Qualitative and Quantitative Resistance against Early Blight Introgressed in Potato
Pieter J. Wolters | Doret Wouters | Emil J. Kromhout | Dirk Jan Huigen | Richard G. F. Visser | Vivianne G. A. A. Vleeshouwers
Early blight is a disease of potato that is caused by <i>Alternaria</i> species, notably <i>A. solani</i>. The disease is usually controlled with fungicides. However, <i>A. solani</i> is developing resistance against fungicides, and potato cultivars with genetic resistance to early blight are currently not available. Here, we identify two wild potato species, which are both crossable with cultivated potato (<i>Solanum tuberosum</i>)<i>,</i> that show promising resistance against early blight disease. The cross between resistant <i>S. berthaultii</i> and a susceptible diploid <i>S. tuberosum</i> gave rise to a population in which resistance was inherited quantitatively. <i>S. commersonii</i> subsp. <i>malmeanum</i> was also crossed with diploid <i>S. tuberosum</i>, despite a differing endosperm balance number. This cross resulted in triploid progeny in which resistance was inherited dominantly. This is somewhat surprising, as resistance against necrotrophic plant pathogens is usually a quantitative trait or inherited recessively according to the inverse-gene-for-gene model. Hybrids with high levels of resistance to early blight are present among progeny from <i>S. berthaultii</i> as well as <i>S. commersonii</i> subsp. <i>malmeanum</i>, which is an important step towards the development of a cultivar with natural resistance to early blight.
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