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Novel Salicylic Acid Analogs Induce a Potent Defense Response in Arabidopsis

文献类型： 外文期刊

作者： Palmer, Ian Arthur 1 ; Chen, Huan 1 ; Chen, Jian 1 ; Chang, Ming 1 ; Li, Min 1 ; Liu, Fengquan 2 ; Fu, Zheng Qing 1 ;

作者机构： 1.Univ South Carolina, Dept Biol Sci, Columbia, SC 29208 USA

2.Jiangsu Acad Agr Sci, Inst Plant Protect, Minist Sci & Technol, Jiangsu Key Lab Food Qual & Safety,State Key Lab, Nanjing 210014, Peoples R China

关键词： salicylic acid; analogs; NPR1; NPR3; NPR4; PR1; Pseudomonas syringae

期刊名称：INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES （ 影响因子：5.923； 五年影响因子：6.132 ）

ISSN： 1422-0067

年卷期： 2019 年 20 卷 13 期

页码：

收录情况： SCI

摘要： The master regulator of salicylic acid (SA)-mediated plant defense, NPR1 (NONEXPRESSER OF PR GENES 1) and its paralogs NPR3 and NPR4, act as SA receptors. After the perception of a pathogen, plant cells produce SA in the chloroplast. In the presence of SA, NPR1 protein is reduced from oligomers to monomers, and translocated into the nucleus. There, NPR1 binds to TGA, TCP, and WRKY transcription factors to induce expression of plant defense genes. A list of compounds structurally similar to SA was generated using ChemMine Tools and its Clustering Toolbox. Several of these analogs can induce SA-mediated defense and inhibit growth of Pseudomonas syringae in Arabidopsis. These analogs, when sprayed on Arabidopsis, can induce the accumulation of the master regulator of plant defense NPR1. In a yeast two-hybrid system, these analogs can strengthen the interactions among NPR proteins. We demonstrated that these analogs can induce the expression of the defense marker gene PR1. Furthermore, we hypothesized that these SA analogs could be potent tools against the citrus greening pathogen Candidatus liberibacter spp. In fact, our results suggest that the SA analogs we tested using Arabidopsis may also be effective for inducing a defense response in citrus. Several SA analogs consistently strengthened the interactions between citrus NPR1 and NPR3 proteins in a yeast two-hybrid system. In future assays, we plan to test whether these analogs avoid degradation by SA hydroxylases from plant pathogens. In future assays, we plan to test whether these analogs avoid degradation by SA hydroxylases from plant pathogens.

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