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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 strains of Begomoviruses, those that cause Tomato yellow leaf curl virus (TYLCV) are among the most destructive, the most widespread, and the most well known. TYLCV-resistant cultivars are commercially available in many production regions, and most of these use the dominant Ty-1 gene. Generally, tomato growers do not like the TYLCV-resistant cultivars as well as susceptible cultivars due to linkage drag effects that reduce marketable yield, increase foliar disease infections to diseases such as early blight (Alternaria solani) and/or bacterial spot (Xanthomonas spp.). Furthermore, the Ty-1 gene is not effective against some TYLCV strains and some other Begomoviruses, such as Tomato mottle virus (ToMoV). To date, several additional resistance genes have been identified including Ty-2, Ty-3, Ty-4, ty-5, and recently Ty-6 (Hutton et al., 2012; Hutton and Scott, 2014). Whereas, the inheritance of these genes has generally been characterized in crosses with susceptible parents, epistatic relationships between resistance genes are not well understood. Combining resistance genes often provides higher levels and more broadly based resistance against various Begomoviruses (Mejia et al., 2010; Vidavski, 2007). For future breeding of cultivars with high levels of durable resistance, it will be beneficial for tomato breeders to use and/or combine multiple resistance genes. The present breeding line releases combine good horticultural and yield characteristics with Begomovirus resistance genes that have not yet been widely used commercially. These should prove useful either directly as parent lines in commercial hybrids or as sources of resistance for tomato breeders to develop their own parents for commercially acceptable hybrid cultivars.

Fla. 8638B and Fla. 8624 Tomato Breeding Lines with Begomovirus Resistance Genes ty-5 Plus Ty-6 and Ty-6, respectively