Polymorphism of high molecular weight glutenin subunits in three species of Aegilops |
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Authors: | M. Rodríguez-Quijano M.T. Nieto-Taladriz J.M. Carrillo |
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Affiliation: | (1) Unidad de Genética, E.T.S.I. Agrónomos Universidad Politécnica, 28040 Madrid, Spain;(2) U .S . Department of Agriculture, Agricultural Research Service, 53706 Madison, USA |
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Abstract: | A collection of 136 accessions of Aegilops umbellulata (39), Ae. comosa (75) and Ae. markgrafii (22) was analysed for high-molecular-weight (HMW) glutenin subunits composition. The homogeneity of the accessions was studied and 55.1% of the collection was homogeneous for HMW glutenin subunits (29 Ae. umbellulata, 33 Ae. comosa and 14 Ae. markgrafii). The HMW glutenin subunits of Ae. umbellulata are encoded by the Glu-U1 locus; in Ae. comosa results showed that this proteins are encoded at the 1M chromosome, and the locus was named Glu-M1. In Ae. markgrafii it was assumed that HMW glutenin subunits were encoded by an homoeologous locus and it was named Glu-C1. All the accessions of Ae. umbellulata and Ae. markgrafii expressed both, x-type and y-type subunits. Among the Ae. comosa accessions, only one expressed an x-type subunit alone. All the accessions of Ae. umbellulata and some of Ae. comosa had x-type glutenins of higher molecular weights than those commonly present in bread wheat. A total of 8 alleles were detected at the Glu-U1 locus, 11 at the Glu-M1 and 4 at the Glu-C1. The new HMW glutenin variation found in this work suggests their possible utilisation in breeding for wheat quality. |
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Keywords: | Aegilops comosa Ae. markgrafii Ae. umbellulata HMW glutenin subunits Polymorphism |
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