摘要
盐毒害作用包括渗透胁迫和离子胁迫两大类，它们都能严重影响根系和新稍的生长。Ｎａ~＋减少了质膜对Ｃａ^（＋＋）的束缚，当Ｃａ^（＋＋）向外流出增加时，Ｎａ~＋能抑制Ｃａ^（＋＋）进入胞内，并耗尽内质膜上的Ｃａ^（＋＋），这些变化表明，Ｃａ^（＋＋）的变化是根系细胞受到盐胁迫后的原初反应。盐能很快减少Ｃａ^（＋＋）向叶细胞的转运，Ｎａ~＋干扰了根系细胞内Ｃａ^（＋＋）的平衡，盐胁迫时补Ｃａ^（＋＋）能产生良好作用。
Salt toxicity comprises osmotic and ionic ocmponents。 Both of them can severely affectroot and shoot growth.Sodium reduces binding of plasma membrane to Ca++,inhibits influxwhile increasing efflux of Ca++ and depletes Ca++on endomembranes, These changes indicatedthat the changes of Ca++were the primary responses of root cells to salt stress。 Salt could re-duce the amount of Ca++ being transferred to the leaf cells。 In a short period Na+ could dis-turb Ca++homeostasis in the root cell.SupplementaI Ca++on salt stress could exert good ef-feets。
关键词
钙
盐毒害
胁迫反应
calcium
salt toxicity
stress responses
