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Analysis of nifH - RNA reveals phylotypes related to Geobacter and Cyanobacteria as important functional components of the N2 - fixing community depending on depth and agricultural use of soil

Colaborador(es): Calderoli, Priscila A. Instituto de Biotecnología y Biología Molecular (IBBM), Universidad Nacional de La Plata-CONICET, La Plata, Argentina | Behrends Kraemer, Filipe. Cátedra de Manejo y Conservación de Suelos, Facultad de Agronomía, Universidad de Buenos Aires, Buenos Aires, Argentina | Morrás, Héctor José María. INTA-CIRN, Instituto de Suelos, Hurlingham, Provincia de Buenos Aires, Argentina | Aguilar, O. Mario. Instituto de Biotecnología y Biología Molecular (IBBM), Universidad Nacional de La Plata-CONICET, La Plata, Argentina - Email: aguilar@biol.unlp.edu.ar.
ISSN: 2045-8827.Tipo de material: Recurso electrónico. Artículos y capítulos.Tema(s): CYANOBACTERIA AND GEOBACTER | NIFH TRANSCRIPTS | SOIL DIAZOTROPHIC COMMUNITY | SOIL MANAGEMENT PRACTICES | Recursos en línea: Haga clic para acceso en línea | LINK AL EDITOR En: Microbiology Open Vol.6, (2017), e502, 15 p., grafs., tbls.Resumen: In this survey, a total of 80 787 reads and 28 171 unique NifH protein sequences were retrieved from soil RNA. This dataset extends our knowledge about the structure and diversity of the functional diazotrophic communities in agricultural soils from Argentinean Pampas. Operational taxonomic unit (OTU)-based analyses showed that nifH phylotypes related to Geobacter and Anaeromyxobacter (44.8%), Rhizobiales (29%), Cyanobacteria (16.7%), and Verrucomicrobiales (8%) are key microbial components of N2 fixation in soils associated with no-till management and soil depth. In addition, quantification of nifH gene copies related to Geobacter and Cyanobacteria revealed that these groups are abundant in soils under maize–soybean rotation and soybean monoculture, respectively. The correlation of physicochemical soil parameters with the diazotrophic diversity and composition showed that soil stability and organic carbon might contribute to the functional signatures of particular nifH phylotypes in fields under no-till management. Because crop production relies on soil-borne microorganism’s activities, such as free N2 fixation, the information provided by our study on the diazotrophic population dynamics, associated with the edaphic properties and land-use practices, represents a major contribution to gain insight into soil biology, in which functionally active components are identified.
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In this survey, a total of 80 787 reads and 28 171 unique NifH protein sequences were retrieved from soil RNA.
This dataset extends our knowledge about the structure and diversity of the functional diazotrophic communities in agricultural soils from Argentinean Pampas.
Operational taxonomic unit (OTU)-based analyses showed that
nifH phylotypes related to Geobacter and Anaeromyxobacter (44.8%), Rhizobiales (29%), Cyanobacteria (16.7%), and Verrucomicrobiales (8%) are key microbial components of N2 fixation in soils associated with no-till management and soil depth. In addition, quantification of nifH gene copies related to Geobacter and Cyanobacteria revealed that these groups are abundant in soils under maize–soybean rotation and soybean monoculture, respectively. The correlation of physicochemical soil parameters with the diazotrophic diversity and composition showed that soil stability and organic carbon might contribute to the functional signatures of particular nifH phylotypes in fields under no-till management. Because crop production relies on soil-borne microorganism’s activities, such as free N2 fixation, the information provided by our study on the diazotrophic population dynamics, associated with the edaphic properties and land-use practices, represents a major contribution to gain insight into soil biology, in which functionally active components are identified.

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