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The Rate of Cell-to-Cell Movement in Squash of Cucumber Mosaic Virus Is Affected by Sequences of the Capsid Protein

July 1999 , Volume 12 , Number  7
Pages  628 - 632

Sek-Man Wong , 1 Sharon Swee-Chin Thio , 1 Michael H. Shintaku , 2 and Peter Palukaitis 2 , 3

1Department of Biological Sciences, National University of Singapore, Kent Ridge, Singapore 119260; 2Department of Plant Pathology, Cornell University, Ithaca, NY 14853, U.S.A.; 3Virology Department, Scottish Crop Research Institute, Invergowrie, Dundee DD2 5DA, U.K.

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Accepted 6 March 1999.

The M strain of cucumber mosaic virus (CMV) does not infect squash plants systemically and moves very slowly in inoculated cotyledons. Systemic infection and an increase in the rate of local movement were observed when amino acids 129 or 214 of the M-CMV capsid protein (CP) were altered to those present in the Fny strain of CMV. While the opposite alterations to the CP of Fny-CMV inhibited systemic infection of squash, they did not show the same effects on the rates of both cell-to-cell and long-distance movement. However, the ability of CMV to infect squash systemically was affected by the rate of cell-to-cell movement.

© 1999 The American Phytopathological Society