Link to home

Foliar resistance to bacteria in potato

Dennis Halterman: USDA ARS

<div>Solanaceous crops including tomato, pepper, and eggplant are susceptible to many foliar bacterial pathogens. However, cultivated potato is immune to most pathogenic <i>Pseudomonas</i> and <i>Xanthomonas</i> species. The purpose of this project is to understand the mechanisms involved in limiting infection of bacteria in the foliage of potato. We have previously found that many popular potato cultivars are immune <i>P. syringae </i>pv. <i>tomato</i> DC3000, while many wild species accessions of potato are susceptible or tolerant, suggesting that resistance to foliar pathogens may have been selected during cultivation of potato as a food crop. We have used various DC300 strains defective in pathogenesis (∆hrcC, ∆fliC, -coronatine). Populations between wild and cultivated potato have also been developed to map the resistance locus using SNP genotyping. The identification of novel genes involved in bacterial resistance will facilitate the development of new varieties of Solanaceous crops.</div>