稻穗的产量一部分来自抽穗前的贮藏物质,另一部分来源于抽穗后直接生产的光合产物,两者对穗干物质积累的作用因品种而异。一些研究认为,杂交水稻前期总光合势迅速增加,导致干物质生产与积累表现优势,净同化率优势前期明显,后期消失;而另一些研究则认为,高产水稻品种的产量潜力 The part of rice yield comes from the pre-heading storage material and the other part comes from the photosynthate produced directly after heading. The effect of the two on ear dry matter accumulation varies from species to species. Some studies suggest that the rapid increase of total photosynthetic potential in early hybrid rice leads to the superiority of dry matter production and accumulation. The net assimilation rate has obvious advantages in the early stage and disappears in the late stage. However, other researches believe that the yield potential of high-yielding rice cultivars