Novel LMW glutenin subunit genes from wild emmer wheat (Triticum turgidum ssp. dicoccoides) in relation to Glu-3 evolution

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• 作者：Lumin Qin (1)
  Yu Liang (2)
  Daozheng Yang (1)
  Lei Sun (2)
  Guangmin Xia (1)
  Shuwei Liu (1)
  
• 关键词：LMW ; GS ; Chimeric gene ; Illegitimate recombination ; Unequal crossing over ; Triticum dicoccoides
• 刊名：Development Genes and Evolution
• 出版年：2015
• 出版时间：January 2015
• 年：2015
• 卷：225
• 期：1
• 页码：31-37
• 全文大小：1,286 KB
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• 作者单位：Lumin Qin (1)
  Yu Liang (2)
  Daozheng Yang (1)
  Lei Sun (2)
  Guangmin Xia (1)
  Shuwei Liu (1)
  
  1. The Key Laboratory of Plant Cell Engineering and Germplasm Innovation, Ministry of Education, School of Life Sciences, Shandong University, Jinan, 250100, People鈥檚 Republic of China
  2. Shandong Academy of Forestry, Jinan, 250014, People鈥檚 Republic of China
  
• 刊物类别：Biomedical and Life Sciences
• 刊物主题：Life Sciences
  Developmental Biology
  Neurosciences
  Cell Biology
  
• 出版者：Springer Berlin / Heidelberg
• ISSN：1432-041X

文摘

Four low-molecular-weight-isoleucine (LMW-i)-type and one novel chimeric (between LMW-i and LMW-methionine (m) types) low-molecular-weight glutenin subunit (LMW-GS) genes were characterized from wild emmer wheat (Triticum dicoccoides), designated as emmer-1 to emmer-5. All five LMW-GS genes possessed the same primary structure shared by other published LMW-GSs. The three genes emmer-1, emmer-3, and emmer-5 are similar, with the exception that emmer-3 and emmer-5 lost a few repeat motifs compared to emmer-1. Gene duplication and insertions/deletions of repeat motifs mediated through unequal crossing over may be responsible for the generation of these three Glu-3 alleles. Although the first residue of mature peptide of emmer-4 is isoleucine, it is not typical LMW-i-type LMW-GS. Phylogenetic analysis indicated that emmer-4 is located in the LMW-m subgroup, suggesting a closer relationship with LMW-m-type gene Y14104 of T. durum. Sequence alignment indicated that the emmer-4 is likely a chimeric gene generated by illegitimate recombination between LMW-i and LMW-m type. Unequal crossing over and illegitimate recombination are effective mechanisms for enriching both copy numbers and variations of LMW-GSs.