作　　者： ; ;

机构地区： 中山大学生命科学学院

出　　处： 《杂交水稻》 1997年第6期23-25,共3页

摘　　要： 以叶绿素、蛋白质含量为衰老的生理指标，研究了不同ｐＨ、Ｃａ２＋对杂交水稻叶片衰老的作用。结果表明，不同ｐＨ影响叶绿素和蛋白质含量，最适ｐＨ为６．０；此条件下的Ｃａ２＋浓度为０．０１～２０．００ｍｍｏｌ／ｌ，低浓度的Ｃａ２＋提高叶片中叶绿素和蛋白质含量，提高超氧化物歧化酶（ＳＯＤ）、过氧化氢酶（ＣＡＴ）、过氧化物酶（ＰＯＤ）活性，降低丙二醛（ＭＤＡ）含量；随着Ｃａ２＋浓度升高，则作用减弱；最适浓度为０．１ｍｍｏｌ／ｌ。Ｃａ２＋能延缓杂交水稻叶片的衰老，主要原因是由于Ｃａ２＋能提高叶片中活性氧防御酶的活性，降低活性氧的伤害作用。 Effects of different pH values and Ca 2+ concentrations at optimal pH on senescence of the detached leaves of the hybrid rice combination Shanyou 63 were studied using chlorophyll and soluble protein contents as the physiological indexes. The results showed that the contents of chlorophyll and soluble protein varied with the values of pH. The optimal pH value was 6.0. Under the optimal pH conditions, chlorophyll and soluble protein contents varied with Ca 2+ concentrations. In the range of 0.01～20.00 m mol/l tested concentrations, activities of superoxide dismutase (SOD), peroxidase (POD), catalase (CAT) were increased and the content of malondialdehyde (MDA) was decreased at lower Ca 2+ concentrations and the optimal Ca 2+ concentration was 0.1 m mol/l. The main reason why Ca 2+ can postpone the senescence of hybrid rice leaves was that Ca 2+ can increase the activities of the protective enzymes and decrease damages of active oxygen in the leaves of hybrid rice.

关 键 词： 叶片衰老 杂交水稻 钙

领　　域： [农业科学]