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A 5.4 kb BamHl fragment of R. leguminosarum bv. trifolii TA1 was found to carry genes involved in exopolysaccharide synthesis (caro genes). This fragment was strongly hybridized to the total DNA from R. I. bv. viciae and bv. phaseoli digested with EcoRI. No homology was found with total DNA of R. meliloti and Rhizobium sp. NGR 234. The exo genes from R. I. bv. trifoliiTAl conjugally introduced into...
Rhizobium lexuminosarum bv. trifolii produces an acidic exopolysac- charide (EPS) which plays an important role in the development of nitrogen-fixing nodules. Tn5 mutant of R. trifolii <>3 defective in EPS production (Exo") forms ineffective (Fix-) nodules on red clover. This Exo mutation is complemented by the pARF1368 and pARF25c<>Miiid.s isolated fnuii bank of Rhizobium trifolii...
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