Organization and Regulation of Nitrogen Fixation Genes

1993 ◽  
pp. 43-54 ◽  
Author(s):  
M. J. Merrick
Keyword(s):  
Nitrogen Fixation ◽  
Nitrogen Fixation Genes

Expression of the nodulation and nitrogen fixation genes in Rhizobium meliloti during development

Genome ◽  
1989 ◽  
Vol 31 (1) ◽  
pp. 354-360 ◽  
Author(s):  
San Chiun Shen ◽  
Shui Ping Wang ◽  
Guan Qiao Yu ◽  
Jia Bi Zhu
Keyword(s):  
Nitrogen Fixation ◽  
Rhizobium Meliloti ◽  
Abnormal Development ◽  
Wild Type ◽  
Free Living ◽  
Nod Genes ◽  
Nodule Initiation ◽  
Fix Genes ◽  
Nitrogen Fixation Genes

Genes that specify nodulation (nod genes) are only active in the free-living rhizobia or in the nodule initiation state of rhizobia. As soon as the repression of nod genes occurs in the bacteroids of the nodule, nifA is induced, while ntrC is inactivated and thus the nifA-mediated nif/fix genes are turned on. Limitation of available oxygen brings about the induction of nifA, which reflects the actual status of nif/fix gene activities in symbiotic state of rhizobia. Oxygen thus appears to be a major symbiotic signal to the expression of bacteroid nif/fix genes. Mutation of nifA or shortage of nifA product in wild-type rhizobia caused by the inhibition of multicopy nifH/fixA promoters leads to an abnormal development of nodules and premature degradation of bacteroids in nodules.Key words: nitrogen fixation, nodulation, nif/fix regulation, nifA mutant.

scholarly journals Diversity of heterotrophic nitrogen fixation genes in a marine cyanobacterial mat.

1995 ◽  
Vol 61 (7) ◽  
pp. 2527-2532 ◽  
Author(s):  
J P Zehr ◽  
M Mellon ◽  
S Braun ◽  
W Litaker ◽  
T Steppe ◽  
...  
Keyword(s):  
Nitrogen Fixation ◽  
Cyanobacterial Mat ◽  
Nitrogen Fixation Genes

The Nitrogen Fixation Genes

Nature ◽  
1972 ◽  
Vol 239 (5374) ◽  
pp. 495-499 ◽  
Author(s):  
STANLEY L. STREICHER ◽  
ELIZABETH G. GURNEY ◽  
RAYMOND C. VALENTINE
Keyword(s):  
Nitrogen Fixation ◽  
Nitrogen Fixation Genes
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