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选用千粒重大小不同的小麦品种，研究了去除顶端两个小穗对两类品种（大粒品种和小粒品种）穗部性状、籽粒平均灌浆速率、单穗平均增重速率、植株光合速率及１４Ｃ同化物运输分配的影响。试验结果表明，去除顶端两个小穗后，两类品种的籽粒平均灌浆速率和单穗平均增重速率（分别表征籽粒库容活性和穗粒库容活性）相应提高，穗粒重表现为补偿性增长。两类品种比较，小粒品种的增长幅度大于大粒品种。穗粒库容活性增强使得小粒品种灌浆中后期的植株光合速率提高，使两类品种分配到籽粒中的１４Ｃ同化物比例增加。从而表明，无论是植株光合速率还是同化物的运转分配皆受库容活性的调控，调控方式和幅度因品种类型而不同。
The effects of removal of top two spikelets on panicle traits, average grain filling rate, average weight gain per panicle, photosynthetic rate and 14C assimilation of two types of cultivars (large grain and small grain) Impact of transport distribution. The results showed that after removing the top two spikelets, the average grain filling rate and the average weight gain per panicle (representing the grain storage activity and the grain storage activity respectively) increased correspondingly, and the spikelet weight showed compensatory growth . Comparison of two types of varieties, the growth of small varieties larger than large grain varieties. Increased grain storage activity increased the rate of photosynthesis in the middle and late grain filling stages of small grains, resulting in an increased proportion of 14C assimilates assigned to the grains for both varieties. Thus, both the photosynthetic rate of plants and the assimilation of operational distribution are controlled by the capacity of the storage capacity, control methods and the magnitude of different types of varieties.