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Ambient temperature directly affects growth and development of rice (Oryza sativa L.), especially at the seedling stage. This study aimed to determine the effects of temperature and potassium Chloride (KCl) on certain physiological and biochemical indicators at the seedling stage of two improved rice cultivars (CR203 and DT10). Under the influence of low temperature (10°C), degradation of carbohydrates in seeds was inhibited and the total organic acid content and α-amylase activity decreased, resulting in higher starch content and lower reducing sugar content in both rice cultivars, compared to treatment at the optimal temperature (28°C). For seeds treated with KCl, the α-amylase activity and total organic acid content of the two rice cultivars increased; therefore, the reducing sugar content increased while the starch content decreased. The peroxidase and catalase activities of CR203 decreased under a low-temperature treatment, while those of DT10 increased under the same conditions. Meanwhile, treating seeds with KCl increased the peroxidase and catalase activities of both rice cultivars; however, the peroxidase activity of DT10 increased slightly. The results also suggest that low temperature inhibits the physiological activities of CR203 and DT10 at the seedling stage, while treatment of seeds with KCl increases the physiological activities of both rice cultivars. These results suggest that treating seeds with KCl contributed to improve the tolerance to low temperature stress of the CR203 and DT10 rice cultivars at the seedling stage. In general, treatment of rice seeds with KCl could be recommended to increase cold tolerance at the seedling stage.

Keywords: Catalase, cv. CR203, cv. DT10, Seed treatment.

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