title: Regurgitant derived from the tea geometrid Ectropis obliqua suppresses wound-induced polyphenol oxidases activity in tea plants.
abstract: Polyphenol oxidases (PPOs) have been reported to play an important role in protecting plants from attack by herbivores. However, little is known about their role in tea. Here, we investigated the effect of PPOs on interactions between tea plants and the tea geometrid Ectropis obliqua, one of the most important insect pests of tea. Jasmonic acid (JA) treatment resulted in increases in PPO activity, and the effect of JA was dose dependent. Ectropis obliqua caterpillars grew and developed more slowly on JA-treated tea plants than on control plants, and larval weight gains depended on the JA dosage. Artificial diet complemented with PPOs reduced the growth and survival rate of E. obliqua caterpillars, and there was a negative relationship between PPO level and larval growth and survival. Unlike mechanical wounding, which is an effective inducer of tea plant PPO activity, wounding plus the herbivore regurgitant or herbivore infestation suppressed the wound-induced PPO activities, especially at 4 days after treatment. These results suggest that PPOs are an important anti-herbivore factor in tea plants, defending them against E. obliqua larvae, and that E. obliqua larvae have evolved to elude the tea plant's defense by inhibiting the production of PPOs.
authors.affiliation: Tea Research Institute, Chinese Academy of Agricultural Sciences, Hangzhou, 310008, China.
authors.forename: Zi-Wei
authors.initials: ZW
authors.lastname: Yang
authors.forename: Xiao-Na
authors.initials: XN
authors.lastname: Duan
authors.forename: Shan
authors.initials: S
authors.lastname: Jin
authors.forename: Xi-Wang
authors.initials: XW
authors.lastname: Li
authors.forename: Zong-Mao
authors.initials: ZM
authors.lastname: Chen
authors.forename: Bing-Zhong
authors.initials: BZ
authors.lastname: Ren
authors.forename: Xiao-Ling
authors.initials: XL
authors.lastname: Sun
mesh_terms: D000818:Animals; D028241:Camellia sinensis / Q000201:enzymology / Q000378:metabolism*; D004156:Catechol Oxidase / Q000378:metabolism*; D003517:Cyclopentanes / Q000378:metabolism*; D060434:Herbivory; D007814:Larva / Q000254:growth & development / Q000502:physiology; D009036:Moths / Q000254:growth & development / Q000502:physiology*; D054883:Oxylipins / Q000378:metabolism*; D010937:Plant Growth Regulators / Q000494:pharmacology*; D013053:Spectrophotometry
chemical_list: D003517:Cyclopentanes; D054883:Oxylipins; D010937:Plant Growth Regulators; C011006:jasmonic acid; D004156:Catechol Oxidase