| Title | Soil C and N statuses determine the effect of maize inoculation by plant growth-promoting rhizobacteria on nitrifying and denitrifying communities |
| Publication Type | Journal Article |
| Year of Publication | 2017 |
| Authors | Florio A., Pommier T., Gervaix J., Bérard A., Le Roux X. |
| Journal | Scientific Reports |
| Volume | 7 |
| Pagination | 12 |
| Date Published | Aug |
| Type of Article | Article |
| ISBN Number | 2045-2322 |
| Accession Number | WOS:000408106000002 |
| Keywords | ammonia-oxidizers, annual grassland, available, azospirillum-lipoferum crt1, carbon, field conditions, genetic-structure, microbial communities, rhizosphere microorganisms, root development, Science & Technology - Other Topics, zea-mays |
| 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 (
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| Short Title | Sci RepSci Rep |
| Alternate Journal | Sci Rep |
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Florio, Alessandro Pommier, Thomas Gervaix, Jonathan Berard, Annette Le Roux, Xavier
Florio, Alessandro/0000-0001-6814-8675
French Agency for Research, ANR [ANR-12-AGRO-0008]
We acknowledge funding by the French Agency for Research, ANR, to the AZODURE project (ANR-12-AGRO-0008) and to the associated post-doctoral fellowship of AF. We thank all the members from the AZODURE project who participated to the soil sampling campaigns, and Samuel Jean for his review of the text wording.
18
Nature publishing group
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Florio, A (reprint author), Univ Lyon 1, CNRS, INRA, LEM,UMR 1418,UMR 5557, Villeurbanne, France.
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