Specific hopanoid classes differentially affect free-living and symbiotic states of Bradyrhizobium diazoefficiens.

ABSTRACT:

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A better understanding of how bacteria resist stresses encountered during the progression of plant-microbe symbioses will advance our ability to stimulate plant growth. Here, we show that the symbiotic system comprising the nitrogen-fixing bacterium Bradyrhizobium diazoefficiens and the legume Aeschynomene afraspera requires hopanoid production for optimal fitness. While methylated (2Me) hopanoids contribute to growth under plant-cell-like microaerobic and acidic conditions in the free-living state, they are dispensable during symbiosis. In contrast, synthesis of extended (C35) hopanoids is required for growth microaerobically and under various stress conditions (high temperature, low pH, high osmolarity, bile salts, oxidative stress, and antimicrobial peptides) in the f

SUBMITTER: Kulkarni G 

PROVIDER: S-EPMC4620461 | biostudies-literature | 2015 Oct

REPOSITORIES: biostudies-literature