Begomoviruses vectored by the sweetpotato whitefly (Bemisia tabaci) are a major threat to tomato (Solanum lycopersicum) production in many regions around the world. Of the many begomoviruses, the strains that cause Tomato yellow leaf curl virus (TYLCV) are the most widespread and well known. TYLCV resistant cultivars are commercially available in production regions, and most of these use the dominant Ty-1 gene that was introgressed from S. chilense accession LA1969. Producers in Florida often prefer to grow susceptible cultivars because of linkage drag effects that lower marketable yield and increase foliar disease infections. The Ty-3 gene, introgressed from S. chilense accessions LA2779 and LA1932, was recently found to be allelic to Ty-1 (Verlaan et al., 2013). Linkage drag in the form of increased foliar disease and reduced yield has also been a problem in lines possessing Ty-3. Fla. 8923 is a large-fruited breeding line with a much reduced introgression that is free of the negative effects of linkage drag based on observations of several promising hybrids derived from it over three seasons and three locations (Hutton and Scott, unpublished data). It is potentially suitable as a parent in commercial hybrids or as a Ty-3 donor in tomato breeding programs where begomovirus resistant cultivars are the goal.
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Verlaan, M.G., Hutton, S.F., Ibrahem, R.M., Kormelink, R., Visser, R.G.F., Scott, J.W., Edwards, J.D. & Bai, Y. 2013 The tomato yellow leaf curl virus resistance genes Ty-1 and Ty-3 are allelic and code for DFDGD-class RNA-dependent RNA polymerases PLoS Genet. 9 3 e1003399