钙提高玉米种子活力的作用研究

本文以玉米种子为材料，研究了钙对种子活力的影响．在０—４０ｍｍｏｌ／ＬＣａ（２＋）的浓度范围，低浓度的Ｃａ（２＋）提高种子的发芽率和活力，最适浓度为１０ｍｍｏｌ／Ｌ，超过此浓度Ｃａ（２＋）的促进作用减弱．Ｃａ（２＋）提高种子发芽率和活力的原因可能是Ｃａ（２＋）促进胚和胚乳中α－和β－淀粉酶的活性，加速胚乳中贮藏物质如淀粉和可溶性蛋白的动员．在种子萌发过程中，ＥＧＴＡ和ＥＤＴＡ能降低种子活力，２．５和１０ｍｍｏｌ／ＬＣａ（２＋）能部分解除ＥＧＴＡ和ＥＤＴＡ的抑制作用．

SEED VIGOR OF ZEA MAYS L. IMPROVED BY CALCIUM

The effect of calcium on vigor of Zea mays L. seeds was studied. When seeds were treated with 0-10mmol/L concentrations of CaCl2, the germination percentage and vigor of seeds were increased. As Ca2+ concentration was more than 10mmol/L,the effects on seed viability and vigor decreased. The reasons that Ca2+ raised germination percentage and vigor of seeds might be due to the enhancing activities of amylases in embryo and endosperm,and the accelerating mobilization of stored reserves,e.g.starch and soluble proteins in endosperm. During seed germination, the exogenous EGTA and EDTA could drop seed vigor, but this inhibitory effect was partially removed by the addition of 2.5 and 10mmol/L Ca 2+.