Nitrogen-fixation by non-heterocystous cyanobacteriain an antarctic ecosystem
2000
, KAPIL D PANDEY | , AJAI K KASHYAP | , RAJAN K GUPTA
Unicellular, non-heterocystous, diazotrophic cyanobacteria Gloeocapsa sp. isolatedfrom Schirmacher Oasis, Antarctica, showed N<SUB>2</SUB>-fixation (C<SUB>2</SUB>H<SUB>2</SUB>-reduction) whichwas comparable to that of Gloeocapsa sp. isolated from a tropical rice field. The optimum temperature of the Antarctic isolate for nitrogenase activity was 20whereas the tropical isolate expressed its maximum activity at 30supported the nitrogenase activity of both the isolates in darkness. The results indicated that the Antarctic isolate behaved differently with respect to temperature compared to the tropical isolate.
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