γ-氨基丁酸对小麦耐盐性的影响

[目的]探究盐胁迫条件下γ-氨基丁酸(GABA)对小麦中光合活性和抗氧化活性的影响,进而揭示GABA提高小麦耐盐性的作用机理.[方法]测定不同浓度梯度GABA处理盐胁迫下小麦萌发幼苗的各生理参数,包括气体交换、光合作用量子产量、光合色素、抗氧化酶活性、丙二醛含量和相对电解质渗漏等,并分析比较不同处理对小麦苗光合活性和抗氧化活性的影响.[结果]外源GABA处理能提高小麦幼苗的光合活性和抗氧化活性,经0.75 mmol/L GABA处理后,小麦幼苗的光合活性和抗氧化活性显著提高(P<0.05),同时小麦生物膜的损伤得到修复.[结论]GABA是通过增强小麦的光合活性和抗氧化活性来提高小麦对盐胁迫的耐受性.

Effects of gamma-aminobutyric acid on salt tolerance of wheat

[Objective]Effects of gamma-aminobutyric acid(GABA) on photosynthetic activity and antioxidant activity were studied under salt stress,in order to reveal the machanism of GABA in improving salt resistance of wheat.[Method]Growth parameters,such as gas exchange,actual quantum yield of photosynthesis,photosynthetic pigments, activities of antioxidant enzymes,malondialdehyde(MDA) contents and relative electrolyte leakage(REC) in wheat seedlings were determined under different GABA concentrations. And effects of different treatments on photosynthetic activity and antioxidant activity of wheat were compared.[Result]Exogenous GABA can increased photosynthetic activity and antioxidant activity of wheat seedlings. Treated by 0.75 mmol/L GABA,photosynthetic activity and antioxidant activity of wheat significantly increased(P<0.05),and the damaged biological membrane was repaired.[Conclusion]GABA improves the resistance of wheat to salt by increasing photosynthetic activity and antioxidant activity of wheat.