关键词: 玉米, 脱落酸, 籽粒灌浆参数, 籽粒含水率, 籽粒脱水

Abstract: Xianyu 335, Dika 517 with fast dehydration rate and Liyu 16, Zhengdan 1002 with slow dehydration rate were used as materials, the effects of exogenous ABA on maize yield, filling characteristics and water content of grain were studied,and the relationship between grain water content and grain filling characteristic parameters was studied,so as to lay a foundation for further exploring effective control measures to reduce water content of grain in the filling process. The results showed that the maize yield decreased after spaying ABA because of decrease of 100-grain weight,which of 40 mg/L ABA and 80 mg/L ABA treatments decreased by 2.67% and 16.42% respectively compared with CK without ABA. After spaying ABA, the initial filling potential increased, which of 40 mg/L ABA and 80 mg/L ABA treatments increased by 20.03% and 32.26% respectively compared with CK, the maximum filling rate appeared 0.29—0.89 d later than CK,the grain weight when the maximum filling rate appeared decreased,the average filling rate decreased,and the active filling period prolonged.The grain water content increased after spraying ABA at each filling stage,the increase effect on the fastly dehydrated maize variety was stronger than that on the slowly dehydrated maize variety.There was a extremely significant positive correlation between the time when the maximum grain filling rate appeared and grain water content. Overall,spraying exogenous ABA inhibited filling process,and increased grain water content,especially for fastly dehydrated maize variety.

Key words: Maize, Abscisic acid(ABA), Grain filling parameters, Moisture content of grain, Dehydration of grain