粒粒饱对水稻灌浆期间衰老的延缓作用

于水稻初穗期施用二元植物生长物质粒粒饱，就其延缓水稻灌浆成熟期衰老进程的作用进行了研究。粒粒饱对稻株灌浆成熟期延缓衰老作用明显，对易发生早衰的籼型三系杂交稻效应尤其显著。在黄熟期观察，功能叶片的SOD活性比对照高1.9倍，MDA含量比对照低30%，根系伤流量比对照高约1倍。粒粒饱延缓稻株衰老的效应似可分成对产量形成的直接效应和间接效应两类，直接效应是提高籽粒呼吸强度，间接效应是延缓功能叶片 SOD 活性和根系伤流液的下降。

The Delay Function on Senescence of Lilibao During Rice Grain Filling Stage

When Lilibao, a plant growth substance containing GA 3 and PP 333 , was applied to rice plant at initial heading stage, the delay function on senescence of rice plant was significant especially in some hybrid combinations which were easy to senescence during filling stage. The delay function on senescence could be divided into two types in helpful effect on grain yield, one is directly helpful in increasing respiration rate of grain,another is indirectly in retarding decrease of SOD activity, and root exudate during filling stage.