Nitrogen fixation by Azospirillum brasilense isolated from rice fields of Bangladesh

1996 ◽  
pp. 203-207 ◽  
Author(s):  
Zahed U. M. Khan ◽  
M. A. Akond
Keyword(s):  
Nitrogen Fixation ◽  
Azospirillum Brasilense ◽  
Rice Fields

scholarly journals Potential of Phototrophic Purple Nonsulfur Bacteria to Fix Nitrogen in Rice Fields

2021 ◽  
Vol 10 (1) ◽  
pp. 28
Author(s):  
Isamu Maeda
Keyword(s):  
Nitrogen Fixation ◽  
Regulatory Networks ◽  
Nitrogenase Activity ◽  
Field Studies ◽  
Rice Fields ◽  
Purple Nonsulfur Bacteria ◽  
Available Nitrogen ◽  
Nitrogenase Activities ◽  
Plant Available Nitrogen ◽  
Biological Nitrogen

Biological nitrogen fixation catalyzed by Mo-nitrogenase of symbiotic diazotrophs has attracted interest because its potential to supply plant-available nitrogen offers an alternative way of using chemical fertilizers for sustainable agriculture. Phototrophic purple nonsulfur bacteria (PNSB) diazotrophically grow under light anaerobic conditions and can be isolated from photic and microaerobic zones of rice fields. Therefore, PNSB as asymbiotic diazotrophs contribute to nitrogen fixation in rice fields. An attempt to measure nitrogen in the oxidized surface layer of paddy soil estimates that approximately 6–8 kg N/ha/year might be accumulated by phototrophic microorganisms. Species of PNSB possess one of or both alternative nitrogenases, V-nitrogenase and Fe-nitrogenase, which are found in asymbiotic diazotrophs, in addition to Mo-nitrogenase. The regulatory networks control nitrogenase activity in response to ammonium, molecular oxygen, and light irradiation. Laboratory and field studies have revealed effectiveness of PNSB inoculation to rice cultures on increases of nitrogen gain, plant growth, and/or grain yield. In this review, properties of the nitrogenase isozymes and regulation of nitrogenase activities in PNSB are described, and research challenges and potential of PNSB inoculation to rice cultures are discussed from a viewpoint of their applications as nitrogen biofertilizer.

Nitrogen Fixation and Nitrate Respiration by A zospirillum brasilense

1983 ◽  
Vol 38 (7-8) ◽  
pp. 571-577 ◽  
Author(s):  
Hermann Bothe ◽  
Gislene Barbosa ◽  
Johanna Dobereiner
Keyword(s):  
Nitrogen Fixation ◽  
Nitrate Reduction ◽  
Azospirillum Brasilense ◽  
Nitrate Respiration ◽  
Present Communication ◽  
Reaction Proceeding ◽  
Physiological Properties ◽  
Assimilatory Nitrate Reduction

The O2- sensitivitiy of N2-fixation by the carotenoid forming strain Azospirillum brasilense Cd and the colourless strain Sp 7 is compared in the present communication. As no difference in the reaction is observed with both strains, it is concluded that carotenoids do not protect nitrogenase from damage by O2. Azospirillum spp. have also been shown to perform NO3-- dependent N2-fixation. The physiological properties of this reaction are described in more detail in the present communication. Evidence is presented that NO3-- dependent N2-fixation is a transitory reaction, proceeding only as long as the enzymes of assimilatory nitrate reduction are synthesized by the cells.

Growth and Nitrogen Fixation of Mixed Cultures of Azospirillum Brasilense and Arthrobacter Giacomelloi

1984 ◽  
pp. 329-329 ◽  
Author(s):  
I. Cacciari ◽  
D. Lippi ◽  
S. Ippoliti ◽  
M. Del Gallo ◽  
T. Pietrosanti ◽  
...  
Keyword(s):  
Nitrogen Fixation ◽  
Azospirillum Brasilense ◽  
Mixed Cultures

Regulation of nitrogen fixation in Azospirillum brasilense Sp7: Involvement of nifA, glnA and glnB gene products

1992 ◽  
Vol 100 (1-3) ◽  
pp. 113-119 ◽  
Author(s):  
Yao Yun Liang ◽  
Miklos Zamaroczy ◽  
Florence Arsene ◽  
Annick Paquelin ◽  
Claudine Elmerich
Keyword(s):  
Nitrogen Fixation ◽  
Azospirillum Brasilense ◽  
Gene Products ◽  
Azospirillum Brasilense Sp7
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