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Genetics, Vol 134, 1231-1236, Copyright © 1993
INVESTIGATIONS |
Fine Physical Mapping of Ph1, a Chromosome Pairing Regulator Gene in Polyploid Wheat
K. S. Gill, B. S. Gill, T. R. Endo and Y. Mukai
Wheat Genetics Resource Center, Department of Plant Pathology, Kansas State University, Manhattan, Kansas 66506-5502
The diploid-like chromosome pairing in polyploid wheat is controlled by the Ph1 (pairing homoeologous) gene that is located on chromosome arm 5BL. By using a combination of cytogenetic and molecular techniques, we report the physical location of the Ph1 gene to a submicroscopic chromosome region (Ph1 gene region) that is flanked by the breakpoints of two deletions (5BL-1 and ph1c) and is marked by a DNA probe (XksuS1). The Ph1 gene region is present distal to the breakpoint of deletion 5BL-1 but proximal to the C-band 5BL2.1. Two other DNA probes (Xpsr128 and Xksu75) flank the region-Xpsr128 being proximal and Xksu75 being distal. The estimated size of the region is less than 3 Mb. The chromosome region around the Ph1 gene is high in recombination as the genetic distance of the region between 5BL-1 breakpoint and C-band 5BL2.1 (not resolved by the microscope) is at least 9.3 cM.
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