Molecular characterization of different Triticum monococcum ssp. monococcum Glu-A1^mx alleles

Li, H.Y. and Li, Z.L. and Zeng, X.X. and Zhao, L.B. and Chen, G. and Kou, C.L. and Ning, S.Z. and Yuan, Z.W. and Zheng, Y.L. and Liu, D.C. and Zhang, L.Q. (2016) Molecular characterization of different Triticum monococcum ssp. monococcum Glu-A1^mx alleles. Cereal Research Communications, 44 (3). pp. 444-452. ISSN 0133-3720

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Abstract

High-molecular-weight glutenin subunits (HMW-GSs) are important seed storage proteins associated with bread-making quality in common wheat (Triticum aestivum L., 2n = 6x = 42, AABBDD). Variation in the Glu-A1x locus in common wheat is scare. Diploid Triticum monococcum ssp. monococcum (2n = 2x = 14, A^mA^m) is the first cultivated wheat. In the present study, allelic variations at the Glu-A1^mx locus were systematically investigated in 197 T. monococcum ssp. monococcum accessions. Out of the 8 detected Glu-A1^mx alleles, 5 were novel, including Glu-A1^m-b, Glu-A1^m-c, Glu-A1^m-d, Glu-A1^m-g, and Glu-A1^m-h. This diversity is higher than that of common wheat. Compared with 1Ax1 and 1Ax2*, which are present in common wheat, these alleles contained three deletions/insertions as well as some single nucleotide polymorphism variations that might affect the elastic properties of wheat flour. New variations in T. monococcum probably occurred after the divergence between A and A^m and are excluded in common wheat populations. These allelic variations could be used as novel resources to further improve wheat quality.

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