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Indole primes defence signalling and increases herbivore resistance in tea plants
Plant, Cell & Environment ( IF 7.3 ) Pub Date : 2020-09-29 , DOI: 10.1111/pce.13897
Meng Ye 1 , Miaomiao Liu 1 , Matthias Erb 2 , Gaétan Glauser 3 , Jin Zhang 1 , Xiwang Li 1 , Xiaoling Sun 1
Affiliation  

Upon herbivore attack, plants emit herbivore‐induced plant volatiles (HIPVs). HIPVs can prime defences and resistance of intact plants. However, how HIPVs are decoded and translated into functional defence responses is not well understood, especially in long‐lived woody plants. Here, we investigated the impact of the aromatic HIPV indole on defence‐related early signalling, phytohormone accumulation, secondary metabolite biosynthesis and herbivore resistance in tea plants. We find that tea plants infested with tea geometrid caterpillars release indole at concentrations >450 ng*hr−1. Exposure to corresponding doses of synthetic indole primes the expression of early defence genes involved in calcium (Ca2+) signalling, MPK signalling and jasmonate biosynthesis. Indole exposure also primes the production of jasmonates and defence‐related secondary metabolites. These changes are associated with higher herbivore resistance of indole‐exposed tea plants. Chemical inhibition of Ca2+ and jasmonate signalling provides evidence that both are required for indole‐mediated defence priming and herbivore resistance. Our systematic assessment of the impact of indole on defence signalling and deployment shows that indole acts by boosting Ca2+ signalling, resulting in enhanced jasmonate‐dependent defence and resistance in a woody plant. Our work extends the molecular basis of HIPV‐induced defence priming from annual plants to an economically important tree species.

中文翻译:

吲哚引发防御信号并增加茶树的食草动物抵抗力

在食草动物攻击时,植物会释放食草动物诱导的植物挥发物 (HIPV)。HIPV 可以启动完整植物的防御和抵抗力。然而,HIPVs 如何被解码并转化为功能性防御反应还不是很清楚,尤其是在长寿的木本植物中。在这里,我们研究了芳香 HIPV 吲哚对茶树防御相关早期信号、植物激素积累、次生代谢物生物合成和食草动物抗性的影响。我们发现感染了茶尺蠖毛虫的茶树以>450 ng*hr -1 的浓度释放吲哚。暴露于相应剂量的合成吲哚会引发与钙相关的早期防御基因的表达(Ca 2+) 信号、MPK 信号和茉莉酸生物合成。吲哚暴露还引发了茉莉酸和防御相关次生代谢物的产生。这些变化与暴露于吲哚的茶树具有更高的食草动物抗性有关。Ca 2+和茉莉酸信号传导的化学抑制提供了证据表明两者都是吲哚介导的防御启动和食草动物抗性所必需的。我们对吲哚对防御信号传导和部署影响的系统评估表明,吲哚通过增强 Ca 2+信号传导起作用,从而增强木本植物中茉莉酸依赖性防御和抵抗力。我们的工作将 HIPV 诱导的防御启动的分子基础从一年生植物扩展到经济上重要的树种。
更新日期:2020-09-29
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