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Journal of General Virology (2002), 83, 3173-3178.
© 2002 Society for General Microbiology

Plant

Systemic movement of a movement-deficient strain of Cucumber mosaic virus in zucchini squash is facilitated by a cucurbit-infecting potyvirus

Seung Kook Choi1, Ju Yeon Yoon2, Ki Hyun Ryu2, Jang Kyung Choi3, Peter Palukaitis4 and Won Mok Park1

Graduate School of Biotechnology, Korea University, Seoul, 136-701, Korea1
Plant Virus GenBank, Department of Horticultural Science, Seoul Women’s University, Seoul, 139-774, Korea2
Division of Biological Environment, Kangwon National University, Chunchon 200-701, Korea3
Scottish Crop Research Institute, Invergowrie, Dundee DD2 5DA, UK4

Author for correspondence: Won Mok Park. Fax +82 2 923 9923. e-mail viroid{at}korea.ac.kr

Zucchini squash (Cucurbita pepo) is a systemic host for most strains of the cucumovirus Cucumber mosaic virus (CMV), although the long-distance movement of the M strain of CMV (M-CMV) is inhibited in some cultivars. However, co-infection of zucchini plants with M-CMV and the potyvirus Zucchini yellow mosaic virus strain A (ZYMV-A) allowed M-CMV to move systemically, as demonstrated by tissue-print analysis. These doubly infected plants exhibited severe synergism in pathology. Infection of zucchini squash by M-CMV and an attenuated strain of ZYMV (ZYMV-AG) showed a milder synergy in pathology, in which ZYMV-AG also facilitated the long-distance movement of M-CMV similar to that promoted by ZYMV-A. Variation in the extent of synergy in pathology by the two strains of ZYMV did not correlate with differences in levels of accumulation of either virus. Thus, the extent of synergy in pathology is at least in part independent of the resistance-neutralizing function of the potyvirus.




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