Taniguchi Shiduku, Hosokawa-Shinonaga Yumi, Tamaoki Daisuke, Yamada Shoko, Akimitsu Kazuya, Gomi Kenji
Faculty of Agriculture and Gene Research Center, Kagawa University, Miki, Kagawa, 761-0795, Japan.
Plant Cell Environ. 2014 Feb;37(2):451-61. doi: 10.1111/pce.12169. Epub 2013 Aug 19.
Jasmonic acid (JA) is involved in the regulation of host immunity in plants. Recently, we demonstrated that JA signalling has an important role in resistance to rice bacterial blight caused by Xanthomonas oryzae pv. oryzae (Xoo) in rice. Here, we report that many volatile compounds accumulate in response to exogenous application of JA, including the monoterpene linalool. Expression of linalool synthase was up-regulated by JA. Vapour treatment with linalool induced resistance to Xoo, and transgenic rice plants overexpressing linalool synthase were more resistance to Xoo, presumably due to the up-regulation of defence-related genes in the absence of any treatment. JA-induced accumulation of linalool was regulated by OsJAZ8, a rice jasmonate ZIM-domain protein involving the JA signalling pathway at the transcriptional level, suggesting that linalool plays an important role in JA-induced resistance to Xoo in rice.
茉莉酸（JA）参与植物宿主免疫的调控。最近，我们证明了JA信号传导在水稻对由稻黄单胞菌水稻致病变种（Xoo）引起的水稻白叶枯病的抗性中起着重要作用。在此，我们报道，响应于外源施用JA会积累许多挥发性化合物，包括单萜芳樟醇。芳樟醇合酶的表达被JA上调。用芳樟醇进行蒸汽处理可诱导对Xoo的抗性，并且过表达芳樟醇合酶的转基因水稻植株对Xoo更具抗性，这可能是由于在没有任何处理的情况下防御相关基因的上调所致。JA诱导的芳樟醇积累受OsJAZ8调控，OsJAZ8是一种水稻茉莉酸ZIM结构域蛋白，在转录水平上参与JA信号传导途径，这表明芳樟醇在JA诱导的水稻对Xoo的抗性中起重要作用。
