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An effector from cotton bollworm oral secretion impairs host plant defense signaling.

ABSTRACT: Insects have evolved effectors to conquer plant defense. Most known insect effectors are isolated from sucking insects, and examples from chewing insects are limited. Moreover, the targets of insect effectors in host plants remain unknown. Here, we address a chewing insect effector and its working mechanism. Cotton bollworm (Helicoverpa armigera) is a lepidopteran insect widely existing in nature and severely affecting crop productivity. We isolated an effector named HARP1 from H. armigera oral secretion (OS). HARP1 was released from larvae to plant leaves during feeding and entered into the plant cells through wounding sites. Expression of HARP1 in Arabidopsis mitigated the global expression of wounding and jasmonate (JA) responsive genes and rendered the plants more susceptible to insect feeding. HARP1 directly interacted with JASMONATE-ZIM-domain (JAZ) repressors to prevent the COI1-mediated JAZ degradation, thus blocking JA signaling transduction. HARP1-like proteins have conserved function as effectors in noctuidae, and these types of effectors might contribute to insect adaptation to host plants during coevolution.

SUBMITTER: Chen CY

PROVIDER: S-EPMC6628814 | biostudies-literature | 2019 Jul

REPOSITORIES: biostudies-literature

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An effector from cotton bollworm oral secretion impairs host plant defense signaling.

Chen Chun-Yu CY Liu Yao-Qian YQ Song Wei-Meng WM Chen Dian-Yang DY Chen Fang-Yan FY Chen Xue-Ying XY Chen Zhi-Wen ZW Ge Sheng-Xiang SX Wang Chen-Zhu CZ Zhan Shuai S Chen Xiao-Ya XY Mao Ying-Bo YB

Proceedings of the National Academy of Sciences of the United States of America 20190620 28

Insects have evolved effectors to conquer plant defense. Most known insect effectors are isolated from sucking insects, and examples from chewing insects are limited. Moreover, the targets of insect effectors in host plants remain unknown. Here, we address a chewing insect effector and its working mechanism. Cotton bollworm (<i>Helicoverpa armigera</i>) is a lepidopteran insect widely existing in nature and severely affecting crop productivity. We isolated an effector named HARP1 from <i>H. armi ...[more]

PMID: 31221756

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An effector from cotton bollworm oral secretion impairs host plant defense signaling.

Publications

An effector from cotton bollworm oral secretion impairs host plant defense signaling.

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