Mitigating the effects of high temperature on leaf net photosynthetic rate and grain yield by spraying two reagents

Min Li, Kaixia Ding, Qianfei Wei, Xiaohan Yin, Yulei Zhu, Jincai Li, Youhong Song*

Anhui Agricultural University, School of Agronomy, Anhui province, Hefei, 233036. Corresponding email:


High temperature in the grain-filling stage of winter wheat is one of the important meteorological disasters that has a great influence on growth characteristics and grain yield. The purpose of this study was to mitigate the effects of high temperature on wheat production by selecting useful chemical reagents and suitable spraying time. In 2017-18, wheat varieties i.e. Huaimai 33 and Annong 0711 were used to study the alleviating effects of spraying two reagents in different time periods (prior to, during and post high temperature treatment, HTT) in grain-filling stage. The Pn, SPAD, 1000-grain weight and yield of wheat under high temperature could be improved by spraying Epibrassinolide (BR) and KH2PO4, and spraying KH2PO4 had the better effect compared to BR in alleviating the harm caused by high temperature. The time to spray prior to HTT, or post has better effects compared to spray during HTT.


The Australian Society of Agronomy is the professional body for agronomists in Australia. It has approximately 500 active members drawn from government, universities, research organisations and the private sector.

Photo Credits

David Marland Photography Graham Centre for Agricultural Innovation, Charles Sturt University

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