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Cucumber (Cucumis sativus) production in the eastern and midwestern United States is subject to severe losses due to fruit rot caused by the soilborne oomycete pathogen, Phytophthora capsici (Granke et al., 2012; Sonogo and Ji, 2012).P. capsici preferentially infects cucumber fruits, especially young fruit, while leaves and vines remain healthy (Ando et al., 2009, 2015; Gevens et al., 2006). Disease is manifested by extensive mycelial growth, sporulation, fruit rot, and tissue collapse. There are currently no commercial cucumber cultivars with resistance to this disease. Our prior screening of young fruit from 1076 accessions from the U.S. cucumber PI collection identified three PIs with potential resistance: PI 109483 and PI 178884 from Turkey and PI 214049 from India (Colle et al., 2014). Although each accession had multiple plants with mean fruit scores in the resistant category, there were mixtures of resistant and susceptible individuals within the PI seed sample. Heterogeneity and heterozygosity among samples have been frequently observed for PI accessions, including for disease resistance in cucurbits (e.g., Davis et al., 2007; Donahoo et al., 2013; Wechter et al., 2011), making it necessary to stabilize resistance before further breeding efforts. PI 214049 from India was consistently very late or failed to produce female flowers and fruits in the field inMichigan conditions and so was not pursued further. Of the two PIs from Turkey, progeny of PI 109483 appeared to have stronger and more consistent resistance in subsequent generations as expressed by either no lesion development or lesions largely limited to the site of inoculation. Here we report the development of a PI 109483derived S6 progeny line with young fruit resistant to infection by P. capsici as a possible source of resistance for use in breeding programs.

Cucumber (Cucumis sativus) Breeding Line with Young Fruit Resistance to Infection by Phytophthora capsici