Article (Scientific journals)
Terroir is a key driver of seed-associated microbial assemblages
Klaedtke, Stephanie; Jacques, Marie-Agnès; Raggi, Lorenzo et al.
2015In Environmental Microbiology
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Keywords :
seed-associated microbial assemblages; common bean (Phaseolus vulgaris); organic agriculture
Abstract :
[en] Seeds have evolved in association with diverse microbial assemblages that may influence plant growth and health. However, little is known about the composition of seed-associated microbial assemblages and the ecological processes shaping their structures. In this work, we monitored the relative influence of the host genotypes and terroir on the structure of the seed microbiota through metabarcoding analysis of different microbial assemblages associated to five different bean cultivars harvested in two distinct farms. Overall, few bacterial and fungal operational taxonomic units (OTUs) were conserved across all seed samples. The lack of shared OTUs between samples is explained by a significant effect of the farm site on the structure of microbial assemblage, which explained 12.2% and 39.7% of variance in bacterial and fungal diversity across samples. This site-specific effect is reflected by the significant enrichment of 70 OTUs in Brittany and 88 OTUs in Luxembourg that lead to differences in co-occurrence patterns. In contrast, variance in microbial assemblage structure was not explained by host genotype. Altogether, these results suggest that seed-associated microbial assemblage is determined by niche-based processes and that the terroir is a key driver of these selective forces.
Disciplines :
Biochemistry, biophysics & molecular biology
Author, co-author :
Klaedtke, Stephanie ;  Institut Scientifique de Recherche Agronomique - INRA > SAD > Paysage > Form. doct. sc. (sc. & gest. env. - Bologne)
Jacques, Marie-Agnès;  Institut Scientifique de Recherche Agronomique - INRA > IRHS > Emersys
Raggi, Lorenzo;  Università degli Studi di Perugia (UNIPG) > Dipartimento di Scienze Agrarie, Alimentari e Ambientali (DSA3) > Università degli Studi di Perugia (UNIPG)
Préveaux, Anne;  Institut Scientifique de Recherche Agronomique - INRA > IRHS > Emersys
Bonneau, Sophie;  Institut Scientifique de Recherche Agronomique - INRA > IRHS > Emersys
Negri, Valeria;  Università degli Studi di Perugia (UNIPG) > Dipartimento di Scienze Agrarie, Alimentari e Ambientali (DSA3) > Unità di Ricerca - Genetica Agraria e Biotecnologie Genetiche
Chable, Véronique
Barret, Matthieu;  Institut Scientifique de Recherche Agronomique - INRA > IRHS > Emersys
Language :
English
Title :
Terroir is a key driver of seed-associated microbial assemblages
Publication date :
2015
Journal title :
Environmental Microbiology
ISSN :
1462-2912
eISSN :
1462-2920
Publisher :
Blackwell Publishing, Oxford, United Kingdom
Peer reviewed :
Peer Reviewed verified by ORBi
European Projects :
FP7 - 245058 - SOLIBAM - Strategies for Organic and Low-input Integrated Breeding And Management
Funders :
CE - Commission Européenne [BE]
Available on ORBi :
since 29 October 2015

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