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首页> 外文期刊>Protoplasma: An International Journal of Cell Biology >Direct suppression of a rice bacterial blight (Xanthomonas oryzae pv. oryzae) by monoterpene (S)-limonene
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Direct suppression of a rice bacterial blight (Xanthomonas oryzae pv. oryzae) by monoterpene (S)-limonene

机译：单萜（S）-柠檬烯直接抑制水稻白叶枯病（Xanthomonas oryzae pv。oryzae）

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摘要

Rice bacterial blight, caused by Xanthomonas oryzae pv. oryzae (Xoo), is a severe disease of rice plants. Upon pathogen infection, rice biosynthesizes phytoalexins, including diterpenoids such as momilactones, phytocassanes, and oryzalexins. However, information on headspace volatiles in response to Xoo infection is limited. We have examined headspace volatile terpenes, induced by the infection of Xoo, and investigated their biological roles in the rice plant. Monoterpenes alpha-thujene, alpha-pinene, sabinene, myrcene, alpha-terpene, and (S)-limonene and sesquiterpenes cyclosativene, alpha-copaene, and beta-elemene were detected from 1-week-old Xoo-infected rice seedlings, by solid-phase microextraction-gas chromatography-mass spectrometry. All monoterpenes were constitutively released from rice seedlings before Xoo infection. However, (S)-limonene emission was further elicited after exposure of the seedlings to Xoo in coincidence with upregulation of limonene synthase gene (OsTPS20) transcripts. Only the stereospecific (S)-limonene [and not (R)-limonene or other monoterpenes] severely inhibited Xoo growth, as confirmed by disc diffusion and liquid culture assays. Rice seedlings showed suppressed pathogenic symptoms suggestive of resistance to Xoo infection after foliar treatment with (S)-limonene. Collectively, our findings suggest that (S)-limonene is a volatile phytoanticipin, which plays a significant role in suppressing Xoo growth in rice seedlings.
机译：水稻细菌性疫病，由米黄单胞菌引起。稻米（Xoo）是水稻的严重病害。病原体感染后，大米会生物合成植物抗毒素，包括二萜类化合物，如摩尼内酯，植物酪蛋白和稻根黄素。但是，有关响应Xoo感染的顶空挥发物的信息有限。我们检查了由Xoo感染引起的顶空挥发性萜烯，并研究了它们在水稻植株中的生物学作用。从1周大的Xoo感染的水稻幼苗中检出了单萜α-thujene，α-pine烯，，烯，月桂烯，α-萜烯和（S）柠檬烯，倍半萜环香酮，α-异茄烯和β-榄香烯固相微萃取-气相色谱-质谱联用在Xoo感染之前，所有单萜从水稻幼苗中组成性释放。然而，在幼苗暴露于Xoo后，与柠檬烯合酶基因（OsTPS20）转录物的上调同时，进一步引起（S）柠檬烯发射。如盘扩散和液体培养测定所证实的，仅立体特异性（S）-柠檬烯[而不是（R）-柠檬烯或其他单萜）严重抑制Xoo生长。水稻幼苗显示出抑制的病原症状，表明用（S）-柠檬烯进行叶面处理后对Xoo感染具有抗性。总体而言，我们的发现表明，（S）-柠檬烯是一种挥发性植物抗毒素，在抑制水稻幼苗Xoo生长方面起着重要作用。

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