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  • Title: Identification of a new Apscaviroid from Japanese persimmon.
    Author: Nakaune R, Nakano M.
    Journal: Arch Virol; 2008; 153(5):969-72. PubMed ID: 18365126.
    Abstract:
    Three viroid-like sequences were detected from Japanese persimmon (Diospyrus kaki Thunb.) by RT-PCR using primers specific for members of the genus Apscaviroid. Based on the sequences, we determined the complete genomic sequences. Two had 92.1-94.3% sequence identity with citrus viroid OS (CVd-OS) and 91.4-96.3% identity with apple fruit crinkle viroid (AFCVd), respectively. Another one, tentatively named persimmon viroid (PVd), had 396 nucleotides and less than 70% sequence identity with known viroids. The secondary structure of PVd is proposed to be rod-like with extensive base pairing and contains the terminal conserved region and the central conserved region characteristic of the genus Apscaviroid. Moreover, we confirmed that the viroids, including PVd, are graft transmissible from persimmon to persimmon and that persimmon is a natural host of these viroids. According to its molecular and biological properties, PVd should be considered a member of a new species in the genus Apscaviroid.
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