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Theoretical And Applied Genetics 1985-Sep

Structural homology of endosperm high molecular weight glutenin subunits of common wheat (Triticum aestivum L.).

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Prijava / prijava
Povezava se shrani v odložišče
G Galili
M Feldman

Ključne besede

Povzetek

Several high molecular weight endosperm glutenin subunits, coded by genes located on chromosomes 1A, 1B and 1D of common wheat, Triticum aestivum L. em. Thell., were isolated from excised gel segments and subjected to amino acid analysis and peptide mapping; the latter was carried out following a limited digestion with trypsin, chymotrypsin or Staphylococcus aureus - V8 protease. Generally, all high molecular weight glutenins had a similar amino acid composition but several significant differences were observed in some of them. Both analyses revealed that the structural similarity among the various subunits was related to the homology of the genes coding them: subunits coded by homoalleles, i.e., different alleles of the same gene, were most similar; those coded by homoeoalleles, i.e., alleles of homoeologous genes, were less similar; whereas subunits coded either by alleles of different genes of the same gene cluster, or by nonhomoeoalleles of homoeologous clusters, were the least similar. Several small peptides derived from protease digestion of various subunits had a higher than expected staining intensity indicating that small peptide repeats may be interspersed within the glutenin subunits. The evolutionary course of the high molecular weight glutenins is discussed.

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