Jasmonate-mediated polyamine oxidase 6 drives herbivore-induced polyamine catabolism in rice

文献类型： 外文期刊

第一作者： Zu, Hongyue

作者： Zu, Hongyue;Bai, Weiwei;Kuai, Peng;Lu, Jing;Lou, Yonggen;Li, Ran;Zhang, Jing;Bai, Weiwei;Cheng, Jingli

作者机构：

关键词： rice (Oryza sativa); brown planthopper (Nilaparvata lugens); polyamine catabolism; polyamine oxidase 6; jasmonate; spermidine

期刊名称：PLANT JOURNAL （ 影响因子：5.7； 五年影响因子：7.0 ）

ISSN： 0960-7412

年卷期： 2024 年 120 卷 5 期

页码：

收录情况： SCI

摘要： Polyamines (PAs) along with their conjugated forms, are important mediators of plant defense mechanisms against both biotic and abiotic stresses. Flavin-containing polyamine oxidases (PAOs) regulate PA levels through terminal oxidation. To date, the role of PAOs in plant-herbivore interaction remains poorly understood. We discovered that infestation by the brown planthopper (BPH) disrupts PA homeostasis within the leaf sheaths of rice plants, which co-occurs with the upregulation of OsPAO6, a tissue-specific inducible, apoplast-localized enzyme that regulates the terminal catabolism of spermidine (Spd) and spermine. Functional analysis using CRISPR-Cas9 genome-edited plants revealed that pao6 mutants accumulated significantly higher levels of Spd and phenylpropanoid-conjugated Spd in response to BPH infestation compared to wild-type controls. In addition, BPH feeding on pao6 mutants led to increased honeydew excretion and plant damage by female adults, consistent with in vitro experiments in which Spd enhanced BPH feeding. Furthermore, OsPAO6 transcription is regulated by jasmonate (JA) signaling, and it is dependent on MYC2, which directly binds to the G-box-like motif in the OsPAO6 promoter. Our findings reveal an important role of OsPAO6 in regulating polyamine catabolism in JA-induced responses triggered by herbivore attacks in rice.

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