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Exogenous gamma-aminobutyric acid alleviates oxidative damage caused by aluminium and proton stresses on barley seedlings

文献类型： 外文期刊

作者： Song, Hongmiao 1 ; Xu, Xiangbin 2 ; Wang, Hua 1 ; Wang, Huizhong 2 ; Tao, Yuezhi 1 ;

作者机构： 1.Zhejiang Acad Agr Sci, Inst Crop & Nucl Technol Utilizat, Hangzhou 310021, Zhejiang, Peoples R China

2.Hangzhou Normal Univ, Key Lab Biochem & Mol Biol, Hangzhou 310036, Zhejiang, Peoples R China

关键词： oxidative damage;root growth;aluminium stress;antioxidant defence response;proton stress

期刊名称：JOURNAL OF THE SCIENCE OF FOOD AND AGRICULTURE （ 影响因子：3.638； 五年影响因子：3.802 ）

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收录情况： SCI

摘要： BACKGROUND: Proton (H+) and aluminium (Al3+) toxicities are major factors limiting crop production on acid soils, while gamma-aminobutyric acid (GABA) is a non-protein amino acid involved in various stress tolerances in plants. In this study, to determine whether exogenous GABA is functional in alleviating oxidative stress induced by H+ and Al3+ toxicities, the antioxidant defence response regulated by GABA was investigated in barley (Hordeum vulgare L.).RESULTS: After 24 h treatments of seedlings under H+, Al3+ and combined stresses with and without GABA, morphological and biochemical assays were conducted. It was observed that the inhibition of seedling root elongation caused by Al3+ and H+ toxicities was significantly mitigated by GABA. The amount of carbonylated proteins with molecular masses of 14.4-97 kDa was decreased. The activities of antioxidant enzymes were enhanced, the content of malondialdehyde was reduced and the accumulation of reactive oxygen species (ROS), as shown by staining roots with nitroblue tetrazolium, declined in GABA-treated seedlings.CONCLUSION: GABA can alleviate oxidative damage caused by H+ and Al3+ toxicities in barley seedlings by activating antioxidant defence responses and reducing the elevated levels of carbonylated proteins caused by ROS. (C) 2010 Society of Chemical Industry

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