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