根据已报道的番茄花叶病毒Ｌ株系（ＴｏＭＶＬ）序列人工合成引物，经ＲＴＰＣＲ扩增并克隆了我国番茄花叶病毒分离物（ＴｏＭＶＳ１）的外壳蛋白ＣＰ基因及３′端非编码区。序列测定结果表明，所得ｃＤＮＡ共长６８２个核苷酸，其中ＣＰ基因含４８０个核苷酸，编码１５８个氨基酸，３′端非编码区含２０２个核苷酸，其核苷酸序列与ＴｏＭＶＬ株系具有９９．５％的同源率。将该基因片段克隆到ｐＧＥＭＥＸ１载体中，转入Ｅ．ｃｏｌｉ后诱导表达，经Ｗｅｓｔｅｒｎｂｌｏｔ检测证明，该基因已在大肠杆菌中正确表达。这是我国首次报道ＴｏＭＶＣＰ基因序列。

The coat protein (CP) gene and 3′noncoding region of tomato mosaic virus Sl isolate (ToMV Sl) were amplified by RT PCR with specific primers designed on the basis of reported ToMV L strain (ToMV L) sequence. The cDNA fragment was cloned and sequenced,its sequence showed that the CP gene has 480 nucleotides in length, which encodes 158 amino acids and 3′ noncoding region contains 202 nucleotides. The nucleotide sequence of ToMV Sl showed 99.5% homology when compared with that of ToMV L and 76.2% homology when compared with that of TMV Ul. The CP gene was inserted into pGEMEX 1, Western immuno blot showed that this gene was expressed in E.coli with the proper reading frame. The gene was also inserted into plant expression vector pBI121.