Soil C and N statuses determine the effect of maize inoculation by plant growth-promoting rhizobacteria on nitrifying and denitrifying communities

Abstract Maize inoculation by Azospirillum stimulates root growth, along with soil nitrogen (N) uptake and root carbon (C) exudation, thus increasing N use efficiency. However, inoculation effects on soil N-cycling microbial communities have been overlooked. We hypothesized that inoculation would (i...

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Autores principales:	Alessandro Florio, Thomas Pommier, Jonathan Gervaix, Annette Bérard, Xavier Le Roux
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2017
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/69e6a01d58b2408d8ed8f9caa75d4ff3
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spelling	oai:doaj.org-article:69e6a01d58b2408d8ed8f9caa75d4ff32021-12-02T11:40:59ZSoil C and N statuses determine the effect of maize inoculation by plant growth-promoting rhizobacteria on nitrifying and denitrifying communities10.1038/s41598-017-08589-42045-2322https://doaj.org/article/69e6a01d58b2408d8ed8f9caa75d4ff32017-08-01T00:00:00Zhttps://doi.org/10.1038/s41598-017-08589-4https://doaj.org/toc/2045-2322Abstract Maize inoculation by Azospirillum stimulates root growth, along with soil nitrogen (N) uptake and root carbon (C) exudation, thus increasing N use efficiency. However, inoculation effects on soil N-cycling microbial communities have been overlooked. We hypothesized that inoculation would (i) increase roots-nitrifiers competition for ammonium, and thus decrease nitrifier abundance; and (ii) increase roots-denitrifiers competition for nitrate and C supply to denitrifiers by root exudation, and thus limit or benefit denitrifiers depending on the resource (N or C) mostly limiting these microorganisms. We quantified (de)nitrifiers abundance and activity in the rhizosphere of inoculated and non-inoculated maize on 4 sites over 2 years, and ancillary soil variables. Inoculation effects on nitrification and nitrifiers (AOA, AOB) were not consistent between the three sampling dates. Inoculation influenced denitrifiers abundance (nirK, nirS) differently among sites. In sites with high C limitation for denitrifiers (i.e. limitation of denitrification by C > 66%), inoculation increased nirS-denitrifier abundance (up to 56%) and gross N2O production (up to 84%), likely due to increased root C exudation. Conversely, in sites with low C limitation (<47%), inoculation decreased nirS-denitrifier abundance (down to −23%) and gross N2O production (down to −18%) likely due to an increased roots-denitrifiers competition for nitrate.Alessandro FlorioThomas PommierJonathan GervaixAnnette BérardXavier Le RouxNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 7, Iss 1, Pp 1-12 (2017)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Alessandro Florio Thomas Pommier Jonathan Gervaix Annette Bérard Xavier Le Roux Soil C and N statuses determine the effect of maize inoculation by plant growth-promoting rhizobacteria on nitrifying and denitrifying communities
description	Abstract Maize inoculation by Azospirillum stimulates root growth, along with soil nitrogen (N) uptake and root carbon (C) exudation, thus increasing N use efficiency. However, inoculation effects on soil N-cycling microbial communities have been overlooked. We hypothesized that inoculation would (i) increase roots-nitrifiers competition for ammonium, and thus decrease nitrifier abundance; and (ii) increase roots-denitrifiers competition for nitrate and C supply to denitrifiers by root exudation, and thus limit or benefit denitrifiers depending on the resource (N or C) mostly limiting these microorganisms. We quantified (de)nitrifiers abundance and activity in the rhizosphere of inoculated and non-inoculated maize on 4 sites over 2 years, and ancillary soil variables. Inoculation effects on nitrification and nitrifiers (AOA, AOB) were not consistent between the three sampling dates. Inoculation influenced denitrifiers abundance (nirK, nirS) differently among sites. In sites with high C limitation for denitrifiers (i.e. limitation of denitrification by C > 66%), inoculation increased nirS-denitrifier abundance (up to 56%) and gross N2O production (up to 84%), likely due to increased root C exudation. Conversely, in sites with low C limitation (<47%), inoculation decreased nirS-denitrifier abundance (down to −23%) and gross N2O production (down to −18%) likely due to an increased roots-denitrifiers competition for nitrate.
format	article
author	Alessandro Florio Thomas Pommier Jonathan Gervaix Annette Bérard Xavier Le Roux
author_facet	Alessandro Florio Thomas Pommier Jonathan Gervaix Annette Bérard Xavier Le Roux
author_sort	Alessandro Florio
title	Soil C and N statuses determine the effect of maize inoculation by plant growth-promoting rhizobacteria on nitrifying and denitrifying communities
title_short	Soil C and N statuses determine the effect of maize inoculation by plant growth-promoting rhizobacteria on nitrifying and denitrifying communities
title_full	Soil C and N statuses determine the effect of maize inoculation by plant growth-promoting rhizobacteria on nitrifying and denitrifying communities
title_fullStr	Soil C and N statuses determine the effect of maize inoculation by plant growth-promoting rhizobacteria on nitrifying and denitrifying communities
title_full_unstemmed	Soil C and N statuses determine the effect of maize inoculation by plant growth-promoting rhizobacteria on nitrifying and denitrifying communities
title_sort	soil c and n statuses determine the effect of maize inoculation by plant growth-promoting rhizobacteria on nitrifying and denitrifying communities
publisher	Nature Portfolio
publishDate	2017
url	https://doaj.org/article/69e6a01d58b2408d8ed8f9caa75d4ff3
work_keys_str_mv	AT alessandroflorio soilcandnstatusesdeterminetheeffectofmaizeinoculationbyplantgrowthpromotingrhizobacteriaonnitrifyinganddenitrifyingcommunities AT thomaspommier soilcandnstatusesdeterminetheeffectofmaizeinoculationbyplantgrowthpromotingrhizobacteriaonnitrifyinganddenitrifyingcommunities AT jonathangervaix soilcandnstatusesdeterminetheeffectofmaizeinoculationbyplantgrowthpromotingrhizobacteriaonnitrifyinganddenitrifyingcommunities AT annetteberard soilcandnstatusesdeterminetheeffectofmaizeinoculationbyplantgrowthpromotingrhizobacteriaonnitrifyinganddenitrifyingcommunities AT xavierleroux soilcandnstatusesdeterminetheeffectofmaizeinoculationbyplantgrowthpromotingrhizobacteriaonnitrifyinganddenitrifyingcommunities
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Soil C and N statuses determine the effect of maize inoculation by plant growth-promoting rhizobacteria on nitrifying and denitrifying communities

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