外源γ-氨基丁酸(GABA)对小麦苗期耐涝性的影响

以冬小麦京都40和春小麦辽春17为材料,用0(对照CK),50,500 mg/L3个浓度的γ-氨基丁酸(GABA)浸种处理,小麦幼苗高约10 cm后进行涝害胁迫,持续3 d,研究外源GABA对小麦幼苗耐涝性的影响。结果表明,适当浓度的GABA处理可以明显提高小麦幼苗的耐涝性。在涝害条件下,50 mg/L GABA处理能使辽春17株高增加17.5%,京都40增加28.8%,根系总长度分别增加46.58%和11.9%。同时叶绿素含量及Fv/Fm,DPPH活性氧清除能力均能维持较高水平,膜脂过氧化水平减轻,MDA积累量降低。GABA可能通过调节光合叶绿素系统和抗氧化酶系统来减少涝害胁迫引起的生长抑制现象,从而增强小麦耐涝性。

Effects of Exogenous GABA on Waterlogged Tolerance in Wheat Seedlings

Spring wheat(Triticum aestivum L.) Liaochun17 and winter wheat(Triticum aestivum L.) Jingdu 40 was chose to research effect of exogenous gamma aminobutyric acid(GABA) on waterlogged tolerance for wheat seedlings.Wheat seeds were drenched with 0,50 and 500 mg/L GABA solution,and seedlings of 10 cm in height were treated with flood for 3 days.Results showed that the treatment of GABA at favorable concentration enhanced the waterlogged tolerance of wheat seedlings.After the flood,the seedlings height of Liaochun17 and Jingdu40 at 50 mg/L GABA were increased by 17.5% and 28.8% respectively,compared with non-GABA treatment.And the total roots length were increased by 46.58% and 11.9% in Liaochun17 and Jingdu40 respectively.The content of chlorophyll and Fv/Fm,DPPH-radical scavenging activity were also increased,but the MDA content in leaves was reduced.The above results indicated that exogenous GABA regulated the content of chlorophyll and antioxidant enzyme,enhanced the growth and tolerance of waterlogged.