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Overexpression of the Bx7 high molecular weight glutenin subunit on the Glu-B1 locus in a Korean wheat landrace

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Abstract

The Glu-B1al (Bx7OE + By8) allele is important for bread-making quality. The allele was found in a Korean wheat landrace using specific DNA markers. Molecular analyses were conducted to identify the overexpressed Bx7 (Bx7OE) subunit of the allele. The Korean wheat landrace (accession ID: IT166460) showed a similar protein expression level of Bx7 subunit, i.e., overexpression of Bx7 subunit towards cv. Glenlea, Canadian Western Red Spring wheat, which harbors Bx7OE subunit of Glu-B1al as detected on SDS–PAGE (sodium dodecyl sulfate poly-acrylamide gel electrophoresis). In addition, 2-DE (two-dimensional electrophoresis) analysis revealed similar protein expression patterns of the Bx7 subunit regions of IT166460 and Glenlea. The proportion of Bx7 to total HMW-GSs (high molecular weight glutenin subunits) in IT166460 (56.17 ± 0.22%) was higher than that of Chinese Spring (34.75 ± 1.03%) and even that of Glenlea (46.25 ± 1.76%) as assessed by RP-HPLC (reverse-phase high-performance liquid chromatography). Overexpression of Bx7 subunit was caused by gene duplication and indels of the promoter region of the Bx7 gene. IT166460 attained the 43 bp indel of the promoter region, as did Glenlea, i.e., the amplicon size of IT166460 was the same as that of Glenlea. In addition, the nucleotides present in the duplicated gene in IT166460 were the same as those in Glenlea. Bx7OE subunit is critical for dough strength. However, most wheat accessions harboring the subunit are distributed in America. Furthermore, most Korean wheats have little genetic variation in glutenin composition and are associated with inferior bread quality. Hence, IT166460 could be used to improve bread-making quality in the Korean wheat breeding program.

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Acknowledgements

This work was carried out with the support of the “Cooperative Research Program for Agriculture Science & Technology Development (RDA PJ01237601)” Rural Development Administration, Republic of Korea. The authors thank the National Agrobiodiversity Center for the germplasm used in this study.

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  1. Kun Cho and Chul Soo Park contributed equally as corresponding author to this work.

Authors and Affiliations

  1. Department of Crop Science and Biotechnology, Chonbuk National University, Jeonju, 54896, Korea

    Seong-Woo Cho & Chul Soo Park

  2. Department of Crop Science, Chungbuk National University, Cheongju, 28644, Korea

    Swapan Kumar Roy

  3. Crop Breeding Division, National Institute of Crop Science, Wanju-gun, 54955, Korea

    Jae-Buhm Chun

  4. Biomedical Omics Group, Korea Basic Science Institute, Cheongju, 28119, Korea

    Kun Cho

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  1. Seong-Woo Cho
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  2. Swapan Kumar Roy
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  3. Jae-Buhm Chun
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  4. Kun Cho
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  5. Chul Soo Park
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Correspondence to Kun Cho or Chul Soo Park.

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Cho, SW., Roy, S.K., Chun, JB. et al. Overexpression of the Bx7 high molecular weight glutenin subunit on the Glu-B1 locus in a Korean wheat landrace. Plant Biotechnol Rep 11, 97–105 (2017). https://doi.org/10.1007/s11816-017-0434-y

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