Proceedings of the National Academy of Sciences of the United States of America, Vol. 90, No. 8 (Apr. 15, 1993), pp. 3378-3382 (5 pages) ...

Spontaneous mutants of Rhizobium meliloti L5-30 defective in motility or chemotaxis were isolated and compared against the parent with respect to symbiotic competence. Each of the mutants was able to ...