RNAi knockdown of rice SE5 gene is sensitive to the herbicide methyl viologen by the down-regulation of antioxidant defense

文献类型： 外文期刊

第一作者： Xu, Sheng

作者： Xu, Sheng;Wang, Lijuan;Zhang, Bo;Han, Bin;Xie, Yanjie;Wang, Ning;Cui, Weiti;Shen, Wenbiao;Xu, Sheng;Wang, Lijuan;Zhang, Bo;Han, Bin;Xie, Yanjie;Wang, Ning;Cui, Weiti;Shen, Wenbiao;Xu, Sheng;Wang, Ren;Yang, Jie;Zhong, Weigong;Chen, Huiping

作者机构：

关键词： Carbon monoxide;Methyl viologen hypersensitivity;Oryza sativa;Oxidative stress;SE5

期刊名称：PLANT MOLECULAR BIOLOGY （ 影响因子：4.076； 五年影响因子：4.89 ）

ISSN：

年卷期：

页码：

收录情况： SCI

摘要： Plant heme oxygenase (HO) catalyzes the oxygenation of heme to biliverdin, carbon monoxide (CO), and free iron (Fe ~(2+))-and Arabidopsis and rice (Oryza sativa) HOs are involved in light signaling. Here, we identified that the rice PHOTOPERIOD SENSITIVITY 5 (SE5) gene, which encoded a putative HO with high similarity to HO-1 from Arabidopsis (HY1), exhibited HO activity, and localized in the chloroplasts. Rice RNAi mutants silenced for SE5 were generated and displayed early flowering under long-day conditions, consistent with phenotypes of the null mutation in SE5 gene reported previously (se5 and s73). The herbicide methyl viologen (MV), which produces reactive oxygen species (ROS), was applied to determine whether SE5 regulates oxidative stress response. Compared with wild-type, SE5 RNAi transgenic plants aggravated seedling growth inhibition, chlorophyll loss and ROS overproduction, and decreased the transcripts of some representative antioxidative genes. By contrast, administration of exogenous CO partially rescued corresponding MV hypersensitivity in the SE5 RNAi plants. Alleviation of seed germination inhibition, chlorophyll loss and ROS overproduction, as well as the induction of antioxidant defense were further observed when SE5 or HY1 was overexpressed in transgenic Arabidopsis plants, indicating that SE5 may be useful for molecular breeding designed to improve plant tolerance to oxidative stress.

分类号： Q946

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