Determination of salinity tolerant potential of Indigenous landrace and white rice variety

The purpose of this study was to evaluate how salt stress affected the activity of antioxidant enzymes in rice plants. The improved cultivar of White Ponni and the conventional cultivar of Kalundai were the two genotypes used in the experiment, which had a factorial design, complete randomization, three replicates, and five salt levels (0, 50, 100, 150, and 200 mM NaCl). Catalase (CAT) and superoxide dismutase (SOD), two antioxidant enzymes, as well as the total soluble protein content, physiological characteristics, and chlorophyll content were all measured. While the White Ponni cultivar's CAT and SOD activities showed no discernible trend, the activity of all examined enzymes in the Kalundai cultivar rose with increasing salt stress treatments Regression analysis results for antioxidant enzymes in the kalundai cultivar revealed a strong relationship between salt stress levels and antioxidant enzymes. In contrast, the correlation between CAT and SOD activity was modest in the white ponni cultivar. In summary, the current study's findings showed that the newly produced cultivar of white ponni was less resistant to salt stress than the Kalundai cultivar