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对香蕉束顶病毒（ＢＢＴＶ）中国分离株ＤＮＡ组份Ｉ（ＤＮＡ１）、外壳蛋白（ＣＰ）和运转蛋白（ＭＰ）基因进行了克隆和序列分析。ＢＢＴＶＤＮＡ１含有１１０３个核苷酸，与南太平洋和亚洲分离株分别有８７％８８％和９６％９８％的核苷酸序列同源性。由ＤＮＡ１编码的复制酶含有１８６个氨基酸残基，与南太平洋和亚洲分离株分别有９４４％９５８％和９７６％９８．０％的氨基酸序列同源性。外壳蛋白基因由５１０个核苷酸组成，与澳大利亚分离株有９２５％的核苷酸序列同源性和９８８％的氨基酸序列同源性。运转蛋白基因由３４８个核苷酸组成，与澳大利亚分离株有９０６％的核苷酸序列同源性和８７９％的氨基酸序列同源性。通过比较中国分离株和其它国家分离株的ＤＮＡ１、ＣＰ和ＭＰ基因的核苷酸序列，进一步证明ＢＢＴＶ分离株明显可分为南太平洋和亚洲两组。但是两组分离株ＣＰ基因的氨基酸序列是很相似的。
The DNA components I (DNA1), coat protein (CP) and prolactin (MP) genes of Chinese banana bunchy top virus (BBTV) were cloned and sequenced. BBTVDNA-1 contains 1103 nucleotides, which share 87% 88% and 96% 98% nucleotide sequence homology with the South Pacific and Asian isolates, respectively. The replicase encoded by DNA1 contained 186 amino acid residues, which shared 944% 958% and 976% 98.0% amino acid homology with the South Pacific and Asian isolates, respectively. The coat protein gene consists of 510 nucleotides and has 92.5% nucleotide sequence homology and 98.8% amino acid sequence homology with the Australian isolate. The protoxin gene consists of 348 nucleotides, with 90.6% nucleotide sequence homology and 87.9% amino acid sequence homology with the Australian isolate. By comparing the nucleotide sequences of DNA1, CP and MP in Chinese isolates and other national isolates, it was further proved that the BBTV isolates were obviously divided into two groups: the South Pacific and Asia. However, the amino acid sequences of the CP genes of the two isolates were very similar.