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Asian Journal of Biochemistry
Year: 2011  |  Volume: 6  |  Issue: 4  |  Page No.: 322 - 336

Molecular Classification of Members in LMW Glutenin Family of Wild Emmer Wheat (Triticum dicoccoides, AABB)

Li-Juan Yang, Ya-Xi Liu, Bi-Ling Xu, Wei Li and Guo-Yue Chen    

Abstract: One hundred and thirteen low-molecular-weight glutenin subunits encoding sequences and parts of upstream were characterized from Triticum dicoccoides. The encoded proteins of 113 genes had similar structures to previously characterized LMW-GS. These sequences had 856~1402 nucleotides in length with 2~26 repeat motifs. Most of the sequences were typical LMW-m glutenin subunits genes and the frequency of SNPs was 1.6 out of 10 bases and A-G mutation was the most frequent. Fourteen deduced amino acid sequences were found to be possessed with an additional cysteine residue in C-ter I. Thirty-six haplotypes were detected and phylogenetic analysis indicated that the 36 haplotypes could be classified into 3 haplotype groups. Individually classifications based on the four main domains of LMW-GS DNA sequences, 5’flanking, single peptide, N-terminals and C-terminal, were in agreement with the classification based on the coding regions. Consilient evolution was found between domains of LMW-GS as well as each domain and the whole coding region. The results revealed the important information of low-molecular-weight glutenin subunit gene family and contributed to our understanding of functional aspects of the low-molecular-weight glutenin subunit genes.

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