Submitted to: Potato Association of America Proceedings
Publication Type: Abstract Only
Publication Acceptance Date: May 6, 2011
Publication Date: February 1, 2012
Citation: Weber, B., Jansky, S.H., Halterman, D.A. 2012. Resistance to Early Blight in Hybrids Between a Solanum Tuberosum Haploid and S Raphanifolium [abstract]. Potato Association of America Proceedings. Paper. No. 60. Technical Abstract: Early blight of potato (Solanum tuberosum L.), caused by the foliar fungal pathogen Alternaria solani is a major cause of economic loss in many potato growing regions. Genetic resistance offers an opportunity to decrease fungicide usage while maintaining yield and quality. In this study, an early blight resistant clone of the diploid wild species S. raphanifolium (rap 119-2, PI 473369) was crossed as a male to the haploid US-W4 (2n=2x) of cultivated potato. Hybrids were backcrossed to both parents. Eight families were created and evaluated for early blight resistance in the field. Families created by backcrossing to the wild species parent were more resistant than those from backcrossing to the cultivated parent. Clones were identified with high levels of early blight resistance and adaptation to the photoperiod of a temperate production region. Male sterility, likely due to nuclear-cytoplasmic interactions, was observed in some US-W4 x rap 119-2 hybrids. Pollen-pistil incompatibility was also observed in some crosses involving the hybrids.