A Motility Revertant of the ndvB Mutant of Bradyrhizobium japonicum |
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| Authors: | Rongji Chen Arvind A. Bhagwat Donald L. Keister |
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| Affiliation: | (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;(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 |
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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  -(1 3), (16)-D-glucan synthesis, and symbiosis with soybean. The motility revertant was restored for osmotic tolerance but not for cyclic -glucan production or effective symbiosis. These results support our hypothesis that cyclic -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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