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1988～1991年,在群体水培条件下,采用大穗型中籼杂交稻汕优63,设计不同生育期氮、磷处理21个,改变结实期灌浆物质的供应水平,研究稻穗上、中、下部一、二次枝梗籽粒的结实能力。结果表明:在灌浆物质供应水平较低时,不同部位籽粒的结实率、千粒重大小与开花早迟顺序一致,随着灌浆物质供应水平的提高,迟开颖花的结实率、千粒重可超过先开颖花,一、二次枝梗籽粒表现有类似趋势,证明迟开颖花的生理劣势可以转变;提高颖花根活量能明显提高稻穗不同部位籽粒的结实率和千粒重,挺高幅度一、二次枝梗籽粒均表现为下部>中部>上部,当颖花根活量达到一定程度时,迟开颖花的千粒重将高于先开颖花。
From 1988 to 1991, under large-scale hydroponic culture, large-spike hybrid rice, Shanyou 63, was designed to treat 21 varieties of nitrogen and phosphorus at different growth stages, which changed the supply level of grouting material during grain-filling period. , The lower part of the secondary fruiting ability of grain stems. The results showed that the seed setting rate and 1000-grain weight of different parts were consistent with the order of early and late flowering when the supply of grouting material was low. With the improvement of the supply of grouting material, There was a similar trend in the performance of spikelets, primary and secondary branches, indicating that the physiological disadvantage of late flowering spikes could be changed. Increasing the root activity of spikelets could obviously increase the seed setting rate and 1000-grain weight of different parts of the panicle, , The secondary branch of the grain showed lower> middle> upper, when the spruce root activity reached a certain level, the delayed-flowering thousand grain weight will be higher than the first open spike.