【摘要】 <正> 水稻谷粒灌浆过程的报道已有许多,如以往文献中指出,开花后粒位间的营养分配是不均等的,由于养料竞争和内部调节的结果,强势粒大多结实良好,而弱势粒却出现较高的不实率。与其说谷粒灌浆的早迟和充实程度与开花顺序有关,不如说与强、弱更多还原

【Abstract】 The hybrid rice "Nanyou No. 3" and its male patent variety "IR661" were used as experimental materials in 1979. Their plants were grown under natural conditions and the vigorous and weak spikelets were strictly labelled. A method for weighing was adopted, while the accumulation of dry grain weight and the formation of sterile, abortive or plump kernels were observed by stages. The result showed that the vigorous, fertilized spikelets of two varieties had rapidly gained weight after flowering, while there was only little or even no increment of weight in the weak, fertilized spikelets, nevertheless most of them still had vitality and maintained their filling ability for a long time. When the peak of weight gain of vigorous spikelets began to decline the weak spikelets started to gain weight rapidly. The filling process for the accumulation of dry weight among the vigorous and weak spikelets exhibited a so-called "Staircase" fashion.The study also showed that there was no essential difference in the grain ripenning rates between the two varieties’ vigorous spikeltes.更多还原