Abstract
Hop mosaic virus (HMV) was isolated from a mosaic-diseased hop plant (Humulus lupulus L. cv. Sunshine). The virus systemically infected two plant species, hop (cv. Shinshuwase) and Nicotiana occidentalis and only the inoculated leaves of N. clevelandii, Chenopodium quinoa, Cucurbita maxima among 24 species of 11 families. The virus was purified from infected leaves of N. occidentalis, a new host suitable for propagation of HMV. Purified virus particles were 625nm in length, 13nm in width and composed of a single coat protein species with Mr 32, 800 daltons (Da) and a nucleic acid with Mr 2.91×106 Da. In immunosorbent electron microscopy using antisera against three carlaviruses (HMV, hop latent virus: HLV and American hop mosaic virus) the virus isolated in this study reacted with an antiserum against HMV isolated in England and also weakly with antisera against HLVs isolated in Japan and England. The survey of HMV infection in commercial hop plants indicated that HMV did not occur in hop gardens in Japan though some cultivars introduced for breeding are infected with the virus.
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