Al3＋对小麦幼苗根系生长和膜保护酶活性的影响及Ca2＋的缓解效应

以小麦（扬麦５号）幼苗为材料，研究了铝对小麦幼苗根系生长、细胞膜脂质过氧化作用、质膜及液泡膜微囊ＡＴＰａｓｅ活性的影响和外加钙缓解Ａｌ毒的缓解效应。结果显示，在Ａｌ＾３＋胁迫下，增加Ｃａ＾２＋的供应可以减轻Ａ１＾３＋对植物的毒害，明显减轻Ａｌ＾３＋处理对根系伸长及干物质积累的抑制作用，并可减轻因Ａｌ＾３＋处理诱导的根系电解质渗漏率和 增加和过氧化氢酶（ＣＡＴ）、抗坏血酸过化物酶（ＡＰＸ）和超氧化物

The effect of Al3＋ on the growth and membrane protective enzymes a ctivity of wheat seedling roots and the mitigative effect of Ca2＋

The effect of Al3＋ on the root growth, the li pid peroxidation, the H＋-ATPase activities of plasma and tonoplast and the m itigative effect of Ca2＋ were studied using wheat cv. Rangmai 5 as mate rial. It was shown that the root growth and dry matter accumulation were interfe red, the lipid peroxidatic reaction(MDA content) and electrolyte leakage of root s were increased, the activities of CAT, APX and SOD in roots and the H＋-ATP ase activities of plasma and tonoplast from root cells were decreased under Al 3＋ treatment. At the same time, the Vmax of two H＋-ATPases were decreased and the km were increased under Al3＋ treatment. The effects of Al3＋(under 0.5 mmol/L Ca2＋ level) were mitigated by increasing Ca2＋ supply from 0.5 to 5.0 mmol／L in nutrient solution.