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Special Issue:
植物病毒Plant Virus
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Molecular and biological characterization of melon-infecting squash leaf curl China virus in China |
WU Hui-jie1, 2, LI Meng3, HONG Ni2, PENG Bin1, GU Qin-sheng1 |
1 Zhengzhou Fruit Research Institute, Chinese Academy of Agricultural Sciences, Zhengzhou 450009, P.R.China
2 Huazhong Agricultural University, Wuhan 430070, P.R.China
3 School of Food and Bioengineering, Zhengzhou University of Light Industry, Zhengzhou 450000, P.R.China |
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Abstract It has been reported that squash leaf curl China virus (SLCCNV) infects some Cucurbitaceae crops except for melon (Cucumis melo L.). A new disease of melon exhibiting severe leaf curl and dwarfing was observed in Hainan Province of China. In this study, the pathogen was identified as SLCCNV through biological and molecular characterization. The isolate (SLCCNV-HN) possess a bipartite genome, DNA-A (HM566112.1) with the highest nucleotide identity (99%) to SLCCNV-Hn (MF062251.1) pumpkin and SLCCNV-Hn61 (AM260205.1) squash isolates from China, whereas DNA-B (HM566113.1) with the highest nucleotide identity (99%) to SLCCNV-Hn (MF062252.1). Phylogenetic analyses based on the full-length SLCCNV-HN DNA-A and -B sequences indicated that SLCCNV-HN melon isolate is clustered with SLCCNV-Hn pumpkin, SLCCNV-Hn61 and SLCCNV-SY squash isolates from southern China, forming an independent cluster. Infectious clone of SLCCNV-HN was constructed and the melon plants were inoculated and the infection rate is 100%, the systemic symptoms in melon showed identical to those of melon plants infected in fields. Additionally, melon plants transmission of this virus by Bemisia tabaci with a transmission rate of 95% (19/20) showed leaf curl and dwarf symptoms 15 days post transmission, thereby fulfilling Koch’s postulates. Analysis of genomic organization and phylogenetic trees indicated that SLCCNV-HN melon isolate belongs to the Begomovirus genus. To the best of our knowledge, this is the first characterization of melon-infecting SLCCNV through its genome, infectious clone and transmission.
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Received: 29 November 2018
Accepted:
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| Fund: This work was supported by the National Natural Science Foundation of China (31701941 and 31401810), the grants from the earmarked fund for China Agriculture Research System (CARS-26-13), the Agricultural Science and Technology Innovation Program of Chinese Academy of Agricultural Sciences (ASTIP) (CAAS-ASTIP-2018-ZFRI-08). |
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Corresponding Authors:
Correspondence GU Qin-sheng, E-mail: guqinsheng@caas.cn
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| About author: WU Hui-jie, E-mail: wuhuijie@caas.cn, |
Cite this article:
WU Hui-jie, LI Meng, HONG Ni, PENG Bin, GU Qin-sheng.
2020.
Molecular and biological characterization of melon-infecting squash leaf curl China virus in China . Journal of Integrative Agriculture, 19(2): 570-577.
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