Submitted to: Molecular Breeding
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: 8/30/2012
Publication Date: 2/1/2013
Publication URL: http://handle.nal.usda.gov/10113/58208
Citation: Stewart, L.R., Haque, A.M., Jones, M.W., Redinbaugh, M.G. 2013. Response of maize (Zea mays L.) lines carrying Wsm1, Wsm2 and Wsm3 to the potyviruses Johnsongrass mosaic virus and Sorghum mosaic virus. Molecular Breeding. 31(2):289-297. Interpretive Summary: One of the most important viral diseases of corn in the world is Maize dwarf mosaic disease. The disease can be caused by any of a set of related viruses including Maize dwarf mosaic virus (MDMV), Sugarcane mosaic virus (SCMV), Johnsongrass mosaic virus (JGMV), and Sorghum mosaic virus (SrMV). Genetic resistance against the disease is the most effective control. Three genetic regions (loci), Wsm1, Wsm2, and Wsm3, from a resistant maize inbred, Pa405, have been discovered to that provide resistance to two Maize dwarf mosaic disease-causing viruses, MDMV and SCMV. In this study, we assessed whether these loci also confer resistance to JGMV and SrMV. Our results indicate that all three loci contribute partial resistance to JGMV and SrMV, with the Wsm1 locus providing the strongest resistance to both viruses.
Technical Abstract: Maize dwarf mosaic disease is one of the most important viral diseases of maize throughout the world. It is caused by a set of related viruses in the family Potyviridae, genus Potyvirus, including Maize dwarf mosaic virus (MDMV), Sugarcane mosaic virus (SCMV), Johnsongrass mosaic virus (JGMV), and Sorghum mosaic virus (SrMV). Resistance to another member of the family Potyviridae, Wheat streak mosaic virus (WSMV), is conferred by three loci (Wsm1, Wsm2, and Wsm3) from the maize inbred line Pa405. These loci confer resistance to the potyviruses MDMV and SCMV. In this study, we assessed whether Wsm loci also confer resistance to JGMV and SrMV. Our results indicate that Wsm1 provides resistance to both JGMV and SrMV in a dose-depended manner. Wsm2 and Wsm3 each provide limited resistance, and resistance is enhanced by combining the Wsm loci.