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Banana streak virus  (BSV) belongs to the members of the genus  Badnavirus , family  Caulimoviridae . At present, BSV contains nine species in the International Committee on Taxonomy of Viruses (ICTV) classification report (2018b release). Previous study indicated that the viral particles of  Banana streak virus Acuminata Yunnan  (BSV-Acum) were purified from banana (Cavendish  Musa  AAA group) leaves in Yunnan Province, China, and its complete genome was obtained. To further determine whether this sample infecting with  Banana streak GF virus  (BSGFV), the polymerase chain reaction (PCR) cloning and complete genome analysis of the  Banana streak GF virus  Yunnan isolate (BSGFV-YN) isolate were carried out in this study. The result showed that BSGFV-YN infecting Cavendish  Musa  AAA group was co-infecting this sample. Its genome contains a total of 7,325 bp in length with 42% GC content. This complete genome sequence was deposited in GenBank under accession number  MN296502 . Sequence analysis showed that the complete genome of BSGFV-YN was 98.14% sequence similarity to BSGFV Goldfinger, while it was 49.10–57.09% to other BSV species. Two phylogenetic trees based on the complete genome and ORFIII polyprotein indicated that BSGFV-YN and other BSV species clustered into a group, while it was the highest homology with BSGFV Goldfinger. Although BSGFV-YN and BSGFV Goldfinger were highly homologous, their cultivating bananas are different. The former cultivating banana was from Cavendish  Musa  AAA group, while the latter cultivating banana was from Goldfinger  Musa  AAAB group. Compared with BSGFV Goldfinger, the genome of BSGFV-YN has an extra multiple repetitive sequences in the intergenetic region between  ORFIII  and  ORF I, suggesting that this region might be related to host selection. In summary, a BSGFV-YN distant from BSV-Acum was identified from the same sample, and its complete genome sequence was determined and analyzed. The study extends the polymorphism of BSVs in China and provides scientific clue for the evolutionary relationship with host selection of badnaviruses.

The complete genome of Banana streak GF virus Yunnan isolate infecting Cavendish Musa AAA group in China