以粳型杂交稻品种常优1号为供试材料,于抽穗开花期进行高温处理,同时设置稻清不同药剂浓度处理,研究了高温条件下喷施该药剂后水稻产量及其构成的变化,并分析了其影响机理.结果表明,高温胁迫显著降低了水稻结实率和千粒重,因而显著降低产量.无论是高温胁迫还是在常温条件下,喷施稻清均显著增加了水稻结实率和千粒重,显著增加产量.稻清处理主要通过降低穗部温度,提高颖花中抗氧化酶类活性,进而有效清除活性氧自由基等过氧化物,提高花粉粒育性、促进花药开裂和花粉粒萌发,最终提高受精结实率和粒重,显著降低高温带来的减产效应.%In order to find out the effects of the agent"Daoqing"on grain yield and its components of rice under heat stress, an ex-periment was conducted by using japonica hybrid rice Changyou 1 as material. The heat stress treatment was applied at the flowering stage, and meanwhile the agent was sprayed with different concentrations. The results showed that, heat stress significantly decreased the seed setting rate, grain weight and grain yield of rice. The agent"Daoqing" significantly increased the seed setting rate, grain weight and grain yield whether under normal or heat stress condition. The increased grain yield was mainly due to the decreased pani-cle temperature, increased activities of antioxidant enzymes, the decreased reactive oxygen species and peroxides. Moreover, the fertil-ity and germination of pollen was increased, slip of the anther was enhanced, and finally resulted in the reduced damage of heat stress to rice production.
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