The jasmonic acid (JA) pathway plays crucial roles in plant defence against pathogens and herbivores. Rice stripe virus (RSV) is the type member of the genus Tenuivirus. It is transmitted by the small brown planthopper (SBPH) and causes damaging epidemics in East Asia. The role(s) that JA may play in the tripartite interaction against RSV, its host, and vector are poorly understood. Here, we found that the JA pathway was induced by RSV infection and played a defence role against RSV. The coat protein (CP) was the major viral component responsible for inducing the JA pathway. Methyl jasmonate treatment attracted SBPHs to feed on rice plants while a JA‐deficient mutant was less attractive than wild‐type rice. SBPHs showed an obvious preference for feeding on transgenic rice lines expressing RSV CP. Our results demonstrate that CP is an inducer of the JA pathway that activates plant defence against RSV while also attracting SBPHs to feed and benefitting viral transmission. This is the first report of the function of JA in the tripartite interaction between RSV, its host, and its vector.

中文翻译：

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水稻条纹病毒外壳蛋白诱导茉莉酸的积累，激活植物防御病毒的能力，同时也吸引其载体觅食。

茉莉酸（JA）途径在植物防御病原体和食草动物中起着至关重要的作用。水稻条纹病毒（RSV）是Tenuivirus属的类型成员。它是由小褐飞虱（SBPH）传播的，并在东亚造成破坏性流行病。JA可能在针对RSV，其宿主和载体的三方相互作用中扮演的角色知之甚少。在这里，我们发现JA途径是由RSV感染诱导的，并且对RSV具有防御作用。外壳蛋白（CP）是负责诱导JA途径的主要病毒成分。茉莉酸甲酯处理吸引了SBPHs以水稻为食，而缺少JA的突变体的吸引力不如野生型水稻。SBPHs表现出明显的偏好以表达RSV CP的转基因水稻为食。我们的结果表明，CP是JA途径的诱导物，可激活植物抵抗RSV的防御能力，同时也吸引SBPHs进食并有利于病毒传播。