在盆栽条件下，在人工气候室模拟水稻抽穗扬花期高温热害，研究了不同时期和不同化学调控处理对水稻高温热害的缓解作用。结果表明，化学缓解处理仅在抽穗扬花前喷施时能预防高温胁迫的发生，对高温胁迫有一定的缓解效果，而在高温胁迫发生后追喷的效果不显著；选用的化学调控物质中，S诱抗素表现最好，其次为茉莉酸甲酯和磷酸二氢钾；化学调控物质缓解效应主要通过对结实率的改善来缓解高温胁迫的减产效应；化学调控处理仅对花期高温热害起缓解作用，不能完全补偿高温胁迫所产生的产量损失。

Pot experiments were conducted by simulate high temperature stress during the flowering stage in phytotron, to study the effect of chemical regulators on rice in high temperature stress. The results were as follows: alleviative effect of chemical regulators on rice only works when the chemical treatments were spraying before high temperature stress, it was invalid after the high temperature stress. Among these chemical regulators, the trans-abscisic acid performed the best alleviative effect, followed by Methyl Jasmonate and KH2PO4. The alleviative effect of chemical regulators is mainly through the improvement of seed setting rate to ease the yield loss of high temperature stress. The effect of chemical regulators is just alleviative, it can not fully recover the yield loss in  high temperature stress.