Unraveling negative biotic interactions determining soil microbial community assembly and functioning
2022
Romdhane, Sana | Spor, Aymé | Aubert, Julie | Bru, David | Breuil, Marie-Christine | Hallin, Sara | Mounier, Arnaud | Ouadah, Sarah | Tsiknia, Myrto | Philippot, Laurent | Agroécologie [Dijon] ; Université de Bourgogne (UB)-Université Bourgogne Franche-Comté [COMUE] (UBFC)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Institut Agro Dijon ; Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro)-Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro) | Mathématiques et Informatique Appliquées (MIA Paris-Saclay) ; AgroParisTech-Université Paris-Saclay-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE) | Swedish University of Agricultural Sciences = Sveriges lantbruksuniversitet (SLU) | Agricultural University of Athens | Agroécologie [Dijon] ; Université de Bourgogne (UB)-AgroSup Dijon - Institut National Supérieur des Sciences Agronomiques, de l'Alimentation et de l'Environnement-Université Bourgogne Franche-Comté [COMUE] (UBFC)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE) | This research was funded through the 2016 ERA-NET BiodivERsA COFUND call forresearch proposals, with the national funders Agence Nationale de la Recherche(ANR, France; grant ANR-16-EBI3-0004-01) and the Swedish Research Council(FORMAS, Sweden). The authors would like to thank Noah Fierer for helpfuldiscussion and valuable comments on the manuscript. | ANR-16-EBI3-0004,digging_deeper,Agro-ecosystem diversification: digging deeper(2016) | ANR-17-CE32-0011,NGB,Biosurveillance Next-Gen des changements dans la structure et le fonctionnement des écosystèmes(2017)
International audience
Show more [+] Less [-]English. Abstract Microbial communities play important roles in all ecosystems and yet a comprehensive understanding of the ecological processes governing the assembly of these communities is missing. To address the role of biotic interactions between microorganisms in assembly and for functioning of the soil microbiota, we used a top-down manipulation approach based on the removal of various populations in a natural soil microbial community. We hypothesized that removal of certain microbial groups will strongly affect the relative fitness of many others, therefore unraveling the contribution of biotic interactions in shaping the soil microbiome. Here we show that 39% of the dominant bacterial taxa across treatments were subjected to competitive interactions during soil recolonization, highlighting the importance of biotic interactions in the assembly of microbial communities in soil. Moreover, our approach allowed the identification of microbial community assembly rule as exemplified by the competitive exclusion between members of Bacillales and Proteobacteriales. Modified biotic interactions resulted in greater changes in activities related to N- than to C-cycling. Our approach can provide a new and promising avenue to study microbial interactions in complex ecosystems as well as the links between microbial community composition and ecosystem function.
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