State Key Laboratory of Rice Biology, Institute of Biotechnology, Zhejiang University, Hangzhou 310029, People's Republic of China.
State Key Laboratory for Biology of Plant Diseases and Insect Pests, Institute of Plant Protection, Chinese Academy of Agricultural Sciences, Beijing, 100193, People's Republic of China.
Sci Rep. 2017 Jan 6;7:39960. doi: 10.1038/srep39960.
Maize chlorotic mottle virus (MCMV) was first reported in maize in China in 2009. In this study we further analyzed the epidemiology of MCMV and corn lethal necrosis disease (CLND) in China. We determined that CLND observed in China was caused by co-infection of MCMV and sugarcane mosaic virus (SCMV). Phylogenetic analysis using four full-length MCMV cDNA sequences obtained in this study and the available MCMV sequences retrieved from GenBank indicated that Chinese MCMV isolates were derived from the same source. To screen for maize germplasm resistance against MCMV infection, we constructed an infectious clone of MCMV isolate YN2 (pMCMV) and developed an Agrobacterium-mediated injection procedure to allow high throughput inoculations of maize with the MCMV infectious clone. Electron microscopy showed that chloroplast photosynthesis in leaves was significantly impeded by the co-infection of MCMV and SCMV. Mitochondria in the MCMV and SCMV co-infected cells were more severely damaged than in MCMV-infected cells. The results of this study provide further insight into the epidemiology of MCMV in China and shed new light on physiological and cytopathological changes related to CLND in maize.
玉米褪绿斑驳病毒(MCMV)于 2009 年在中国首次报道于玉米中。在本研究中,我们进一步分析了中国 MCMV 和玉米坏死性条纹病(CLND)的流行病学。我们确定在中国观察到的 CLND 是由 MCMV 和甘蔗花叶病毒(SCMV)的共同感染引起的。使用本研究中获得的四个全长 MCMV cDNA 序列和从 GenBank 中检索到的可用 MCMV 序列进行的系统发育分析表明,中国 MCMV 分离物源自同一来源。为了筛选对 MCMV 感染具有抗性的玉米种质,我们构建了 MCMV 分离物 YN2(pMCMV)的感染性克隆,并开发了一种农杆菌介导的注射程序,以允许高通量接种 MCMV 感染性克隆的玉米。电子显微镜显示,MCMV 和 SCMV 的共感染显著阻碍了叶片中叶绿体的光合作用。与 MCMV 感染细胞相比,MCMV 和 SCMV 共感染细胞中的线粒体受到更严重的损伤。本研究的结果进一步深入了解了中国 MCMV 的流行病学,并为玉米中与 CLND 相关的生理和细胞病理学变化提供了新的认识。