Effect of NaCI stress on photosynthesis characteristics and antioxidant enzymes in rice cultivars
2010
Singh, D. | Sharma, P.C.
The effect of NaCI stress 90 physiological and biochemical characteristics of salinity tolerant CSR 27 and sensitive Pusa Basmati 1 rice cultivar was studied in comparison with CSRI0. Thirty-five days old seedling was transplanted in earthen pots with three ievel of salinity stress (0, 6.0 and 12.0 dSm-1) treatment. Observation were recorded for the rate of photosyntnesis (P N) chlorophyll content, relative water content (RWC) and antioxidant enzymes viz. Superoxide dismutase (SOD) and Catalase (CAT) were determiiied at 35 and 65 days after traqsplanting. Rate of photosynthesis and chlorophyll content Ireased marginally by NaCI stress in CSR 27 and CSR 10 but Basmati 1 showed greater reduction. CSR 10 and CSR 27 maintained higher RWC under NaCI str,ess compared to sensitive Pusa Basmati 1. SOD activity was highly induced umfer NaCI stress in CSRI0 but CAT activity decreased. In CSR 27, induction of SOD and CAT activities was higher than that of Pusa Basmati 1. The results indicate that maintenance of higher RWC and induction SOD activity under NaCI stress in CSR 27 contributed to its salt tolerant characteristics.
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