Abstract
The proteins of Hordeum chilense grain were resolved into 25 major components by two-dimensional electrophoresis. Their solubilities in aqueous alcohol solutions were determined to distinguish prolamin storage proteins from metabolic and structural proteins. The prolamins were divided into two groups, based on the presence or absence of intermolecular disulfide bonds determined by gel-filtration chromatography. Using an incomplete set of Chinese Spring wheat-H. chilense disomic addition lines, the structural genes of 21 of the 26 most dominant seed proteins were assigned to chromosomes. The great majority of the prolamin genes, including those coding for a high molecular weight (HMW) prolamin subunit, was present on chromosome 1Hch. However, a small number of prolamin genes also occurred on chromosomes 5Hch and 7Hch. A minor protein, probably belonging to the nonstorage group of proteins, is coded by genes on 5Hch. Various ditelosomic addition lines and ditelosomic and disomic substitution lines for chromosome 7Hch were also analyzed by electrophoresis. This technique revealed that the genes for three major prolamins occur on the β arm of chromosome 7Hch and that a gene for a minor protein, also thought to be a prolamin, occurs on the α arm. These results are discussed in relation to the evolution of prolamin genes in the Triticeae.
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Payne, P.I., Holt, L.M., Reader, S.M. et al. Chromosomal location of genes coding for endosperm proteins of Hordeum chilense, determined by two-dimensional electrophoresis of wheat-H. chilense chromosome addition lines. Biochem Genet 25, 53–65 (1987). https://doi.org/10.1007/BF00498951
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DOI: https://doi.org/10.1007/BF00498951