Effects of Exogenous γ-aminobutyric Acid on Grain Nitrogen Formation and Yield in Cold-region Japonica Rice under Drought Stress at Booting Stage

doi:10.7668/hbnxb.2018.05.029

Abstract

Abstract: To investigate the regulation effect of exogenous γ-GABA on the formation of nitrogen and yield of Japonica rice in cold region under drought stress at booting stage,Dongnong 425 and Songjing 6 were used as experimental materials,and 6 GABA concentrations(0,0.25,0.50,1.00,2.00 and 4.00 mmol/L)were set up. The effects of exogenous GABA on dry matter amount,total nitrogen content and activity of nitrogen metabolism enzyme of Japonica rice were analyzed under drought stress at booting stage with normal irrigation as control(CK). The results showed that compared with the control,the yield and the yield components,dry matter accumulation of grains(in addition to 7 days after full bloom)decreased significantly,the activity of straw transaminase(GOT)and glutamine pyruvic transaminase(GPT)decreased,the activity of glutamine synthetase(GS)increased(7 and 14 days after full bloom),the content of total nitrogen(in addition to 21-35 days after panicle of Songjing 6)and endogenous GABA increased significantly. Compared with the drought treatment,using different concentrations of GABA could significantly improve grain yield,yield components and dry matter accumulation of grains,nitrogen metabolism key enzyme activity,total nitrogen and endogenous GABA content,and with the increased of GABA concentration. The yield and yield components of Dongnong 425 and Songjing 6,and the accumulation of grain dry matter quality,the activities of nitrogen metabolism key enzymes,and the content of total nitrogen and endogenous GABA increased first and then decreased. And the optimum concentrations of exogenous GABA in Dongnong 425 and Songjing 6 sprayed by drought stress at booting stage were 0.54,1.22 mmol/L.

Key words: Japonica, Booting stage, Drought stress, γ-aminobutyric acid, Nitrogen metabolism, Yield

CLC Number:

GU Haitao, JIA Yan, ZHANG Bo, SUN Bin, WANG Zhuoqian, ZHAO Hongwei. Effects of Exogenous γ-aminobutyric Acid on Grain Nitrogen Formation and Yield in Cold-region Japonica Rice under Drought Stress at Booting Stage[J]. ACTA AGRICULTURAE BOREALI-SINICA, 2018, 33(5): 209-217. doi: 10.7668/hbnxb.2018.05.029.

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