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Improving antioxidant activity in transgenic Codonopsis lanceolata plants via overexpression of the γ-tocopherol methyltransferase (γ-tmt) gene

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Abstract

Codonopsis lanceolata Trautv (Companulaceae) is a folk medicine in Korea. To shift the content of tocopherol and enhance its antioxidant properties, we overexpressed the γ-tocopherol methyltransferase (γ-tmt) gene in C. lanceolata. The antioxidant activity of methanolic crude extracts of the transgenic plants was compared to that of control plants using the 1,1-diphenyl-2-picrylhydrazyl radical scavenging method, with α-tocopherol and butylated hydroxy toluene as standard antioxidants. The antioxidant activity of the leaf and root extracts of transgenic plants was higher (IC 50 12–17.33 and 408–524 μg/ml, respectively) than that of control plant leaf and root extracts (18 and 529 μg/ml, respectively). High-performance liquid chromatography analysis of phenolic compounds confirmed an increase in the levels of 12 major phenolic acids and flavonoids in the leaf and root extracts of transgenic plants compared to control plants. We also found that the rate of photosynthesis was 48% higher in transgenic plants than in control plants. Based on these results, we suggest that increases in the α-tocopherol level in transgenic C. lanceolata plants may result in increases in the photosynthetic performance and antioxidant metabolism of these plants.

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Acknowledgments

This work was supported by the Konkuk University BrainPool for Dr. B. K. Ghimire.

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Authors and Affiliations

  1. Department of Applied Life Science, Konkuk University, Seoul, 143-701, South Korea

    Bimal Kumar Ghimire, Eun Young Kang, Joung Kuk Ahn & Ill Min Chung

  2. Bioherb Research Institute, Kangwon National University, Chunchon, 200-701, South Korea

    Eun Soo Seong, Eun Jung Goh & Chang Yeon Yu

Authors
  1. Bimal Kumar Ghimire
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  2. Eun Soo Seong
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  3. Eun Jung Goh
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  4. Eun Young Kang
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  5. Joung Kuk Ahn
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  6. Chang Yeon Yu
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  7. Ill Min Chung
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Corresponding author

Correspondence to Ill Min Chung.

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Bimal Kumar Ghimire and Eun Soo Seong contributed equally to this work.

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Ghimire, B.K., Seong, E.S., Goh, E.J. et al. Improving antioxidant activity in transgenic Codonopsis lanceolata plants via overexpression of the γ-tocopherol methyltransferase (γ-tmt) gene. Plant Growth Regul 63, 1–6 (2011). https://doi.org/10.1007/s10725-010-9488-3

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  • DOI: https://doi.org/10.1007/s10725-010-9488-3

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