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Characterization of Melon necrotic spot virus Occurring on Watermelon in Korea
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  • Journal title : The Plant Pathology Journal
  • Volume 31, Issue 4,  2015, pp.379-387
  • Publisher : Korean Society of Plant Pathology
  • DOI : 10.5423/PPJ.OA.11.2014.0124
 Title & Authors
Characterization of Melon necrotic spot virus Occurring on Watermelon in Korea
Kwak, Hae-Ryun; Kim, Jeong-Soo; Cho, Jeom-Deog; Lee, Joong-Hwan; Kim, Tae-sung; Kim, Mi-Kyeong; Choi, Hong-Soo;
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Melon necrotic spot virus (MNSV) was recently identified on watermelon (Citrullus vulgaris) in Korea, displaying as large necrotic spots and vein necrosis on the leaves and stems. The average occurrence of MNSV on watermelon was found to be 30-65% in Hapcheon and Andong City, respectively. Four isolates of the virus (MNSV-HW, MNSV-AW, MNSV-YW, and MNSV-SW) obtained from watermelon plants in different areas were non-pathogenic on ten general indicator plants, including Chenopodium quinoa, while they infected systemically six varieties of Cucurbitaceae. The virus particles purified by 10-40% sucrose density gradient centrifugation had a typical ultraviolet spectrum, with a minimum at 245 nm and a maximum at 260 nm. The morphology of the virus was spherical with a diameter of 28-30 nm. Virus particles were observed scattered throughout the cytoplasm of watermelon cells, but no crystals were detected. An ELISA was conducted using antiserum against MNSV-HW; the optimum concentrations of IgG and conjugated IgG for the assay were and a 1:8,000-1:10,000 dilutions, respectively. Antiserum against MNSV-HW could capture specifically both MNSV-MN from melon and MNSV-HW from watermelon by IC/RT-PCR, and they were effectively detected with the same specific primer to produce product of 1,172 bp. The dsRNA of MNSV-HW had the same profile (4.5, 1.8, and 1.6 kb) as that of MNSV-MN from melon. The nucleotide sequence of the coat protein of MNSV-HW gave a different phylogenetic tree, having 17.2% difference in nucleotide sequence compared with MNSV isolates from melon.
Melon necrotic spot virus;purification;phylogenetic tree;watermelon;symptom;
 Cited by
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