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Trends in microbiology · Oct 2009
ReviewEstablishing nitrogen-fixing symbiosis with legumes: how many rhizobium recipes?
- Catherine Masson-Boivin, Eric Giraud, Xavier Perret, and Jacques Batut.
- Laboratoire des Interactions Plantes Micro-organismes (LIPM), UMR CNRS-INRA 2594/441, BP 52627, 31326 Castanet Tolosan Cedex, France. catherine.masson@toulouse.inra.fr
- Trends Microbiol. 2009 Oct 1;17(10):458-66.
AbstractRhizobia are phylogenetically disparate alpha- and beta-proteobacteria that have achieved the environmentally essential function of fixing atmospheric nitrogen (N(2)) in symbiosis with legumes. All rhizobia elicit the formation of root - or occasionally stem - nodules, plant organs dedicated to the fixation and assimilation of nitrogen. Bacterial colonization of these nodules culminates in a remarkable case of sustained intracellular infection in plants. Rhizobial phylogenetic diversity raised the question of whether these soil bacteria shared a common core of symbiotic genes. In this article, we review the cumulative evidence from recent genomic and genetic analyses pointing toward an unexpected variety of mechanisms that lead to symbiosis with legumes.
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