60年代初殷宏章等在稻麦群体研究中曾注意到穗对群体光能利用的影响,指出小麦穗直立遮光面积小,而且有利自身的光合作用,水稻灌浆中后期消光系数升高可能与穗逐渐弯垂有关。后来有报道支持上述观点,但也有人认为穗弯曲,剑叶伸出穗层以上可避免穗对群体光能利用的不利影响。过去生产上的品种都是弯穗的,人们对这个问题没有继续深入研究。80年代初育成的著名高产品种辽粳5号,在株型上的重要特点是穗象小麦一样直到成熟都保持直立状态。辽粳5号的产量潜力高是否与穗直立有关?穗的直立性问题又重新引起人们的重视,但对其评价仍然是褒贬不一,具体研究很少。水稻穗本身的光合能力远低于小麦,可视为非同化器官,因此穗可能是通过群体生态环境影响群体光合作用和物质生产,进而影响产量的。本文对此进行了初步研究。 In the early 1960s, Yin Hongzhang et al. Had noticed the effect of spike on the light energy utilization of the population in the study of rice and wheat populations. It was pointed out that the spike of wheat was small and its photosynthesis was favorable. The increase of extinction coefficient in the late grain filling stage might be related to the spike Gradually bent over the relevant. Later, some reports support this view. However, some people think that the bending of the ear and the extension of the flag above the ear layer can prevent the ear from adversely affecting the utilization of light energy of the population. In the past, the varieties of production were bent ears, people did not continue to study this issue in depth. The well-known high-yielding cultivar Liaojing 5, bred in the early 1980’s, is an important feature of the plant type that spikes like wheat until its maturity. Whether the high yield potential of Liaojing 5 is related to spike upright? The erectness of spike has aroused people’s attention again, but its evaluation is still mixed, with few specific studies. The photosynthetic capacity of rice panicle itself is much lower than that of wheat, which can be considered as non-assimilated organs. Therefore, panicle may affect the photosynthesis and material production of the population through population ecology, thus affecting yield. This article has carried on the preliminary research to this.