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Title: Two Chromosome Segments Confer Multiple Potyvirus Resistance in Maize

Author
item LUBBERSTEDT, T - DANISH INST AG SCI
item INGVARDSEN, C - DANISH INST AG SCI
item MELCHINGER, A - UNIV HOHENHEIM
item XING, Y - DANISH INST AG SCI
item SALOMON, R - VOLCANI INST
item Redinbaugh, Margaret

Submitted to: Plant Breeding
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: 2/23/2006
Publication Date: 8/1/2006
Citation: Lubberstedt, T., Ingvardsen, C., Melchinger, A.E., Xing, Y., Salomon, R., Redinbaugh, M.G. 2006. Two Chromosome Segments Confer Multiple Potyvirus Resistance in Maize. Plant Breeding. 125(4):352-356

Interpretive Summary: Maize diseases incited by a group of related viruses called potyviruses are some of the most destuctive viruses in the crop world-wide. In this study, we showed that two defined segments of the maize genome from a European inbred line are sufficient to give resistance to six different potyviruses. This means that breeders could use marker assisted to develop inbred maize lines with a high degree of resistance to these damaging diseases. IMPACT STATEMENT: We demonstrated that specific maize genome segments from a European maize inbred are associated with a high degree of resistance to six different potyviruses that cause disease problems in maize world-wide. Since specific molecular markers have been associated with these genomic segments, corn breeders can use marker-assisted selection to develop potyvirus-resistant, agronomically desirable hybrid corn. Because the markers associated with multiple virus resistance, scientists will use the information to develop new knowledge about the evolution of disease resistance in maize and to identify strategies for breeding maize with resistance to other virus diseases.

Technical Abstract: Introgression of both the Scmv1 and the Scmv2 regions from the resistant donor line FAP1360A was sufficient for complete sugarcane mosaic virus resistance of the otherwise susceptible inbred F7, as expected from preceding mapping studies). In addition, the converted inbred F7 confered resistance to multiple potyviruses, including maize dwarf mosaic virus, johnsongrass mosaic virus, wheat streak mosaic virus, sorghum mosaic virus and zea mosaic virus. It could not be determined whether these genomic regions also conferred resistance to high plains virus, because the F7 inbred showed significant resistance to the virus. These data indicate that multiple potyvirus resistance can be achieved using marker-assisted selection for both genome regions and provide a promising option to convert susceptible maize inbreds to lines with multiple potyvirus resistance.