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选用1个常规香稻品种和1个杂交香稻组合,通过人工气候室控温的方法,研究了高温处理(日均温30℃)和适温处理(日均温23℃)对产量及其构成的影响,并进一步从光合作用和碳水化合物积累的角度对其生理机制进行了分析研究。结果表明:灌浆结实期高温使新香占和优杂五山香的结实率、实粒数显著降低,虽千粒重稍有增加,但最终表现为产量极显著下降,分别比适温处理下降了22.8%和29.9%;香稻子粒灌浆中后期,高温处理显著降低了剑叶的叶绿素含量和净光合速率,使产量形成的“源”明显不足,同时子粒中可溶性糖的含量和淀粉的积累速率明显下降,使产量形成的“库”显著变弱。
A conventional combination of aromatic rice and a hybrid of aromatic rice was selected to study the effect of high temperature treatment (average daily temperature 30 ℃) and proper temperature treatment (daily average temperature 23 ℃) on the yield and its Structure and further from the perspective of photosynthesis and carbohydrate accumulation of its physiological mechanism were analyzed. The results showed that the seed-setting rate and grain-filling rate of Xinxiangzhan and Gushanxiang were significantly decreased with the increase of grain-filling temperature. Although the grain weight increased slightly, the yield was extremely significantly decreased by 22.8% And 29.9%, respectively. During the middle and late stage of high grain filling, the chlorophyll content and net photosynthesis rate of flag leaf were significantly decreased, which led to the obvious deficiency of “source” of grain yield. At the same time, the soluble sugar content and starch accumulation rate Significant decline, the formation of the “library” significantly weakened.