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Complete genome sequence of a divergent strain of cardamom mosaic virus
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Complete genome sequence of a divergent strain of cardamom mosaic virus
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Journal Article
Complete genome sequence of a divergent strain of cardamom mosaic virus
2023
Overview
Cardamom mosaic virus (CdMV; genus Macluravirus), which causes mosaic (katte) disease in cardamom, is a highly variable member of the family Potyviridae. So far, the complete genome sequence of one isolate from Karnataka (KS) has been reported. In the present study, we determined the complete genome sequence of a CdMV isolate from Kerala (KI) and the complete CP gene sequences of nine isolates of CdMV from Kerala, Karnataka, and Tamil Nadu, India. The complete genome of CdMV (KI) consists of 8255 nucleotides (nt) with two open reading frames (ORFs). The large ORF, potentially coding for a polyprotein of 2638 amino acids (aa), is further processed into nine mature proteins at eight cleavage sites. The second ORF, PIPO (pretty interesting Potyviridae ORF) starting with a C(A)6 motif, encodes a small protein of 56 aa. The viral genome contains an additional 13 nt in the 5′ untranslated region (UTR) and 6 nt in the CP gene, as well as a deletion of 13 nt at the 3′ UTR in comparison to the KS isolate of CdMV. The complete viral genome and polyprotein share 76% and 85% sequence identity with the KS isolate of CdMV, indicating that the present isolate is highly divergent from the KS isolate. Sequencing and analysis of the CP sequences of 16 CdMV isolates from different regions revealed high heterogeneity among them, suggesting that they should be considered members of more than one species.
Publisher
Springer Nature B.V
