The Dicktoo x Morex doubled haploid barley mapping population

A number of years ago, when linkage maps and QTL were just a gleam in our collective eye, a population of 100 barley (Hordeum vulgare L.) doubled haploid (DH) lines was developed by the Oregon State University Barley Breeding Program for a NRI-funded collaborative program with Montana State University.

Morex, a midwestern six-row Manchurian-type, is the North American six-row malting quality standard. It was developed at the University of Minnesota from the cross of "Cree/"Bonanza" (Rasmusson and Wilcoxson, 1979).

Dicktoo is a six-row winter-feed barley released by Nebraska Agricultural Experimental Station in 1952. The pedigree of Dicktoo is unknown, and the variety description indicates the original release was a mixture. It included, among other phenotypes, blue and white aleurone. Dicktoo was chosen as a parent because it is a long-term check in the Uniform Barley Winterhardiness Nursery.

A population of 100 DH lines was developed from the F1 by the Hordeum bulbosum technique, as described by Chen and Hayes (1989).

Chen, F., and P.M. Hayes. 1989. A comparison of Hordeum bulbosum-mediated haploid production efficiency in barley using in vitro floret and tiller culture. Theor. Appl. Genet. 77:701-704.

Rasmusson, D.C., and R.D. Wilcoxson. 1979. Registration of Morex barley. Crop Sci 19:293.