhizosphere and endosphere bacterial communities. The diversified cropping system rhizosphere recruited a more diverse bacterial community (species richness), even though there was little difference in soil species richness between the two cropping systems. In contrast, fungal species richness was greater in the conventional rhizosphere, which was enriched in fungal pathogens; the diversified rhizosphere, however, was enriched in Glomeromycetes. While cropping system influenced endosphere community composition, greater correspondence between DNA- and RNA-based profiles suggests a higher representation of active bacterial populations. Cropping system diversity influenced the composition of ammonia oxidizers, which coincided with diminished potential nitrification activity and gross nitrate production rates, particularly in the rhizosphere. The results of our study suggest that diversified cropping systems shift the composition of the rhizosphere’s active bacterial and total fungal communities, resulting in tighter coupling between plants and microbial processes that influence nitrogen acquisition and retention.
dc.description.comments This article is published as Bay G, Lee C, Chen C, Mahal NK, Castellano MJ, Hofmockel KS, Halverson LJ. 2021. Agricultural management affects the active rhizosphere bacterial community composition and nitrification. mSystems 6: e00651-21. This is an open access article distributed under the terms of the Creative Commons Attribution 4.0 International license.
dc.language.iso en
dc.publisher © 2021 Bay et al.
dc.source.uri *
dc.subject.disciplines DegreeDisciplines::Life Sciences::Agriculture
dc.subject.disciplines DegreeDisciplines::Life Sciences::Microbiology::Environmental Microbiology and Microbial Ecology
dc.subject.disciplines DegreeDisciplines::Life Sciences::Ecology and Evolutionary Biology
dc.subject.disciplines DegreeDisciplines::Life Sciences::Plant Sciences
dc.subject.keywords agricultural management
dc.subject.keywords nitrification
dc.subject.keywords rhizosphere-inhabiting microbes
dc.title Agricultural Management Affects the Active Rhizosphere Bacterial Community Composition and Nitrification
dc.type Article
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