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Genetic and physical mapping of photoperiod insensitive gene Ppd-B1 in common wheat
Authors:Volker Mohler  Rudy Lukman  Sophia Ortiz-Islas  Manilal William  Anthony John Worland  Janny van Beem  Gerhard Wenzel
Institution:(1) Chair of Agronomy and Plant Breeding, Department of Plant Sciences, Centre for Life and Food Sciences Weihenstephan, Technical University Munich, Am Hochanger 2, 85350, Freising, Germany;(2) CIMMYT, Apdo. Postal, 6-641, 06600, Mexico, D.F., Mexico;(3) Department of Crop Genetics, John Innes Centre, Norwich Research Park, Colney, Norwich, NR4 7UH, U.K
Abstract:Photoperiod response is a major determinant of duration of growing stages in wheat. Conscious selection for these photoperiod response genes in plant breeding programs will yield genotypes with better adaptation to diverse environments. To provide a starting point for the development of molecular markers useful for the selection process, genetic maps around the photoperiod insensitive gene Ppd-B1 were built employing three segregating populations. Of 25 markers that were selected for the Ppd-B1 region, only two could be mapped across all three populations. In pairwise comparisons, the extent of transferable markers ranged from three to eight. Recombination frequencies of markers distal to Ppd-B1 were more homogeneous than those of proximal markers. This finding suggested a closer proximity of Ppd-B1 to the markers that were mapped distal to breakpoint 0.83 in the physical map of chromosome 2BS. This revised version was published online in August 2006 with corrections to the Cover Date.
Keywords:breakpoint interval mapping  genetic mapping  molecular markers  photoperiod response            Ppd-B1            wheat
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