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Poster: Diseases of Plants: Disease Detection & Diagnosis


Trichosanthes latent virus (TrLV), a novel potyvirus from Trichosanthes cucumeroides in Japan
O. KIM (1), K. Kobayashi (2), K. Natsuaki (2), H. Shinohara (2), H. Negishi (2) (1) Tokyo University of Agriculture (TUA), Japan; (2) Tokyo University of Agriculture (TUA), Japan

Only a few studies have been conducted on incidence of plant viruses on wild cucurbit weeds in Japan. As wild and horticultural cucurbits often share same viruses, epidemiological survey as well as precise identification of causal virus(es) is required for the efficient control strategy. We once reported un-common potyvirus tentatively named as JK virus isolated from Trichosanthes cucumeroides (Kim et al., 2011). By additional surveys, most of collected T. cucumeroides in Kanto region were found to be infected with JK virus showing high co-incidence with Papaya ringspot virus (PRSV).On the contrary, as far as examined, JK virus was not detected from any wild cucurbit samples including Trichosanthes spp. in Okinawa Prefecture where Papaya leaf distortion mosaic virus (PLDMV) infection on cucurbit weeds have been reported (Maoka and Hataya, 2005). Mechanical inoculation of JK virus indicated a narrow host range limited to family Cucurbitaceae and showed symptomless or mild symptom when back-inoculated to T. cucumeroides. Compared with sequences of CI or CP regions from other potyviruses, JK virus shared less than 80 % identity with PLDMV which was the most closely related potyvirus. Therefore, JK virus can be considered as a novel potyvirus species, for which the name as Trichosanthes latent virus (TrLV) is proposed.