title: A motility revertant of the ndvB mutant of Bradyrhizobium japonicum.
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 beta-(1-->3), (1-->6)-D-glucan synthesis, and symbiosis with soybean. The motility revertant was restored for osmotic tolerance but not for cyclic beta-glucan production or effective symbiosis. These results support our hypothesis that cyclic beta-glucans have an important role in symbiosis--the suppression of a plant defense response--in addition to their role in periplasmic osmoprotection.
authors.affiliation: Soybean Genomics and Improvement Laboratory, Beltsville Agricultural Research Center, Agricultural Research Service, United States Department of Agriculture, Building 002, BARC-West, Beltsville, MD 20705, USA.
authors.forename: Rongji
authors.initials: R
authors.lastname: Chen
authors.forename: Arvind A
authors.initials: AA
authors.lastname: Bhagwat
authors.forename: Donald L
authors.initials: DL
authors.lastname: Keister
mesh_terms: D001426:Bacterial Proteins / Q000235:genetics; D020369:Bradyrhizobium / Q000235:genetics* / Q000502:physiology*; D005936:Glucans / Q000096:biosynthesis; D009068:Movement; D009154:Mutation; D009997:Osmotic Pressure; D013025:Glycine max / Q000382:microbiology; D013559:Symbiosis
chemical_list: D001426:Bacterial Proteins; D005936:Glucans; C033671:epiglucan