谷氨酰胺合成酶活性与水稻杂种优势预测

GLUTAMINE SYNTHETASE ACTIVITY AND RICE HETEROSIS PREDICTION

从杂种优势预测生理指标需具备的３个基本条件入手，对杂交水稻及其亲本生长发育过程中的谷氨酰胺合成酶（ＧＳ，ＥＣ６、３、１、２）活性进行研究，结果表明：水稻ＧＳ活性在整个生育期中的变化呈现一定的规律性，并且杂种酶活性是由其双亲遗传性所决定的；同时，ＧＳ活性与多个生理性状及产量性状具有一定的相关性；在孕穗期和抽穗期与产量性状的关系尤为密切，因此，在生殖生长期ＧＳ活性在一定程度上可以反映产量性状的优势水平，可望作为水稻杂种优势预测的一个辅助指标。

Changes of GS activity of hybrid rice and their parent dnring growth and development were same in order,and the enzyme activity level of hybrid rice is the result of inheritance of their parent.There were significant relationship between GS activities and several physiological and yield characters,cspecially at panicle initial stage and heading stage.Thus,we suggested that GS activity is probably as a physiological parameter of which predict heterosis level of yield character to some extent at reproductive growth stage.