Rhizobium sp. strain ORS571 grows synergistically on N2 and nicotinate as N sources.
نویسنده
چکیده
Rhizobium sp. strain ORS571 conducts synergistic, free-living N2 fixation and nicotinate oxidation. Explicitly, ORS571 is able to fix N2 aerobically because 6-OH-nicotinate acts as an intracellular O2 sink. Because 6-OH-nicotinate oxidation is mandatory for aerobic, free-living N2 fixation and because the synergistic processes yield ammonium from substrates (as the nitrogen source for growth), ORS571 is not a diazotroph.
منابع مشابه
Nicotinic acid requirement and degradation by Sesbania rhizobium strain ORS571
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 p...
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In wild-type Azorhizobium caulinodans ORS571, nicotinate served both as anabolic substrate for NAD+ production and as catabolic substrate for use as the N source. Catabolic enzyme activities were greatest from cultures grown with nicotinate as the N source and least when cultures were grown with ammonium as the N source. Vector insertion mutants unable to catabolize nicotinate (nic::Vi mutants)...
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متن کاملThe 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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ورودعنوان ژورنال:
- Journal of bacteriology
دوره 165 1 شماره
صفحات -
تاریخ انتشار 1986