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Title: Quantitative Resistance to Bean dwarf mosaic virus in Common Bean is Associated with the Bct gene for Resistance to Beet curly top virus

Author
item Miklas, Phillip - Phil
item SEO, Y - UC DAVIS
item GILBERTSON, R - UC DAVIS

Submitted to: Plant Disease
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: 1/7/2009
Publication Date: 5/1/2009
Citation: Miklas, P.N., Seo, Y.S., Gilbertson, R.L. 2009. Quantitative Resistance to Bean dwarf mosaic virus in Common Bean is Associated with the Bct gene for Resistance to Beet curly top virus. Plant Disease. 93:645-648.

Interpretive Summary: Beet curly top virus is a major disease of common bean in the western U.S. Resistance genes in the host are used to control this pathogen, but the nature and inheritance of resistance is not fully understood. In addition there are few sources of resistance for breeders to use to develop resistant cultivars. This study identifies and characterizes inheritance of resistance to Beet curly top virus from a new source, the dry edible bean G122 which is from India. The resistance is conditioned by two genes, one with major effect and the other with minor effect. The results indicate that the major gene for resistance can be combined with other resistance genes or deployed alone to control this pathogen. Breeders now have a new source of resistance to work with in their breeding programs.

Technical Abstract: The dominant resistance gene, Bct, confers qualitative resistance to Beet curly top virus, a leafhopper-transmitted geminivirus in the genus Curtovirus. To determine whether this gene confers resistance to other geminiviruses, plants of a recombinant inbred population were sap-inoculated with BDMV, a whitefly-transmitted bipartite begomovirus in the genus Begomovirus. Results indicated that Bct is associated with quantitative resistance to BDMV; thus, the gene provides resistance to a bean-infecting begomovirus and curtovirus. The difference in the nature of the resistance to these geminiviruses may indicate a role for minor genes in begomovirus resistance or differences in the virus-host interaction. The Bct gene could be useful in the breeding of common bean varieties for broad-spectrum begomovirus resistance.