Nitrate assimilatory enzymes of Spirulina (Arthospira) platensis are more thermotolerant than those of rice

In order to assess the potential of Spirulina (Arthospira) platensis as a source of abundant, thermostable nitrate assimilatory enzymes, the specific activities and thermal tolerance of nitrate reductase (NR), nitrite reductase (NiR) and glutamine synthetase (GS) were compared with those of rice in...

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Published in:Physiology and molecular biology of plants 2009-07, Vol.15 (3), p.277-280
Main Authors: Lochab, Sunila, Oberoi, Hardeep Singh, Gothwal, Monika, Abbey, Deepti, Raghuram, Nandula
Format: Article
Language:English
Subjects:
Biological and Medical Physics
Biomedical and Life Sciences
Biophysics
Cell Biology
Freshwater
Life Sciences
Oryza sativa
Plant Physiology
Plant Sciences
Short Communication
Spirulina
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Summary:In order to assess the potential of Spirulina (Arthospira) platensis as a source of abundant, thermostable nitrate assimilatory enzymes, the specific activities and thermal tolerance of nitrate reductase (NR), nitrite reductase (NiR) and glutamine synthetase (GS) were compared with those of rice in crude extracts in vitro . The results show that Spirulina enzymes have relatively higher thermotolerance. When the extracts were pre-exposed to 80 °C for 1 hr, Spirulina enzymes retained higher activities by 3.4, 1.7 and 3.7 fold, respectively than corresponding enzymes in rice. This property was not due to salts and other small proteins/molecules, as their removal by gel filtration (G-25) did not affect their thermotolerance.
ISSN:0971-5894
0974-0430
DOI:10.1007/s12298-009-0031-9