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琼脂双扩散血清试验表明，参试的我国花生矮化病毒（ＰＳＶ）６个分离物和株系之间血清学关系十分亲近，而与美国ＰＳＶ－Ｅ和ＰＳＶ－Ｗ株系存在明显的差异。完成对花生致病力不同的ＰＳＶ－Ｍｉ和ＰＳＶ－Ｓ两个株系壳蛋白（ＣＰ）基因的ＲＴ－ＰＣＲ扩增、克隆和序列分析。两个株系ＣＰ基因均含６５４个核苷酸，编码２１８个氨基酸。两株系之间ＣＰ基因核苷酸序列同源性为９９．１％，推导的ＣＰ氨基酸序列同源性为９９．５％。与已报道的ＰＳＶ亚组ＩＰＳＶ－ＥＲ和ＰＳＶ－Ｊ株系ＣＰ基因核苷酸序列同源性为７５．７％～７７．８％，与ＰＳＶ亚组ⅡＰＳＶ－ＷＣＰ基因核苷酸序列同源性为７４．３％－７４．６％。鉴于我国ＦＳＶ株系血清学性质和ＣＰ基因核苷酸序列同源性与ＰＳＶ两个亚组的ＰＳＶ株系存在明显的差异，建议将我国ＰＳＶ株系划为一个新的ＰＳＶ亚组，即ＰＳＶ亚组－Ⅲ。
The results of agar double-diffusion assay showed that the serological relationships among the six isolates of peanut dwarf virus (PSV) tested in our country were very close to each other, but significantly different from the strains of PSV-E and PSV-W in the United States. Complementation of the RT-PCR amplification, cloning and sequence analysis of the capsid (CP) genes of two strains of PSV-Mi and PSV-S with different pathogenicity. Both strains of CP gene contain 654 nucleotides, encoding 218 amino acids. The CP gene nucleotide sequence homology between the two strains was 99.1%, and the deduced CP amino acid sequence homology was 99.5%. The homology of nucleotide sequence of CP gene to IPSV-ER and PSV-J strains reported in PSV subgroup was 75.7% -77.8%, which was homologous with PSV subgroup Ⅱ PSV-WCP gene nucleotide sequence Sex is 74.3% -74.6%. In view of the significant differences in the serological characteristics and CP gene nucleotide sequence homology between FSV strains and PSV strains in our two subgroups, it is suggested that PSV strains in our country should be classified as a new PSV subgroup, namely PSV Subgroup-III.