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A flexuous rod-shaped virus was isolated from Cucurbita pepo leaves showing as green mosaic and puckering symptoms at Anseong, Korea. Based on the biological analysis, electron microscopy, and reverse transcription- polymerase chain reaction (RT-PCR), the virus isolate was identified as Papaya ringspot virus type watermelon (PRSV-W). From biological analysis, the host range of PRSV-W was limited to the families Cucurbitaceae and Chenopodiaceae. Most susceptible cucurbit species, such as Cucumis lanatus, Cucumis sativus, Cucurbita pepo, and Citrullus lanatus, showed symptoms of green mosaic, malformation, puckering, and narrow laminae by infection with PRSV-W. The local lesion were showed on the inoculated leaves of both Chenopodium amaranticolor and C. quinoa. Field survey of PRSV, Watermelon mosaic virus (WMV) and Zucchini yellow mosaic virus (ZYMV), three major viruses infecting cucurbit, was done during 2001 to 2003 on 173 commercial cucurbit cultivating fields distributed over the three regions of Gyeonggi, Gyeongbuk and Jeonnam Provinces where cucurbits are grown in different environmental conditions and cropping patterns. Typical viral symptoms were observed from 107 cultivating fields, and all three kinds of potyviruses were detected from 206 samples out of the 235 samples using RT-PCR. Watermelon mosaic virus (WMV) and Zucchini yellow mosaic virus (ZYMV) are the most widely distributed viruses in outdoor and retarding-culture fields, at an infection rating of 48 and 33 percents, respectively. PRSV was detected from 12 percent of 235 samples. The nucleotide and amino acid sequences of coat proteins (CP) of eight PRSV isolates, collected from several areas including Anseong, were determined and sequenced heterogeneity among the isolates was performed. The CP gene of PRSV showed 88.6~97.3 percent homology in nucleotide sequences and 95.1~99.3 percent homology in amino acid sequences with other PRSV isolates worldwide. The phylogenetic analysis indicated that the Korean PRSV isolates belong to the southern-east Asian cluster.


안성에서 모자이크와 주름증상을 보이는 호박으로부터 사상형 바이러스가 분리되었으며, 생물학적 특성과 전자현미경 검정, RT-PCR 검정에 의해 파파야원형반점바이러스(Papaya ringspot virus) 수박계통(PRSV-W)으로 동정되었다. PRSV-W의 기주범위는 박과작물과 명아주과작물에 한정되었고 감수성 기주인 오이, 호박, 수박 등에는 녹색모자이크, 기형, 주름 등의 증상을 나타냈지만 명아주과의 기주에는 국부병징만을 나타냈다. 2001년에서 2003년에 걸쳐, 경기, 경북, 전남에서 다양한 작형의 박과작물이 재배되는 173지역에서 박과작물의 주요 바이러스인 PRSV, 수박모자이크바이러스(WMV), 쥬키니황화모자이크바이러스(ZYMV)와 오이모자이크바이러스(CMV) 등 4종 바이러스의 발생상황을 조사하였다. 173지역 중 107지역에서 수집한 시료로부터 바이러스 병징이 관찰되었으며 RT-PCR 검정 결과, 235점의 시료 중 206시료에서 3종의 바이러스가 검출되었다. 검출빈도는 WMV가 48%, ZYMV가 33%였으며, PRSV는 12%였다. 8종 PRSV 시료의 핵산과 외피단백질 아미노산을 분석하였다. 분석된 결과를 전세계의 다른 PRSV 계통과 유사도를 비교한 결과, 핵산은 88.6~97.3%, 아미노산은 95.1~99.3%로 조사되었다. 이들 분리주의 유연관계를 분석한 결과, PRSV-W는 남동 아시아 계통과 근연종으로 판명되었다.