The 3’ terminal genomic 1 611 nucleotides of Beet mosaic virus Xinjiang isolate(BtMV-XJ)from China was determined(GenBank accession number DQ345522).The sequence started within a single open reading frame which was expected to encode part C-terminus of NIb protein of 201 amino acids,complete capsid protein(CP)of 276 amino acids and followed by a 3’ untranslated region(UTR)of 168 nucleotides.The comparison of sequence diversity among BtMV-XJ and other three previously reported isolates revealed that it shared 98.3%,98.1%,91.4% nucleotide identity,and 99.79%,99.58%,97.69% deduced aa sequence identity with the corresponding 3’ terminal regions of BtMV-SL,BtMV-UK and BtMV-US,respectively,and that most nucleotide mutations were silent with no effect on aa sequence.In addition,a virus-specific and ra-pid RT-PCR detection method of BtMV was also developed based on the nucleotide sequence obtained.
