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A rhabdovirus accessory protein inhibits jasmonic acid signaling in plants to attract insect vectors.
Plant Physiology ( IF 7.4 ) Pub Date : 2022-09-28 , DOI: 10.1093/plphys/kiac319
Dong-Min Gao 1 , Zhen-Jia Zhang 1 , Ji-Hui Qiao 1 , Qiang Gao 1, 2 , Ying Zang 1 , Wen-Ya Xu 1 , Liang Xie 1 , Xiao-Dong Fang 1 , Zhi-Hang Ding 1 , Yi-Zhou Yang 1 , Ying Wang 2 , Xian-Bing Wang 1
Affiliation  

Plant rhabdoviruses heavily rely on insect vectors for transmission between sessile plants. However, little is known about the underlying mechanisms of insect attraction and transmission of plant rhabdoviruses. In this study, we used an arthropod-borne cytorhabdovirus, Barley yellow striate mosaic virus (BYSMV), to demonstrate the molecular mechanisms of a rhabdovirus accessory protein in improving plant attractiveness to insect vectors. Here, we found that BYSMV-infected barley (Hordeum vulgare L.) plants attracted more insect vectors than mock-treated plants. Interestingly, overexpression of BYSMV P6, an accessory protein, in transgenic wheat (Triticum aestivum L.) plants substantially increased host attractiveness to insect vectors through inhibiting the jasmonic acid (JA) signaling pathway. The BYSMV P6 protein interacted with the constitutive photomorphogenesis 9 signalosome subunit 5 (CSN5) of barley plants in vivo and in vitro, and negatively affected CSN5-mediated deRUBylation of cullin1 (CUL1). Consequently, the defective CUL1-based Skp1/Cullin1/F-box ubiquitin E3 ligases could not mediate degradation of jasmonate ZIM-domain proteins, resulting in compromised JA signaling and increased insect attraction. Overexpression of BYSMV P6 also inhibited JA signaling in transgenic Arabidopsis (Arabidopsis thaliana) plants to attract insects. Our results provide insight into how a plant cytorhabdovirus subverts plant JA signaling to attract insect vectors.

中文翻译:

弹状病毒辅助蛋白抑制植物中的茉莉酸信号传导以吸引昆虫媒介。

植物弹状病毒严重依赖昆虫载体在无柄植物之间传播。然而,人们对植物弹状病毒吸引昆虫和传播的潜在机制知之甚少。在这项研究中,我们使用节肢动物传播的细胞弹状病毒——大麦黄纹花叶病毒(BYSMV)来证明弹状病毒辅助蛋白提高植物对昆虫载体吸引力的分子机制。在这里,我们发现感染 BYSMV 的大麦 (Hordeum vulgare L.) 植物比模拟处理的植物吸引更多的昆虫媒介。有趣的是,BYSMV P6(一种辅助蛋白)在转基因小麦(Triticum aestivum L.)植物中的过度表达通过抑制茉莉酸(JA)信号通路显着增加了宿主对昆虫载体的吸引力。BYSMV P6 蛋白在体内和体外与大麦植物的组成型光形态发生 9 信号体亚基 5 (CSN5) 相互作用,并对 CSN5 介导的 cullin1 (CUL1) 去RUBy化产生负面影响。因此,基于 CUL1 的 Skp1/Cullin1/F-box 泛素 E3 连接酶有缺陷,无法介导茉莉酸 ZIM 结构域蛋白的降解,导致 JA 信号传导受损并增加昆虫吸引力。BYSMV P6 的过度表达还抑制转基因拟南芥 (Arabidopsis thaliana) 植物中的 JA 信号传导以吸引昆虫。我们的结果深入了解植物细胞杆状病毒如何破坏植物 JA 信号传导以吸引昆虫媒介。基于 CUL1 的 Skp1/Cullin1/F-box 泛素 E3 连接酶有缺陷,无法介导茉莉酸 ZIM 结构域蛋白的降解,导致 JA 信号传导受损并增加昆虫吸引力。BYSMV P6 的过度表达还抑制转基因拟南芥 (Arabidopsis thaliana) 植物中的 JA 信号传导以吸引昆虫。我们的结果深入了解植物细胞杆状病毒如何破坏植物 JA 信号传导以吸引昆虫媒介。基于 CUL1 的 Skp1/Cullin1/F-box 泛素 E3 连接酶有缺陷,无法介导茉莉酸 ZIM 结构域蛋白的降解,导致 JA 信号传导受损并增加昆虫吸引力。BYSMV P6 的过度表达还抑制转基因拟南芥 (Arabidopsis thaliana) 植物中的 JA 信号传导以吸引昆虫。我们的结果深入了解植物细胞杆状病毒如何破坏植物 JA 信号传导以吸引昆虫媒介。
更新日期:2022-06-30
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