Comparative Analysis of High-Molecular-Weight Glutenin Subunit Composition in Various Triticum Species |
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| Authors: | V Vallega |
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| Institution: | V. Vallega;, Istituto Sperimentale per la Cerealicoltura, Via Cassia 176, 1-00191 Rome (Italy) |
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| Abstract: | Variation in high-molecular-weight glutenin subunit composition amongst Triticum durum cvs. of different origins was investigated by SDS-PAGE and compared with that reported for T. dicoccum and T. aestivum. Tetraploid wheat collections (408 cvs.) were found to carry nearly twice as many Glu-A1 and Glu-B1 alleles as a hexaploid wheat sample of comparable size. In each of the taxa considered, allelic variation at the Glu-B1 locus was markedly greater than that observed for Glu-A1. However, because all the Glu-B1 subunits so far discovered exhibit a restricted and distinctive mobility range during. SDS-PAGE, it is suggested that they are derived from a single source, possibly from Aegilops searsii. Most durum cvs. carried a ‘null’Glu-A1 allele and therefore fewer subunits than dicoccums and common wheats. It is argued that differences in the frequency of occurrence of ‘null’Glu-1 alleles between taxa probably resulted from random samplings made by early agriculturalists and breeders, rather than from an inherent tendency of polyploid wheats to suppress the activity of “redundant” genes. |
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| Keywords: | Triticum durum Triticum dicoccum Triticum aestivum HMW glutenin subunits electrophoresis |
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