Cytokinin Confers Brown Planthopper Resistance by Elevating Jasmonic Acid Pathway in Rice

文献类型： 外文期刊

第一作者： Zhang, Xiao

作者： Zhang, Xiao;Liu, Daoming;Gao, Dong;Zhao, Weining;Du, Huaying;Qiu, Zeyu;Huang, Jie;Wen, Peizheng;Wang, Yongsheng;Li, Qi;Wang, Wenhui;Xu, Haosen;He, Jun;Liu, Yuqiang;Wan, Jianmin;Wan, Jianmin

作者机构：

关键词： cytokinins (CKs); jasmonic acid (JA); rice (Oryza sativa); brown planthopper (BPH)

期刊名称：INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES （ 影响因子：6.208； 五年影响因子：6.628 ）

ISSN：

年卷期： 2022 年 23 卷 11 期

页码：

收录情况： SCI

摘要： Plants have evolved a sophisticated defense system that employs various hormone pathways to defend against attacks by insect pests. Cytokinin (CK) plays an important role in plant growth and stress tolerance, but the role of CKs in plant-insect interaction remains largely unclear. Here, we report that CKs act as a positive regulator in rice resistance against brown planthopper (BPH), a devastating insect pest of rice. We found that BPH feeding promotes CK biosynthesis and signaling in rice. Exogenous application of CKs significantly increased the rice resistance to BPH. Increasing endogenous CKs by knocking out cytokinin oxidase/dehydrogenase (OsCKXs) led to enhanced resistance to BPH. Moreover, the levels of the plant hormone jasmonic acid (JA) and the expression of JA-responsive genes were elevated by CK treatment and in OsCKXs knockout plants. Furthermore, JA-deficient mutant og1 was more susceptible to BPH, and CK-induced BPH resistance was suppressed in og1. These results indicate that CK-mediated BPH resistance is JA-dependent. Our findings provide the direct evidence for the novel role of CK in promoting insect resistance, and demonstrate that CK-induced insect resistance is JA-dependent. These results provide important guidance for effective pest management strategies in the future.

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