Free-living Rhizobium strain able to grow on n(2) as the sole nitrogen source.
نویسندگان
چکیده
A Rhizobium strain isolated from stem nodules of the legume Sesbania rostrata was shown to grow on atmospheric nitrogen (N(2)) as the sole nitrogen source. Non-N(2)-fixing mutants isolated directly on agar plates formed nodules that did not fix N(2) when inoculated into the host plant.
منابع مشابه
Rhizobium sp. strain ORS571 grows synergistically on N2 and nicotinate as N sources.
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), ...
متن کاملA cysG mutant strain of Rhizobium etli pleiotropically defective in sulfate and nitrate assimilation.
By its inability to grow on sulfate as the sole sulfur source, a mutant strain (CTNUX8) of Rhizobium etli carrying Tn5 was isolated and characterized. Sequence analysis showed that Tn5 is inserted into a cysG (siroheme synthetase)-homologous gene. By RNase protection assays, it was established that the cysG-like gene had a basal level of expression in thiosulfate- or cysteine-grown cells, which...
متن کاملGrowth of fast- and slow-growing rhizobia on ethanol.
Free-living soybean rhizobia and Bradyrhizobium spp. (lupine) have the ability to catabolize ethanol. Of the 30 strains of rhizobia examined, only the fast- and slow-growing soybean rhizobia and the slow-growing Bradyrhizobium sp. (lupine) were capable of using ethanol as a sole source of carbon and energy for growth. Two strains from each of the other Rhizobium species examined (R. meliloti, R...
متن کاملProduction of B-group vitamins by two Azotobacter strains with phenolic compounds as sole carbon source under diazotrophic and adiazotrophic conditions.
Azotobacter vinelandii strain ATCC 12837 and A. chroococcum strain H23 (CECT 4435) were able to grow on N-free or NH4Cl-amended chemically-defined (Burk's) media, with protocatechuic acid (1-2 mmol 1(-1)) or sodium p-hydroxybenzoate (1-10 mmol 1(-1)) as sole carbon (C) sources. At a concentration of 2 mmol 1(-1), both substrates supported nitrogen fixation (acetylene reduction assay) at similar...
متن کاملNicotinic 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...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید
ثبت ناماگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید
ورودعنوان ژورنال:
- Applied and environmental microbiology
دوره 46 5 شماره
صفحات -
تاریخ انتشار 1983