Effects of vegetation cover and season on soil nitrifiers in an African savanna: Evidence of archaeal nitrifier inhibition by grasses
2022
Srikanthasamy, Tharaniya | Barot, Sébastien | Koffi, Fulgence | Tambosco, Kevin | Marcangeli, Yoan | Carmignac, David | N'Dri, Aya Brigitte | Gervaix, Jonathan | Leloup, Julie | Le Roux, Xavier | Lata, Jean-Christophe | Institut d'écologie et des sciences de l'environnement de Paris (iEES Paris) ; Institut de Recherche pour le Développement (IRD)-Sorbonne Université (SU)-Université Paris-Est Créteil Val-de-Marne - Paris 12 (UPEC UP12)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE) | Université Nangui Abrogoua (UNA) | Laboratoire d'Ecologie Microbienne - UMR 5557 (LEM) ; Université Claude Bernard Lyon 1 (UCBL) ; Université de Lyon-Université de Lyon-Ecole Nationale Vétérinaire de Lyon (ENVL)-VetAgro Sup - Institut national d'enseignement supérieur et de recherche en alimentation, santé animale, sciences agronomiques et de l'environnement (VAS)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE) | Tomsk Polytechnic University [Russie] (UPT) | French national program EC2CO-MicrobiEn 2014 (project: Impact of grass and tree diversity on microbial diversity and soil functioning) | the Sorbonne University Emergence program 2016 (project: SU-16-R-EMR-37-WASCINNI) | the French Agronomic Research Institute INRAE (EFPA Department) | the GainGrass Project (ANR-19-CE02-0009) funded by the French National Research Agency (ANR) | ANR-19-CE02-0009,GAIN-GRASS,Évaluation globale de l'inhibition de la nitrification par les Poacées tropicales(2019)
International audience
اظهر المزيد [+] اقل [-]إنجليزي. For the first time in a savanna, we analysed the joint influence of climate seasonality and plant cover type on the abundances and transcription levels of bacterial and archaeal nitrifiers, and nitrification enzyme activity (NEA). The dominant tree and grass species stimulated and inhibited nitrification, respectively: NEA was 4-fold higher and 5-fold lower under trees and grasses than in bare soil, respectively. The abundances of bacterial nitrifiers (AOB-amoA) followed the same trend as the abundances of total bacteria did, with higher abundances under grasses and trees than in bare soil and higher abundances during the wet season, but AOB-amoA transcripts were always below detection limit. In contrast, the abundances of archaeal nitrifiers (AOA-amoA) were 13-fold lower under grasses and 2-fold higher under trees than in bare soil, and the AOA-amoA transcript level decreased under grasses during the wet season. Our results show that nitrifier abundances and transcriptional activities are highly seasonal and that nitrification is likely to be dominated by AOA-amoA in these savanna soils. We show for the first time that a dominant grass species (Hyparrhenia diplandra) of humid African savannas inhibits nitrification through marked decreases in AOA-amoA expression levels.
اظهر المزيد [+] اقل [-]الكلمات المفتاحية الخاصة بالمكنز الزراعي (أجروفوك)
المعلومات البيبليوغرافية
تم تزويد هذا السجل من قبل Institut national de la recherche agronomique