Tanaka Keiichiro, Taniguchi Shiduku, Tamaoki Daisuke, Yoshitomi Kayo, Akimitsu Kazuya, Gomi Kenji
a Faculty of Agriculture and Gene Research Center; Kagawa University; Miki; Kagawa, Japan.
Plant Signal Behav. 2014;9(7):e29247. doi: 10.4161/psb.29247.
The plant hormone jasmonic acid (JA) has a crucial role in defense responses against pathogens in rice. We recently reported that some volatile compounds accumulate in response to JA treatment, and that the monoterpene linalool plays an important role in JA-induced resistance to rice bacterial blight caused by Xanthomonas oryzae pv oryzae (Xoo) in rice. One of the JA-responsive volatiles, (E,E)-2,4-heptadienal, has both antibacterial and antifungal activity against Xoo, and the rice fungal pathogen Magnaporthe oryzae. In addition, (E,E)-2,4-heptadienal was toxic to rice plants. These phenomena were not observed when linalool was treated. These results indicate that accumulation of the (E,E)-2,4-heptadienal in response to JA is a double-edged sword, but it is essential for survival against pathogen attacks in rice.
植物激素茉莉酸(JA)在水稻对病原体的防御反应中起着关键作用。我们最近报道,一些挥发性化合物会因茉莉酸处理而积累,并且单萜芳樟醇在茉莉酸诱导的水稻对白叶枯病菌(Xanthomonas oryzae pv oryzae,Xoo)引起的水稻白叶枯病的抗性中发挥重要作用。茉莉酸响应性挥发物之一,(E,E)-2,4-庚二烯醛,对白叶枯病菌和水稻真菌病原体稻瘟病菌(Magnaporthe oryzae)均具有抗菌和抗真菌活性。此外,(E,E)-2,4-庚二烯醛对水稻植株有毒。用芳樟醇处理时未观察到这些现象。这些结果表明,响应茉莉酸而积累的(E,E)-2,4-庚二烯醛是一把双刃剑,但对于水稻在病原体攻击下的存活至关重要。