Brassinosteroids mediate susceptibility to brown planthopper by integrating with the salicylic acid and jasmonic acid pathways in rice.
Brassinosteroids mediate susceptibility to brown planthopper by integrating with the salicylic acid and jasmonic acid pathways in rice.
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油菜素类固醇通过与水稻中的水杨酸和茉莉酸途径结合介导对褐飞虱的易感性
DOI：
10.1093/jxb/ery223
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发表时间：
2018-08-14
影响因子：
6.9
通讯作者：
Wan J
中科院分区：
文献类型：
--
作者：
Pan G;Liu Y;Ji L;Zhang X;He J;Huang J;Qiu Z;Liu D;Sun Z;Xu T;Liu L;Wang C;Jiang L;Cheng X;Wan J
油菜素内酯通过对水杨酸和茉莉酸途径的影响，在水稻抵御褐飞虱侵染中起负作用。提高对植物和昆虫之间相互作用的认识将有助于更好地控制作物中的昆虫。油菜素内酯（BRs）在植物生长、发育过程和对病原体感染的反应中起着至关重要的作用，但BRs在植物与昆虫相互作用中的作用仍不清楚。在本研究中，我们描述了BRs在水稻抵御褐飞虱（Nilaparvata lugens）中的负作用，并探讨了其潜在机制。我们发现BPH侵害人抑制了BR途径，同时相继激活了水杨酸（SA）和茉莉酸（JA）途径。此外，br过量突变体和24-表油菜素内酯（BL）处理的植株对BPH的敏感性增加，而br缺乏突变体比野生型更具抗性。BPH侵染后，BRs下调SA通路相关基因表达，降低SA含量，而上调JA通路相关基因表达，增加JA含量。此外，在ja缺陷型和ja不敏感型突变体中，br介导的SA通路抑制都受到了损害。我们的研究结果表明，BRs通过调节SA和JA途径促进水稻对BPH的敏感性。
Brassinosteroids play a negative role in rice defense against infestation by the brown planthopper through contrasting effects on the salicylic acid and jasmonic acid pathways. Improved knowledge of the interactions between plants and insects will facilitate better insect control in crops. Brassinosteroids (BRs) play a vital role in plant growth, developmental processes, and responses to pathogen infection, but the role of BRs in interactions between plants and insects remain largely unknown. In this study, we characterized a negative role of BRs in rice defense against brown planthopper (BPH, Nilaparvata lugens) and examined its underlying mechanisms. We found that BPH infestation suppressed the BR pathway while successively activating the salicylic acid (SA) and jasmonic acid (JA) pathways. In addition, BR-overproducing mutants and plants treated with 24-epibrassinolide (BL) showed increased susceptibility to BPH, whereas BR-deficient mutants were more resistant than the wild-type. BRs down-regulated the expression of genes related to the SA pathway and reduced SA content while genes related to the JA pathway were up-regulated and JA content increased after BPH infestation. Furthermore, BR-mediated suppression of the SA pathway was impaired both in JA-deficient and JA-insensitive mutants. Our results demonstrate that BRs promote the susceptibility of rice plants to BPH by modulating the SA and JA pathways.
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