Submitted to: Plant and Animal Genome VX Conference Abstracts
Publication Type: Abstract Only
Publication Acceptance Date: 2/7/2000
Publication Date: N/A
Technical Abstract: Resistance to numerous diseases pests in sugarbeet appear to be conferred by monogenes. These include resistance to powdery mildew, Erwinia vascular necrosis, beet mosaic virus, and Fusarium stalk rot. The inheritance of resistance to the cyst nematode, Heterodera schachtii, is monogenic and the inheritance of resistance to the root knot nematode is being evaluated. These pathosystems are being used as models for the generation of molecular genetic markers tagging genes for disease resistance in sugarbeet. Markers generated from the study will be used to evaluate the linkage and location in the sugarbeet genome of genes conferring resistance to several pathogens. In addition, the markers will be useful in the introgression of disease resistance genes into sugarbeet parent lines using marker-assisted selection and in future cloning and analysis of these genes. The use of resistance gene analog (RGA) sequences is being incorporated into the resistance gene detection strategies. Such sequences may permit the identification of quantitative trait loci that contribute to genetically-complex resistance in sugarbeet to rhizoctonia root rot, cercospora leaf spot, and aphanomyces black root diseases. The status of a project aimed at tagging a monogene conferring resistance to powdery mildew in sugarbeet caused by Erysiphe polygoni DC will be presented.