GABA对小麦幼苗耐盐性的影响

以小麦为试验材料,研究了NaCl胁迫下外源GABA浓度对小麦发芽率、芽长、根长、鲜干重、相对电导率及其酶活性的影响.结果表明:与对照相比,GABA浸种促进了小麦幼苗芽的生长,对根的生长影响较小;在GABA浓度为0.5 mmol.L-1条件下,小麦幼苗的发芽率及其鲜干重有明显的提高;相对电导率的测定结果显示,不同浓度GABA对膜都有不同程度的保护作用,在GABA浓度为0.5 mmol.L-1时效果最显著;对SOD、POD和CAT这几种酶活性的测定结果显示,随着GABA浓度的增加其活性都有不同程度的增加;由此推断,外源GABA可以减轻盐胁迫对小麦幼苗造成的伤害,具有一定的生理保护作用.

Effects of gamma-aminobutyric acid (GABA) on NaCl-stress of wheat seedlings

Wheat(cv.Liaoda 091) was used as the material,effects of exogenous GABA at different concentration levels were studied on the germination characters and physiological indexes of wheat seedlings under NaCl-stress,such as germination percentage,bud length,root length,fresh weight,dry weight,relative conductivity and enzyme activity.The result indicated that seeds soaked with GABA promoted the growth of seedling;however,a little effect on growth of root when compared with the control.GABA at 0.5 mmol·L-1 significantly increased germination rate and the fresh dry weight of wheat seedling.The result of relative conductivity showed that GABA at different concentration had a varying degree protective for membrane,the concentration at 0.5 mmol·L-1 had the maximum protection.GABA enhanced the activity of SOD,POD and CAT,the activity of the enzymes increased along with the concentration of GABA.It is suggested that extraneous GABA could decrease NaCl-stress of wheat seedlings by increasing protection of membrane.