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| Relationship between Adaptability of Nitrate Reductase to NaCl Stress and Substance Metabolism in Green Alga Dunaliella salina |
| ZHOU Xu,YANG Xiao-ling,GUO Jin-yao |
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Abstract The physiological changes were determined in green alga Dunaliella salina cultivated under various NaCl stress to evaluate the relationship between adaptability of nitrate reductase (NR) to NaCl stress and the substance metabolism in the alga under different salinities .The results showed that the NR activity was positively correlated with NaCl concentration within NaCl concentration from 40 g/L to 120 g/L ,but the NR activity was negatively correlated with NaCl level within the NaCl concentration from 120 g/L to 200 g/L ,with the maximal NR activity at NaCl concentration of 120 g/L ,indicating that the NR in D .salinais a kind of enzymes which can adapt well to NaCl stress .The NR activity in the green alga was shown to have a positive relationship with cell density , chlorophyll formation , and accumulation of protein ,the maximal substance accumulation being observed at the maximal NR activity .
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Received: 25 February 2014
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