花前遮光引起小花大量退化,不孕性增加,减低了结实率。花后遮光主要影响籽粒的生长,灌浆不足或停滞。每穗结实粒数的下降以籽粒生长初期遮光影响最大。每穗粒重的下降以籽粒生长中期遮光影响较为显著。开花后,光照强度减弱,籽粒胚乳的淀粉粒数下降,胚的重量和盾状体的大小也受到抑制。 Flowers before shading caused a lot of flower degradation, increased infertility, reducing the seed setting rate. Shade after anthesis mainly affects grain growth, lack of filling or stagnation. The decrease of grain number per spike had the most influence of shading at the beginning of grain growth. Grain weight per panicle decline in mid-grain shading effect is more significant. After flowering, the light intensity weakened, the starch grains of the grain endosperm decreased, the weight of the embryo and the size of the cortical body were also inhibited.