Role of methylotrophy during symbiosis between Methylobacterium nodulans and Crotalaria podocarpa

Jourand Philippe, Renier Adeline, Rapior Sylvie, Miana de Faria Sergio, Prin Yves, Galiana Antoine, Giraud Eric, Dreyfus Bernard. 2005. Role of methylotrophy during symbiosis between Methylobacterium nodulans and Crotalaria podocarpa. Molecular Plant-Microbe Interactions, 18 (10) : pp. 1061-1068.

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Abstract : Some rare leguminous plants of the genus Crotalaria are specifically nodulated by the methylotrophic bacterium Methylobacterium nodulans. In this study, the expression and role of bacterial methylotrophy were investigated during symbiosis between M. nodulans, strain ORS 2060T, and its host legume, Crotalaria podocarpa. Using lacZ fusion to the mxaF gene, we showed that the methylotroph genes are expressed in the root nodules, suggesting methylotrophic activity during symbiosis. In addition, loss of the bacterial methylotrophic function significantly affected plant development. Indeed, inoculation of M. nodulans nonmethylotroph mutants in C. podocarpa decreased the total root nodule number per plant up to 60%, decreased the whole-plant nitrogen fixation capacity up to 42%, and reduced the total dry plant biomass up to 46% compared with the wild-type strain. In contrast, inoculation of the legume C. podocarpa with nonmethylotrophic mutants complemented with functional mxa genes restored the symbiotic wild phenotype. These results demonstrate the key role of methylotrophy during symbiosis between M. nodulans and C. podocarpa. (Résumé d'auteur)

Mots-clés Agrovoc : Crotalaria, Bacteria, Biomasse, Expression des gènes, Croissance, Plante hôte, Inoculation, Méthanol, Mutation, Fixation de l'azote, Phénotype, nodosité racinaire, Symbiose

Classification Agris : P34 - Soil biology
F62 - Plant physiology - Growth and development

Champ stratégique Cirad : Axe 1 (2005-2013) - Intensification écologique

Auteurs et affiliations

  • Jourand Philippe, CIRAD-AMIS-UMR LSTM (FRA)
  • Renier Adeline, CIRAD-AMIS-UMR LSTM (FRA)
  • Rapior Sylvie, Centre national de la recherche scientifique (FRA)
  • Miana de Faria Sergio, CIRAD-AMIS-UMR LSTM (FRA)
  • Prin Yves, CIRAD-AMIS-UMR LSTM (FRA) ORCID: 0000-0002-3706-0045
  • Galiana Antoine, CIRAD-AMIS-UMR LSTM (FRA) ORCID: 0000-0002-5293-5049
  • Giraud Eric, IRD (FRA)
  • Dreyfus Bernard, IRD (FRA)

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