中国草地学报2025，Vol.47Issue(7)：38-47,10.DOI:10.16742/j.zgcdxb.20240490
干旱胁迫下γ-氨基丁酸对紫花苜蓿幼苗生理特性的影响
Effects of γ-Aminobutyric Acid on Physiological Characteristics of Alfalfa Seedlings under Drought Stress
摘要
Abstract
To investigate the mitigation effect of externally applied γ-aminobutyric acid(GABA)on the growth of alfalfa seedlings under drought stress,this study explored five new drought-resistant alfalfa lines(P1,P2,P3,P4,and P5)and five drought-sensitive materials(15354,7657,7470,7740,and 15578).With normal water supply as the control(CK),drought stress was simulated using the previously screened stress intensity(-1.6 MPa PEG-6000).Under this drought stress treatment,exogenous GABA was applied at concentrations of 0,5,10,and 15 mmol/L(designated as T1,T2,T3,and T4,respectively)to analyze their effects on the physiological character-istics of alfalfa seedlings.Results showed that external GABA application significantly increased superoxide dis-mutase,peroxidase,catalase,leaf relative water content,and root activity in alfalfa under drought stress,while the content of proline,soluble sugar,soluble protein,malondialdehyde,hydrogen peroxide,and the production rate of superoxide anion were decreased.Membership function analysis revealed the optimal alleviation of GABA on drought-stressed alfalfa under the T3 treatment,with significantly stronger mitigation effect on sensitive genotypes compared with drought-resistant lines.The results provide a theoretical basis for the rational application of GABA in drought-tolerant cultivation of alfalfa.关键词
γ-氨基丁酸/苜蓿/干旱胁迫/生理特征/隶属函数Key words
γ-aminobutyric acid/Alfalfa/Drought stress/Physiological characteristics/Membership function分类
农业科技引用本文复制引用
杨丽丽,南丽丽,王永,陈娜,马香香,郭佳雨,任孟雨..干旱胁迫下γ-氨基丁酸对紫花苜蓿幼苗生理特性的影响[J].中国草地学报,2025,47(7):38-47,10.基金项目
国家自然科学基金项目(32160327) （32160327）
财政部和农业农村部:国家现代农业产业技术体系(CARS-34) （CARS-34）
