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A Motility Revertant of the ndvB Mutant of Bradyrhizobium japonicum

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Abstract

A motility revertant of a Bradyrhizobium japonicum ndvB mutant was isolated and characterized. The ndvB mutants of B. japonicum have been reported to be osmotically sensitive, as well as defective in motility, periplasmic cyclic β-(1→3), (1→6)-D-glucan synthesis, and symbiosis with soybean. The motility revertant was restored for osmotic tolerance but not for cyclic β-glucan production or effective symbiosis. These results support our hypothesis that cyclic β-glucans have an important role in symbiosis—the suppression of a plant defense response—in addition to their role in periplasmic osmoprotection.

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Authors and Affiliations

  1. Soybean Genomics and Improvement Laboratory, Beltsville Agricultural Research Center, Agricultural Research Service, United States Department of Agriculture, Building 002, BARC-West, Beltsville, MD 20705, United States

    Rongji Chen &  Donald L. Keister

  2. Produce Quality and Safety Laboratory, Beltsville Agricultural Research Center, Agricultural Research Service, United States Department of Agriculture, Building 002, BARC-West, Beltsville, MD 20705, United States

    Arvind A. Bhagwat

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  1. Rongji Chen
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  2. Arvind A. Bhagwat
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  3. Donald L. Keister
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Chen, ., Bhagwat, . & Keister, . A Motility Revertant of the ndvB Mutant of Bradyrhizobium japonicum. Curr Microbiol 47, 431–433 (2003). https://doi.org/10.1007/s00284-003-4066-9

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  • DOI: https://doi.org/10.1007/s00284-003-4066-9

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