| Title: | Indole primes defence signalling and increases herbivore resistance in tea plants |
| Author(s): | Ye M; Liu M; Erb M; Glauser G; Zhang J; Li X; Sun X; |
| Address: | "Key Laboratory of Tea Biology and Resources Utilization, Ministry of Agriculture and Rural Affairs, National Center for Tea Plant Improvement, Tea Research Institute, Chinese Academy of Agricultural Sciences, Hangzhou, China. Institute of Plant Sciences, University of Bern, Bern, Switzerland. Neuchatel Platform of Analytical Chemistry, University of Neuchatel, Neuchatel, Switzerland" |
| ISSN/ISBN: | 1365-3040 (Electronic) 0140-7791 (Linking) |
| Abstract: | "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 (Ca(2+) ) 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 Ca(2+) 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 Ca(2+) 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" |
| Keywords: | Animals Camellia sinensis/drug effects/*metabolism/physiology Catechin/metabolism Hydroxybenzoates/metabolism Indoles/*pharmacology Larva Moths *Plant Defense Against Herbivory/drug effects Plant Growth Regulators/metabolism Secondary Metabolism/drug effe; |
| Notes: | "MedlineYe, Meng Liu, Miaomiao Erb, Matthias Glauser, Gaetan Zhang, Jin Li, Xiwang Sun, Xiaoling eng Research Support, Non-U.S. Gov't 2020/10/01 Plant Cell Environ. 2021 Apr; 44(4):1165-1177. doi: 10.1111/pce.13897. Epub 2020 Nov 2" |
