Cereal-legume intercropping modifies the dynamics of the active rhizospheric bacterial community

Elisa Taschen (1) , Laurie Amenc (1) , Estelle Tournier (1) , Philippe Deleporte (1) , Philippe Malagoli (2) , Joëlle Fustec (2) , David Bru (3) , Laurent Philippot (3) , Laetitia Bernard (1)

1 UMR Eco&Sols - Ecologie fonctionnelle et biogéochimie des sols et des agro-écosystèmes
2 LEVA - Légumineuses, Ecophysiologie Végétale, Agroécologie
3 Agroécologie [Dijon]

We assessed the impact of intercropping on the microbial communities in the rhizosphere of wheat (Triticum turgidum L. ssp durum) and pea (Pisum sativum L.). Using a RNA based approach coupled with bacterial phylum specific real time PCR, we found that the active bacterial communities in the wheat-pea association were distinct from those in the rhizosphere when crops were cultivated solely. This first explorative study showed that intercropping induced a synergetic interaction, which modified the structure of active microbial communities associated with roots by reducing the representation of Alpha-Proteobacteria and Acidobacteria while promoting Actinobacteria. The latter phylum harbors many species identified as growth promoting bacteria, calling for further analyses to better understand their function for intercropped cultures.

Mots clés: Bacterial phyla; Heterotrophic microbial communities; RNA; cDNA; Quantitative PCR; microbial community; peas; relay cropping

Mots clés: communauté microbienne; rhizosphère; triticum turgidum durum; pisum sativum; pcr quantitative; culture intercalaire

Domaines: Biologie végétale

Elisa Taschen, Laurie Amenc, Estelle Tournier, Philippe Deleporte, Philippe Malagoli, et al.. Cereal-legume intercropping modifies the dynamics of the active rhizospheric bacterial community. Rhizosphere, 2017, 3 (1), pp.191-195. ⟨10.1016/j.rhisph.2017.04.011⟩. ⟨hal-01603314⟩