Effects Of High Temperature After Anthesis On Quality Formation And Physiological Mechanism In Wheat Varieties For Different End Uses

Wheat grain yield and quality were affected by the environment. Temperature was a major component in environmental variation and had a marked effect on grain filling in wheat. Short period of heat shock, being more than 30℃for a few days, had happenned frequently during grain filling period in many wheat-growing areas in China and several parts of the world, and had become an important factor limiting wheat yield and quality. Investigating the effects of high temperature after anthesis on quality formation and physiological mechanism was useful for understanding the mechanism of heat damage and improving wheat yield and quality under high temperature stress.Wheat growing in a pot of diameter 0.3 m, height 0.27 m, filled with 12 kg loamy soil was transferred to the artificial temperature-controlled and moisture-controlled phytotron in different days after anthesis. The experiments mainly studied effects of high temperature after anthesis on grain yield and starch and protein contents in wheat varieties for different end uses, observed starch morphology, analyzed the relationship of key enzymes involving in starch and protein synthesis with starch and protein contents, suggested the regulation measures to minimize heat damage after anthesis. The main results were as follows.