タマネギ(Allium cepa)から分離されたIris yellow spot virus (IYSV)の遺伝的特性およびIYSV2系統のタマネギおよびネギ(Allium schoenoprasum)に対する病原性

概要

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Iris yellow spot virus (IYSV) was isolated from onion with streaks on leaves in Saga and Chiba prefectures, Japan. Phylogenetic analysis based on the amino acid sequence identities of the nucleocapsid genes showed the presence of two strains, as represented by an isolate from onion in Brazil (IYSV_<BR>) and that from Dutch iris (Iris hollandica) in the Netherlands (IYSV_<NL>), on onion in Japan. Pathogenicity was tested on 11 cultivars of onion and five of leaf onion by mechanical inoculation with either of the two IYSV isolates, which were genetically similar with IYSV_<BR> and IYSV_<NL>, respectively. Both isolates caused the same type of streaks only on inoculated leaves of all onion cultivars tested, and the virus was not detected in upper leaves. None of the leaf onions developed symptoms on either inoculated or upper leaves, even though IYSV was detected in the inoculated leaves. Onion thrips (Thrips tabaci) transmission to onion, leaf onion, wakegi (Allium wakegi) and shallot (Allium grayi) was examined, and IYSV was detected from onion leaves where thrips fed.
日本植物病理学会の論文
2005-05-25