外源GABA对NaCl胁迫下垂穗披碱草种子萌发及幼苗生理特性的影响

本研究以垂穗披碱草(Elymus nutans)为研究对象,探究了外源 γ-氨基丁酸(7-aminobutyric acid,GABA)对NaCl胁迫下垂穗披碱草种子的萌发和幼苗生理特性的影响,对盐碱地的开发利用和盐渍化草地的生态修复具有重要意义.研究结果表明,100 mmol·L-1 NaCl盐胁迫抑制了垂穗披碱草种...

Effects of Exogenous GABA on Seed Germination and Physiological Characteristics of Elymus nutans under NaCl Stress

In this study,Elymus nutans was taken as the research object to explore the effects of exogenousγ-Aminobutyric acid(GABA)on seed germination and seedling physiological characteristics of Elymus nutans under NaCl stress,which was of great significance for the development and utilization of saline alkali land and the ecological restoration of saline grassland.The results showed that 100 mmol·L^-1 NaCl salt stress inhibited the seed germination and seedling growth of Elymus nutans.Under salt stress,the addition of 0.05~2.00 mmol·L^-1GABA promoted the seed germination and seedling growth of Elymus nutans.The average increase of germination potential and germination ratio under different concentrations of GABA was 109.77%and 19.48%,respectively,compared with salt stress.Under salt stress,the addition of 0.05~2.00 mmol·L^-1GABA treatment significantly increased the soluble sugar,soluble protein,proline content and antioxidant enzyme activity of Elymus nutans seedlings,and reduced malondialdehyde(MDA)content,thereby effectively reduced the oxidative damage caused by NaCl stress and improved the salt tolerance during the germination of Elymus nutans seeds.The comprehensive evaluation showed that the addition of 0.5 mmol·L^-1 exogenous GABA had the best effect on promoting seed germination and seedling growth of Elymus nutans under NaCl stress,and improved the salt resistance of Elymus nutans at the germination stage.