4.3 Article

Molecular characterisation of high molecular weight glutenin allele Glu-B1 h encoding 1Bx14+1By15 subunits in bread wheat (Triticum aestivum L.)

Journal

CROP & PASTURE SCIENCE
Volume 65, Issue 3, Pages 215-226

Publisher

CSIRO PUBLISHING
DOI: 10.1071/CP13409

Keywords

Glu-B1h, HMW-GS, molecular cloning, SNPs, wheat.

Funding

  1. National Natural Science Foundation of China [31271703, 31371621]
  2. China-Australia Cooperation Project from the Chinese Ministry of Science and Technology [2013DFG30530]
  3. National Key Project for Transgenic Crops in China [2011ZX08009-003-004]

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In this study, the authentic high molecular weight glutenin (HMW-GS) allele Glu-B1 h encoding for subunits 1Bx14 and 1By15 from German bread wheat cultivars Hanno and Imbros was identified and cross-verified by a suite of established protein analysis technologies, including sodium dodecyl sulfate-polyacrylamide gel electrophoresis, reversed-phase high-performance liquid chromatography, reversed-phase ultra-performance liquid chromatography, and matrix-assisted laser desorption/ionisation time-of-flight mass spectrometry (MALDI-TOF-MS). The complete encoding sequences were isolated by allele-specific PCR, and consist of 2367 bp for 1Bx14 and 2151 bp for 1By15 and encode 789 and 717 amino acid residues, respectively. The deduced molecular masses of two subunit genes were 82 340.13 Da and 74 736.13 Da, corresponding well to those determined by MALDI-TOF-MS. The presence and authenticity of 1Bx14 and 1By15 subunits were further confirmed by liquid chromatography coupled to tandem mass spectrometry and heterologous expression in E. coli. Comparative analysis demonstrated that 1Bx14 possessed one deletion and 20 single-nucleotide polymorphism variations compared with seven other Glu-B1 x-type HMW-GS genes that mainly resulted from C-T substitutions, whereas compared with five other Glu-B1 y-type HMW-GS genes, 1By15 displayed few variations. Phylogenetic analysis based on the complete coding sequences of the published HMW-GS genes showed that 1Bx14 had a high divergence with other 1Bx subunit genes, whereas 1By15 displayed greater similarity with 1By20. A possible evolutionary route for 1Bx14 gene formation is proposed, which might have resulted from an intra-strand illegitimate recombination event that occurred ~1.32 million years ago.

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