Abstract：
:Sugarcane bacilliform virus (SCBV), which causes leaf freckle in sugarcane, is a member of the genus Badnavirus. Studies were conducted to characterize SCBV in Saccharum officinarum germplasm and cultivated varieties in India by sequencing the complete genomes of five isolates. Genome lengths ranged from 7,553 to 7,884 nucleotides. Duplications in ORF3 and insertions in the RNase H-domain in some of the isolates were found to contribute to the large size of their genomes. The Indian SCBV isolates share identities of 69-85 % for the complete genomic sequence, indicating wide genetic diversity among them, and share 70-82 % identity with Sugarcane bacilliform Ireng Maleng virus (SCBIMV) and Sugarcane bacilliform Morocco virus (SCBMV), as well as 43-46 % identity with Banana streak virus (BSV) and BSV-related SCBV species from Guadeloupe, indicating that the Indian SCBV isolates are distinct from SCBV isolates reported to date. Irrespective of the region compared, SCBV isolates from India, Australia, and Morocco clustered together. BSV and BSV-related SCBV isolates from Guadeloupe formed another cluster. A phylogenetic analysis based on the partial RT/RNase H-sequence separated SCBV and BSV-related SCBV sequences into 11 SCBV groups viz. SCBV-A to -K. Among the 11 groups, the SCBV sequences separated under H, I, J, and K are newly identified in this study, representing three new species and are tentatively named as SCBBBV, SCBBOV, and SCBBRV. Thus, the PASC and phylogenetic analyses evidenced that the symptoms associated with badnaviruses in sugarcane in India are caused by at least three new species, SCBBBV, SCBBOV, and SCBBRV, besides SCBIMV and SCBMV represented by SCBV-BT and SCBV-Iscam, respectively.
journal_name
Virus Genesjournal_title
Virus genesauthors
Karuppaiah R,Viswanathan R,Kumar VGdoi
10.1007/s11262-013-0890-6subject
Has Abstractpub_date
2013-06-01 00:00:00pages
505-16issue
3eissn
0920-8569issn
1572-994Xjournal_volume
46pub_type
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