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United States Department of Agriculture

Agricultural Research Service

Research Project: SUNFLOWER GERMPLASM DIVERSIFICATION AND CHARACTERIZATION UTILIZING WILD SUNFLOWER SPECIES, CYTOGENETICS, AND APPLIED GENOMICS

Location: Sunflower Research

Title: Genetic mapping of HA-R4 identified the downy mildew resistance gene to races 300, 770, and 734

Authors
item Liu, Zhao -
item Gulya, Thomas
item Seiler, Gerald
item Vick, Brady
item Jan, Chao-Chien

Submitted to: Sunflower Research Forum
Publication Type: Other
Publication Acceptance Date: January 12, 2011
Publication Date: January 17, 2011
Citation: Liu, Z., Gulya, T.J., Seiler, G.J., Vick, B.A., Jan, C. 2011. Genetic mapping of HA-R4 identified the downy mildew resistance gene to races 300, 770, and 734. Sunflower Research Forum, January 12-13, 2011, Fargo, ND. Available: http://www.sunflowernsa.com/research/research-forum-presentations/2011/

Technical Abstract: The major genes for sunflower downy mildew resistance have been designated as Pl genes. Many Pl genes have been reported, with 10 of them having been mapped. In this study, we report the molecular mapping of the Pl gene in a downy mildew differential line HA-R4, which has been temporarily named PlHA-R4. It was mapped on the lower end of the linkage group (LG) 1 of the sunflower reference map, with 11 markers covering a genetic distance of 78.9 cM. One dominant marker ORS 1008 co-segregated with it, and another marker HT 636 was at a genetic distance of 0.3 cM proximal to this gene. Marker ORS 1008 was used to test 37 other germplasms. The data suggests that the Pl genes in HA-R4 and HA-R5 are different from other germplasms tested. The two tightly linked markers will be helpful for marker-assisted selection (MAS) in sunflower breeding, as well as molecular cloning of this gene.

Last Modified: 9/21/2014
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