Nicotinic acid requirement and degradation by Sesbania rhizobium strain ORS571
نویسندگان
چکیده
Sevhtrriia rliizobiuni strain ORS57 1. which grows in the free-living state at the expense of N, or ammonia. requires nicotinic acid as a growth factor and also uses this vitamin as a nitrogen source in culture medium devoid of ammonia. Consequently, under nitrogen-fixing conditions, Sesbania rhizohiw1 requires about 10-times more nicotinic acid than when grown in the presence of ammonia. The physiological implications of this property are discussed.
منابع مشابه
The fast-growing Rhizobium strain ORS571, isolated from stem nodules of the tropical legume
In Rhizobium ORS571, which is able to form both root and stem nodules on the tropical plant Sesbania rostrata and to grow in the free-living state at the expense of N,, two copies of the nijH gene, which codes for the nitrogenase Fe-protein, were characterized. One copy, nijHl, was localized in the nijHDK operon; the other, nzjH2, was localized elsewhere. nijH1 and nijH2 differed in only six nu...
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