Effects of Spraying GA3 on Flower and Pod Endogenous Hormones and Yield Component Factors of Alfalfa
MA Xue-yao, SUI Xiao-qing, LI Jun-ming, ZHANG Bo
Xinjiang Key Laboratory of Grassland Resources and Ecology, College of Grassland and Environmental Sciences, Xinjiang Agricultural University, Urumqi, Xinjiang 830052, China
Abstract:Taking alfalfa (Medicago sativa L. ‘XinMu No.4’) as a test object,the plant growth regulator GA3 (gibberellin) was sprayed at different growth stages of alfalfa to investigate how the GA3 affect endogenous hormone content in flower and pod,seed yield components and pod setting rate. The results showed that:in the budding stage,the endogenous hormones GA3 and ZR(zeatin riboside) contained in flower and pod were decreased significantly (P<0.05) after 100 mg·L-1 GA3 was sprayed on the leaf surface of alfalfa,but it has little effect on the content of ABA(abscisic acid) and IAA(auxin). In the early flowering stage,the endogenous hormones GA3 and IAA contained in flower and pod increased significantly(P<0.05) under the same experimental treatment,but the content of ABA and ZR were not the case. In the full flowering stage,the content of IAA decreased significantly(P<0.05) but GA3,ABA,ZR did not. In the podding stage,the content of IAA and ZR decreased significantly(P<0.05) but GA3 and ABA did not. The comprehensive analysis of grey correlation degree between yield components and seed yield indicated that the comprehensive score of full flowering stage treatment was the highest,and the thousandseed weight and pod setting rate were the main factors affecting seed yield. The treatment of spraying 100 mg/L GA3 on leaves had little influence on alfalfa yield components. However,Spraying in the budding stage had a greater effect onseed yield,which was 48.24% lower than that of the control group. In conclusion,the suitable period for GA3 spraying is the fullbloom stage,and low concentration spraying is recommended in alfalfa seed production.
马雪瑶, 隋晓青, 李俊明, 张博. 叶面喷施GA3对紫花苜蓿花荚内源激素及种子产量构成的影响[J]. 草地学报, 2020, 28(5): 1294-1300.
MA Xue-yao, SUI Xiao-qing, LI Jun-ming, ZHANG Bo. Effects of Spraying GA3 on Flower and Pod Endogenous Hormones and Yield Component Factors of Alfalfa. Acta Agrestia Sinica, 2020, 28(5): 1294-1300.
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