大豆花叶病毒山西半夏分离物全基因组序列分析
崔丽艳 , 杨佼丽 , 柳建丽 , 侯钥 , 郭成英 , 王德富 , 牛颜冰
山西农业科学 ›› 2025, Vol. 53 ›› Issue (04) : 109 -120.
大豆花叶病毒山西半夏分离物全基因组序列分析
Analysis of the Complete Genome Sequence of Soybean Mosaic Virus Shanxi Pinellia ternata Isolate
大豆花叶病毒(SMV)在大豆生产中会造成产量和品质的严重下降,具有传播广泛和致病性强的特点,但宿主范围相对较窄,以豆科植物为主。近年来研究却表明,SMV能够跨科侵染天南星科植物半夏(Pinellia ternata)。为明确侵染山西半夏的大豆花叶病毒分离物(SMV-SXBX)的基因组特征,采用生物信息学软件对侵染山西半夏的SMV-SXBX进行了序列相似性分析、系统进化分析、氨基酸功能位点分析和重组分析。序列相似性分析结果表明,SMV-SXBX与SMV-Hangzhou分离物(GenBank登录号:AJ507388.2)的相似性最高,核苷酸序列相似性为92.09%,氨基酸序列相似性为95.91%;系统进化分析结果显示,SMV-SXBX与SMV-Hangzhou分离物聚为一簇,亲缘关系最近。在SMV-SXBX基因组中,P1蛋白的序列差异性最大,核苷酸和氨基酸序列差异性分别为34.93%和36.28%。突变与氨基酸功能分析结果表明,SMV-SXBX氨基酸序列中存在多个氨基酸突变位点;重组分析结果表明,SMV-SXBX在3 056—6 895 bp处有重组事件的发生,主要亲本为SMV-HZ1分离物(GenBank登录号:AJ628750.1),次要亲本为SMV-XFQ008分离物(GenBank登录号:KP710873.1)。综上研究结果,明确了SMV-SXBX的基因组特征,其发生的氨基酸突变及基因重组可能是导致大豆花叶病毒跨科侵染半夏的原因之一。
Soybean mosaic virus(SMV) can cause a serious decline in yield and quality in soybean production. It has the characteristics of wide spread and strong pathogenicity, but the host range is relatively narrow, mainly legumes. In recent years, studies have shown that SMV can cross-family infect Pinellia ternata. In order to clarify the genomic characteristics of soybean mosaic virus isolate infecting P. ternata in Shanxi province(SMV-SXBX), in this study, bioinformatics software was used to analyze the sequence similarity, phylogenetic analysis, amino acid functional site analysis, and recombination analysis of SMV-SXBX. Sequence similarity analysis showed that SMV-SXBX had the highest similarity with SMV-Hangzhou isolate(GenBank accession number: AJ507388.2), and the nucleotide sequence similarity was 92.09 %, the amino acid sequence similarity was 95.91 %. Phylogenetic analysis also showed that SMV-SXBX and SMV-Hangzhou isolates were clustered together and had the closest genetic relationship. In the SMV-SXBX genome, the sequence difference of P1 protein was the largest, and the nucleotide and amino acid sequence differences were 34.93% and 36.28%, respectively. Mutation and amino acid function analysis showed that there were multiple amino acid mutation sites in the SMV-SXBX amino acid sequence. Recombination analysis showed that SMV-SXBX had a recombination event at 3 056-6 895 bp. The major parent was SMV-HZ1 isolate(GenBank accession number: AJ628750.1), and the minor parent was SMV-XFQ008 isolate(GenBank accession number: KP710873.1). In summary, the results clarified the genomic characteristics of SMV-SXBX, and the amino acid mutations and gene recombination may be the reason why SMV-SXBS can cross-family infect P. ternata.
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