Abstract
Salinity induced physiological changes were investigated in two BC2F6–7 high yielding rice introgression lines (ILs) derived from advanced backcross populations of O. sativa (IR58025A/KMR3) × O. rufipogon. Plants were subjected to 150 mM NaCl treatment throughout the germination stage to early seedling stage for 10 days. The study revealed high root bleeding rate in K 198 under NaCl stress. The shoot length and dry weight reduction over control was drastic in K 198 under 150 mM NaCl treatment. Analysis of Na+ ion depicted ion exclusion mechanism in K 478 and high accumulation in K 198 when exposed to high concentration of NaCl. Significant differences were noticed in the activity of antioxidant enzymes amongst the introgression lines. Superoxide dismutase and ascorbate peroxidase activity increased in both introgression lines but the increase was more significant in K 478 under salinity (150 mM NaCl) condition. Catalase activity decreased under stress in both introgression lines. Activity of peroxidase increased in both ILs but K 478 showed significantly high activity. Our study on early seedling growth, accumulation of Na+ and activities of antioxidant enzymes indicated that the introgression line K 478 was considerably tolerant to salinity stress and this high yielding introgression line would further be used in developing salinity tolerant varieties.
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