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约为自然光强1/3-1/4的弱光分别作用于威优64和测64-7的花粉母细胞减数分裂至抽穗期(I期)和抽穗至灌浆乳熟前期(Ⅱ期)各15天,结果表明:两期弱光均可使根系活力、T/R比、光能利用率.干物质积累、灌浆速度和产量明显降低,但却使叶绿素含量下降、枝梗与颖花退化数增加、垩白度增大,至于叶面积指数则是在I期下降、在Ⅱ期上升。对于产量形成,I期主要限制“库”,Ⅱ期弱光主要限制“源”。相比之下,威优64对弱光的影响更敏感,但其优势则并未丧失。
About 1 / 3-1 / 4 of the natural light weak light were applied to Weiyou 64 and measured 64-7 pollen mother cells meiosis to heading (I) and heading to grain filling milk stage (Ⅱ ) For 15 days. The results showed that: the two periods of weak light could make root activity, T / R ratio, light energy utilization rate, dry matter accumulation, grain filling rate and yield decreased obviously, but chlorophyll content decreased, The flower degeneration number increased and the chalkiness degree increased. As for the leaf area index, it decreased in period I and rose in stage II. For the formation of production, the first phase of the main restrictions “library”, Ⅱ period weak light main constraints “source.” In contrast, Wei You 64 is more sensitive to the effects of low light, but its advantage is not lost.