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One Shields Ave, Plant Pathology Dept, University of California, CA 95616 Davis, USA1
Faculty of Agricultural and Food Sciences, American University of Beirut, Lebanon2
Author for correspondence: Bryce Falk. Fax +1 5307525674. e-mail bwfalk{at}ucdavis.edu
The population structure and genetic variation of Cucurbit yellow stunting disorder virus (CYSDV) isolates were estimated by single-strand conformation polymorphism and nucleotide sequence analyses of the CYSDV coat protein gene. Analysis of 71 isolates collected from Spain, Jordan, Turkey, Lebanon, Saudi Arabia and North America showed that, from a genetic viewpoint, these isolates could be divided into two diverged subpopulations: an Eastern subpopulation composed of Saudi Arabian isolates and a Western subpopulation containing the rest of the CYSDV isolates. The genetic variation within the Western subpopulation was very small (nucleotide identity >99%) in spite of the extensive and discontinuous geographical distribution and different years of collection. We also estimated the within-isolate genetic structure and variation of three CYSDV isolates by analysing 30 clones per isolate. Our results showed that these CYSDV isolates had a quasispecies structure.
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