Comparative mapping of genes for glume colouration and pubescence in hexaploid wheat (Triticum aestivum L.) |
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Authors: | E. K. Khlestkina T. A. Pshenichnikova M. S. Röder E. A. Salina V. S. Arbuzova A. Börner |
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Affiliation: | Institute of Cytology and Genetics, Siberian Branch of the Russian Academy of Sciences, Lavrentjeva 10, Novosibirsk 630090, Russia. khlest@bionet.nsc.ru |
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Abstract: | Microsatellite markers were used to map the major genes Bg (determining black glume colour), Rg1 and Rg3 (red glume), and a locus determining smokey-grey coloured glume to the distal ends of the short arms of the homoeologous group 1 chromosomes, proximally (or closely linked) to Xgwm1223 and distal to Xgwm0033. On this basis, we propose that these genes represent a set of homoeoloci, designated Rg-A1, Rg-B1, and Rg-D1. Rg3 and Bg appear to be variant alleles of Rg-A1. Both Rg3 and Bg are closely linked with the major glume pubescence gene Hg. Similarly, the hexaploid wheat smokey-grey glume gene and Rg2 represent alleles at Rg-D1. The microsatellite markers linked to the Rg genes were used to analyse a phenotypically and genotypically characterized set of Siberian spring wheats. A coincidence between the presence of the 264-bp allele of Xgwm0136 and Rg-A1b (Rg3) was observed; so Xgwm0136 can probably be used as a diagnostic marker for this gene. |
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