NDLI: Isolation and Characterization of a Chlorate-Resistant Mutant (Clo-R) of the Symbiotic Cyanobacterium Nostoc ANTH: Heterocyst Formation and N2-Fixation in the Presence of Nitrate, and Evidence for Separate Nitrate and Nitrite Transport Systems

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Isolation and Characterization of a Chlorate-Resistant Mutant (Clo-R) of the Symbiotic Cyanobacterium Nostoc ANTH: Heterocyst Formation and N2-Fixation in the Presence of Nitrate, and Evidence for Separate Nitrate and Nitrite Transport Systems

Content Provider	Springer Nature Link
Author	Bhattacharya, Jyotirmoy Singh, Arvind Kumar Rai, Amar Nath
Copyright Year	2002
Abstract	Nostoc ANTH is a filamentous, heterocystous cyanobacterium capable of N2-fixation in the absence of combined nitrogen. A chlorate-resistant mutant (Clo-R) of Nostoc ANTH was isolated that differentiates heterocysts and fixes N2 in the presence of nitrate, but not in the presence of nitrite or ammonium. The mutant lacks nitrate uptake and thereby also lacks induction of nitrate reductase activity by nitrate. However, this mutant is able to transport and assimilate nitrite, indicating that there is a transport system for nitrite that is distinct from that for the nitrate. The lack of inhibitory effect of nitrate on N2-fixation was owing to lack of nitrate uptake and not to lack of enzymes for its assimilation (nitrate reductase and glutamine synthetase) or the lack of an ammonium transport system for retention of ammonia. The mutant has potential for use as a biofertilizer supplementing chemical nitrate fertilizer in rice fields, without N2-fixation being adversely affected.
Starting Page	99
Ending Page	104
Page Count	6
File Format	PDF
ISSN	03438651
Journal	Current Microbiology
Volume Number	45
Issue Number	2
e-ISSN	14320991
Language	English
Publisher	Springer-Verlag
Publisher Date	2002-08-01
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Content Type	Text
Resource Type	Article
Subject	Medicine Microbiology Applied Microbiology and Biotechnology

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