【摘要】 外界Ｋ~＋水平对水稻幼苗耐盐性的影响晏斌，戴秋杰（江苏省农业科学院，南京２１００１４）ＥｆｆｅｃｔｏｆＥｘｔｅｒｎａｌＫ~＋ＬｅｖｅｌｏｎＳａｌｔＴｏｌｅｒａｎｃｅｏｆＲｉｃｅＳｅｅｄｌｉｎｇｓ￥ＹＡＮＢｉｎ，ＤＡＩＱｉｕｊｉｅ（ＪｉａｎｇｓｕＡｃａｄ...更多还原

【Abstract】 This study was conducted to determine effect of external K+ on rice salt tolerances under NaCl (0.5% or 86 mmol/L) stress. The rice seedlings were grown in the greenhouse for 1 5 days and then stressed with cultural solutions containing Na/K ratios of 5, 10, 50, 100, 369, and 0.5% KCl. The dry weight was decreased more under 0.5% KCl than under 0.5% NaCl. The addition of KCl to 0.5% NaCl solutions significantly minimized Na+ content in the plants, the total amount of (Na++K+) in the shoots, as well as the net rate of Na+ transport from root to shoot, and increased K+in saline mediums significantly reduced membrane premeability of the roots and leaves, and enhanced plasmalemma ATPase activity of the roots. The results indicated that high external K+level can improve salt tolerance of rice seedling. However, ameliorative effects of potassium were related with external Na/K ratio. Lower ratio aggravated the salinity injury. The optimum Na/K ratios which enhance s4lt tolerance were 10 and 50.更多还原