The reduction of reactive oxygen species formation by mitochondrial alternative respiration in tomato basal defense against TMV infection

文献类型： 外文期刊

第一作者： Liao, Yang-Wen-Ke

作者： Liao, Yang-Wen-Ke;Shi, Kai;Fu, Li-Jun;Zhang, Shuai;Li, Xin;Jiang, Yu-Ping;Zhou, Yan-Hong;Xia, Xiao-Jian;Liang, Wu-Sheng;Yu, Jing-Quan;Dong, De-Kun;Yu, Jing-Quan

作者机构：

关键词： Alternative oxidase;Cyanide-resistant respiration;Reactive oxygen species;Tomato (Solanum lycopersium);Tobacco mosaic virus

期刊名称：PLANTA （ 影响因子：4.116； 五年影响因子：4.316 ）

ISSN： 0032-0935

年卷期： 2012 年 235 卷 2 期

页码：

收录情况： SCI

摘要： The role of mitochondrial alternative oxidase (AOX) and the relationship between systemic AOX induction, ROS formation, and systemic plant basal defense to Tobacco mosaic virus (TMV) were investigated in tomato plants. The results showed that TMV inoculation significantly increased the level of AOX gene transcripts, ubiquinone reduction levels, pyruvate content, and cyanide-resistant respiration (CN-resistant R) in upper, un-inoculated leaves. Pretreatment with potassium cyanide (KCN, a cytochrome pathway inhibitor) greatly increased CN-resistant R and reduced reactive oxygen species (ROS) formation, while application of salicylhydroxamic acid (SHAM, an AOX inhibitor) blocked the AOX activity and enhanced the production of ROS in the plants. Furthermore, TMV systemic infection was enhanced by SHAM and reduced by KCN pretreatment, as compared with the un-pretreated TMV counterpart. In addition, KCN application significantly diminished TMV-induced increase in antioxidant enzyme activities and dehydroascorbate/total ascorbate pool, while an opposite change was observed with SHAM-pretreated plants. These results suggest that the systemic induction of the mitochondrial AOX pathway plays a critical role in the reduction of ROS to enhance basal defenses. Additional antioxidant systems were also coordinately regulated in the maintenance of the cellular redox homeostasis.

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