Abstract
Zucchini shoestring virus (ZSSV) has been proposed to be a putative potyvirus in the papaya ringspot virus (PRSV) cluster, based on the sequence similarity of its coat protein to those of related potyviruses. ZSSV has been associated with the outbreak of a damaging disease of baby marrow (Cucurbita pepo L.) that had been observed throughout the province of KwaZulu-Natal, in the Republic of South Africa (RSA). We report the genome sequence of ZSSV, determined by next-generation sequencing of total RNA extracted from an infected baby marrow (Cucurbita pepo L.). The ZSSV genome is 10,295 nucleotides long excluding the poly(A) tail and displays a typical potyvirus organization. Algerian watermelon mosaic virus (AWMV; EU410442.1) was identified as the closest relative of ZSSV, sharing the highest nucleotide sequence identity of 65.68%. The nucleotide and amino acid sequence identity values for each protein support the differentiation of ZSSV as a member of a distinct species in the genus Potyvirus. This taxonomic position was also confirmed using the Pairwise Sequence Comparison online tool from the National Center for Biotechnology Information. Phylogenetic analysis of the polyprotein coding sequence of ZSSV grouped ZSSV together with AWMV and Moroccan watermelon mosaic virus, but in different clusters. ZSSV is the second cucurbit-infecting virus in the PRSV cluster present in RSA.
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