In order to systematically analyzed the effects of heat stress on yield components and rice quality during heading stage,eight rice varieties widely planted in Jiangxi province were used as materials,and the differences of heading time,panicle characteristics,yield components and rice quality among different rice varieties were measured under heat stress(38 ℃/32 ℃,day/night)at heading stage.The results showed that heat stress during heading stage induced the shortened of heading time,panicle development was inhibited,panicle length and panicle weight decreased significantly.Heat stress caused yield loss by 27.44％-40.33％among different rice varieties,respectively,and the 1000-grain weight was the largest decline index of yield components under heat stress.Heat stress caused decrease of the contents of starch and sucrose,as well the rates of brown rice,milled rice and head rice,while the contents of glucose and fructose,chalky kernel and chalkiness were significantly increased induced by heat stress.The yield loss of Huanghuazhan and Xiangliangyou 900 were less than other rice varieties under heat stress during heading stage,which was expressed by smaller shortened of heading time,higher panicle length,panicle weight and more spikelets,as well as smaller decline of the starch and sucrose content.The yield loss of Yuewangsimiao and Xiangliangyou 2 were more than other rice varieties under heat stress.The resistance coefficient in multiple indices of each rice variety was highly consistent with the yield loss under heat stress.Taken together,there was consistency of effects induced by heat stress between yield formation and rice quality,which indicated that rice varieties with higher yield loss suffered from severe effects in rice quality induced by heat stress.
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