Genetic analysis of gliadin-encoding genes reveals gene clusters as well as single remote genes |
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Authors: | E V Metakovsky M G Akhmedov A A Sozinov |
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Institution: | (1) Institute of General Genetics USSR Academy of Sciences, Gubkin St., 3, 117809 GSP-1, B-333 Moscow, USSR |
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Abstract: | Summary Analysis of F2 grains from two different crosses has revealed a complex organization of the family of gliadin-coding genes located on chromosomes of the first homoeological group in hexaploid wheat. Chromosome 1A of variety Bezenchukskaya 98 was found to carry at least five gliadin-coding genes of which three genes form a cluster controlling the synthesis of the GLD1A1 block. Two additional genes are located on the both sides of this cluster and recombine with it at frequencies of 5±1.3% and 13±2.9%. Gliadinencoding genes recombining with the main clusters were also found on chromosomes 1B and 1A in the Bezenchukskaya 98 and Saratovskaya 210 varieties, respectively. In Chinese Spring , widely used in genetic studies, we discovered a recombination between genes located on chromosome 1A and controlling the synthesis of - and -gliadins. Varieties and biotypes of one variety may differ by the presence or absence of such selfish (not included in clusters) gliadin components. The similarity of organization of prolamine-coding genes on chromosomes in different cereals is considered. |
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Keywords: | Genetics Gliadins Gene clusters Recombination |
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