Comparative mapping of the Oregon Wolfe Barley using doubled haploid lines derived from female and male gametes

The Oregon Wolfe Barley mapping population is a resource for genetics research and instruction. Prior reports are based on a population of doubled haploid (DH) lines developed by the Hordeum bulbosum (H.b.) method, which samples female gametes. We developed new DH lines from the same cross using anther culture (A.C.), which samples male gametes. Linkage maps were generated in each of the two subpopulations using the same 1,328 single nucleotide polymorphism markers. The linkage maps based on DH lines derived from the products of megasporogeneis and microsporogenesis revealed minor differences in terms of estimated recombination rates. There were no differences in locus ordering. There was greater segregation distortion in the A.C.-derived subpopulation than in the H.b.-derived subpopulation, but in the region showing the greatest distortion, the cause was more likely allelic variation at the ZEO1 plant height locus rather than to DH production method. The effects of segregation distortion and pleiotropy had greater impacts on estimates of quantitative trait locus effect than population size for reproductive fitness traits assayed under greenhouse conditions. The Oregon Wolfe Barley (OWB) population and data are community resources. Seed is available from three distribution centers located in North America, Europe, and Asia. Details on ordering seed sets, as well as complete genotype and phenotype data files, are available at http://wheat.pw.usda.gov/ggpages/maps/OWB/ .