PeaT1-induced systemic acquired resistance in tobacco follows salicylic acid-dependent pathway

文献类型： 外文期刊

第一作者： Yang, Xiufen

作者： Yang, Xiufen;Qiu, Dewen;Guo, Lihua;Zeng, Hongmei;Mao, Jianjun;Gao, Qiufeng

作者机构：

关键词： peroxidase: 9003-99-0;EC 1.11.1.7;salicylic acid: 69-72-7;synthesis;PeaT1: microbial protein elicitor;molecular mechanism;signal transduction pathway;systemic acquired resistance;enzyme activity;disease resistance;salicylic acid-dependent pathway

期刊名称：MOLECULAR BIOLOGY REPORTS （ 影响因子：2.316； 五年影响因子：2.357 ）

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收录情况： SCI

摘要： Systemic acquired resistance (SAR) is an inducible defense mechanism which plays a central role in protecting plants from pathogen attack. A new elicitor, PeaT1 from Alternaria tenuissima, was expressed in Escherichia coil and characterized with systemic acquired resistance to tobacco mosaic virus (TMV). PeaT1-treated plants exhibited enhanced systemic resistance with a significant reduction in number and size of TMV lesions on wild tobacco leaves as compared with control. The quantitative analysis of TMV CP gene expression with real-time quantitative PCR showed there was reduction in TMV virus concentration after PeaT1 treatment. Similarly, peroxidase (POD) activity and lignin increased significantly after PeaT1 treatment. The real-time quantitative PCR revealed that PeaT1 also induced the systemic accumulation of pathogenesis-related gene, PR-1a and PR-1b which are the markers of systemic acquired resistance (SAR), NPR1 gene for salicylic acid (SA) signal transduction pathway and PAL gene for SA synthesis. The accumulation of SA and the failure in development of similar level of resistance as in wild type tobacco plants in PeaT1 treated nahG transgenic tobacco plants indicated that PeaT1-induced resistance depended on SA accumulation. The present work suggested that the molecular mechanism of PeaT1 inducing disease resistance in tobacco was likely through the systemic acquired resistance pathway mediated by salicylic acid and the NPR1 gene.

分类号： Q7

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