The activity of glutamine synthetase gradually increased and then declined as a single-peak curve with the process of grain filling.

• 结果表明,水稻灌浆过程中籽粒谷氨酰胺合成酶活性随灌浆进程逐渐增加,达到峰值后又逐渐下降,呈单峰曲线变化;