NaCl胁迫对玉米幼苗渗透调节物质及Na^+、K^+、Ca^(2+)含量的影响

Effects of NaCl Stress on Osmosis-regulating Substance and Na^+、K^+、Ca^(2+) Contents of Maize Seedling

以耐盐(天塔3号)和盐敏感(齐单1号)玉米为材料,通过砂培法研究其在0、0.2%、0.4%、0.6%、0.8%、1.0%NaCl胁迫15 d的生长指标、有机渗透调节物质含量和Na+、K+、Ca2+含量的变化。结果表明,随着NaCl浓度的增加,玉米幼苗脯氨酸、丙二醛、可溶性蛋白质、地上部分和根系的Na+含量、地上部和根部Na+/K+逐渐增加;叶绿素a、类胡萝卜素含量、地上部K+含量、地上部和根系的Ca2+含量均逐渐降低;天塔3号脯氨酸和可溶性蛋白质含量的增加幅度较齐单1号要高于对照,齐单1号根系K+含量下降幅度小于天塔3号,齐单1号地上部Ca2+含量下降幅度大于天塔3号,天塔3号幼苗地上部Na+/K+升高的幅度低于齐单1号。以上数据表明,耐盐性不同的玉米幼苗渗透调节物质含量、地上部和根部的离子含量、离子比值,及其对盐胁迫的响应是不完全相同的。

To study the salttolerance mechanism of salttolerant and saltsensitive maize, we determined thegrowth parameters, osmosisregulating substance contents and Na^＋ , K^＋ , Ca^2＋ cation contents of maize whichhave been growing for 15 d under 0,0.2% ,0.4% ,0.6% ,0.8% , 1. 0% NaCl stress. The results showed that the content of proline, MDA, soluble proteins, Na^＋ content and Na^＋/K^＋ in shoots and roots of two varieties gradually increased, but the contents of chlorophyll a, carotenoid, K^＋ contents in shoots and Ca^2＋ in shoots and roots decreased with elevated salt treatment. The contents of proline and soluble proteins in Tianta 3 were increased higher compared to Qidan 1 under salt stress. K^＋ content of Tianta 3 in roots decreased lower than Qidan 1, but Ca^2＋ content of Qidan 1 in shoots decreased higher than Tianta 3. K^＋/Na^＋ in shoots of Tianta 3 was increased higher than Qidan 1. These results showed that osmosisregulating substance contents, the cation contents in shoots and roots, the ratio of Na^＋/K^＋ and Na^＋/Ca^2＋ , the response to salt stress were different in saltresistance and saltsensitive varieties of maize.