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        Seed Halopriming Outdo Hydropriming in Enhancing Seedling Vigor and Osmotic Stress Tolerance Potential of Rice Varieties

        Kolothodi Chandran Jisha,Jos Thomas Puthur 한국작물학회 2014 Journal of crop science and biotechnology Vol.17 No.4

        Seed priming improves the seed performance and also helps the seedlings to alleviate the detrimental effects of various stresses. Seed priming is believed to bring about some biochemical changes in the metabolism within the seed, which ultimately favors germinationand the further growth stages of the seedlings even under stressed conditions. The present investigation was carried out tostudy the effect of hydropriming and halopriming in three rice varieties (Neeraja, Vaisakh, and Vytilla 6), with varied abiotic stresstolerance potential under NaCl and PEG stress. In general, the application of both stresses, NaCl and PEG induced retardation ofgrowth and metabolism of the seedlings. However, seed priming treatments could reduce the extent of decrease in these biologicalattributes. Both hydro- and halopriming resulted in the enhancement of protein, carbohydrate, and photosynthetic pigment content,modulated antioxidant enzyme activities, reduced the lipid peroxidation of biomembranes, and enhanced the photochemistry andmitochondrial activities in rice seedlings subjected to NaCl and PEG stress as compared to non-primed ones. According to the variousmorphological, physiological, and biochemical characteristics studied in the rice seedlings raised from primed and non-primedseeds, we confirmed that both hydropriming and halopriming had a positive influence on stimulating metabolism in rice seeds, whichultimately resulted in improved seedling vigor and tolerance under NaCl and PEG stress. Halopriming was found to be more efficientthan hydropriming in enhancing the seedling vigor, overall growth, and stress tolerance potential of rice varieties

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