从广东省河源市连平县采集3份疑似双生病毒侵染引起的叶片表现黄花叶症状构树样品,提取总DNA,利用Bego-movirus通用引物AV494/CoPR进行PCR检测表明,疑似病样中均检测到菜豆金色黄花叶病毒属病毒。进一步选取PCR检测为阳性的样品进行RCA...从广东省河源市连平县采集3份疑似双生病毒侵染引起的叶片表现黄花叶症状构树样品,提取总DNA,利用Bego-movirus通用引物AV494/CoPR进行PCR检测表明,疑似病样中均检测到菜豆金色黄花叶病毒属病毒。进一步选取PCR检测为阳性的样品进行RCA扩增、酶切、克隆及测序,获得侵染广东构树的病毒分离物基因组全长序列。广东构树分离物(GS-2021)为一个双组分病毒,包含DNA-A和DNA-B两组分。DNA-A组分(GS-2021-A)全长为2777 nt,编码7个ORFs;DNA-B组分(GS-2021-B)为2742 nt,编码2个ORFs。GS-2021与已报道的中国大青金色花叶病毒(clerodendrum golden mosaic China virus,ClGMCNV)各分离物的DNA-A、DNA-B均有较高的一致性,全长序列的一致性分别为93.0%~93.9%和86.3%~89.6%,其中与福建Fz7分离物DNA-A(GenBank登录号:FJ011668)和DNA-B(GenBank登录号:FJ011669)的相一致性最高,为93.9%和89.6%。GS-2021与ClGMCNV福建、浙江、江苏和美国的5个分离物亲缘关系近,同属一个分支,其中与福建Fz7分离物聚集在一个小分支,亲缘关系最近。基因重组分析显示,GS-2021无明显的基因重组事件存在。根据ICTV对菜豆金色黄花叶病毒属病毒最新分类标准,GS-2021属ClGMCNV的一个新株系。本研究首次在构树上检测到菜豆金色花叶病毒属病毒,获得其病毒基因组全序列,明确其为ClGMCNV的新株系。因此,构树是菜豆金色黄花叶病毒属病毒的新自然寄主。展开更多
The diseased sample G7 was collected from Ageratum plants showing yellow vein symptoms in Xialian,Nanning,Guangxi province and tested with primers specific for DNA-A of several geminiviruses by polymerase chain reacti...The diseased sample G7 was collected from Ageratum plants showing yellow vein symptoms in Xialian,Nanning,Guangxi province and tested with primers specific for DNA-A of several geminiviruses by polymerase chain reaction.The results showed that mixed infection of begomoviruses appeared in G7 sample.Partial DNA-A sequence comparison with other geminiviruses showed that G7 sample was infected by 5 dif-ferent begomoviruses,they were Papaya leaf curl China virus(PaLCuCNV),Ageratum yellow vein China virus(AYVCNV),Tomato leaf curl China virus(ToLCCNV),Euphorbia leaf curl virus(EuLCV) and Tobacco leaf curl Yunnan virus(TbLCYNV).展开更多
文摘从广东省河源市连平县采集3份疑似双生病毒侵染引起的叶片表现黄花叶症状构树样品,提取总DNA,利用Bego-movirus通用引物AV494/CoPR进行PCR检测表明,疑似病样中均检测到菜豆金色黄花叶病毒属病毒。进一步选取PCR检测为阳性的样品进行RCA扩增、酶切、克隆及测序,获得侵染广东构树的病毒分离物基因组全长序列。广东构树分离物(GS-2021)为一个双组分病毒,包含DNA-A和DNA-B两组分。DNA-A组分(GS-2021-A)全长为2777 nt,编码7个ORFs;DNA-B组分(GS-2021-B)为2742 nt,编码2个ORFs。GS-2021与已报道的中国大青金色花叶病毒(clerodendrum golden mosaic China virus,ClGMCNV)各分离物的DNA-A、DNA-B均有较高的一致性,全长序列的一致性分别为93.0%~93.9%和86.3%~89.6%,其中与福建Fz7分离物DNA-A(GenBank登录号:FJ011668)和DNA-B(GenBank登录号:FJ011669)的相一致性最高,为93.9%和89.6%。GS-2021与ClGMCNV福建、浙江、江苏和美国的5个分离物亲缘关系近,同属一个分支,其中与福建Fz7分离物聚集在一个小分支,亲缘关系最近。基因重组分析显示,GS-2021无明显的基因重组事件存在。根据ICTV对菜豆金色黄花叶病毒属病毒最新分类标准,GS-2021属ClGMCNV的一个新株系。本研究首次在构树上检测到菜豆金色花叶病毒属病毒,获得其病毒基因组全序列,明确其为ClGMCNV的新株系。因此,构树是菜豆金色黄花叶病毒属病毒的新自然寄主。
文摘The diseased sample G7 was collected from Ageratum plants showing yellow vein symptoms in Xialian,Nanning,Guangxi province and tested with primers specific for DNA-A of several geminiviruses by polymerase chain reaction.The results showed that mixed infection of begomoviruses appeared in G7 sample.Partial DNA-A sequence comparison with other geminiviruses showed that G7 sample was infected by 5 dif-ferent begomoviruses,they were Papaya leaf curl China virus(PaLCuCNV),Ageratum yellow vein China virus(AYVCNV),Tomato leaf curl China virus(ToLCCNV),Euphorbia leaf curl virus(EuLCV) and Tobacco leaf curl Yunnan virus(TbLCYNV).
