Hydrogen peroxide-induced proline and metabolic pathway of its accumulation in maize seedlings

文献类型： 外文期刊

第一作者： Yang, Shuang-Long

作者： Yang, Shuang-Long;Lan, Shan-Shan;Gong, Ming;Yang, Shuang-Long;Lan, Shan-Shan;Gong, Ming

作者机构：

关键词： Hydrogen peroxide;Prolinebiosynthesis and degradation;Zea mays;D1-pyrroline- 5-carboxylate synthetase

期刊名称：JOURNAL OF PLANT PHYSIOLOGY （ 影响因子：3.549； 五年影响因子：4.164 ）

ISSN：

年卷期：

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收录情况： SCI

摘要： Exogenous H2O2 treatment led to a significant accumulation of proline in coleoptiles and radicles of maize seedlings. It also induced an almost immediate and rapid increase of activity of the key enzymes delta 1-pyrroline-5-carboxylate synthetase and glutamate dehydrogenase of the glutamate pathway of proline biosynthesis and an up-regulation of delta 1-pyrroline-5-carboxylate synthetase gene expression. Activities of the key enzymes arginase and ornithine aminotransferase of the ornithine pathway of proline biosynthesis increased only after 12 h of H2O2 treatment. Furthermore, the H2O2 treatment caused an early decrease of the activity of proline dehydrogenase, a key enzyme of proline degradation. These results indicate that H2O2 might be involved in signal transduction events, leading to proline accumulation in maize seedlings, and that the H2O2-induced proline accumulation is a combined result of the sequential activation of the glutamate and ornithine pathways of proline biosynthesis and the simultaneous inhibition of proline degradation by H2O2.

分类号： Q94

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