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Simultaneous expression of Arabidopsis ρ-hydroxyphenylpyruvate dioxygenase and MPBQ methyltransferase in transgenic corn kernels triples the tocopherol content

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Abstract

The quantity and composition of tocopherols (compounds with vitamin E activity) vary widely among different plant species reflecting the expression, activity and substrate specificity of enzymes in the corresponding metabolic pathway. Two Arabidopsis cDNA clones corresponding to ρ-hydroxyphenylpyruvate dioxygenase (HPPD) and 2-methyl-6-phytylplastoquinol methyltransferase (MPBQ MT) were constitutively expressed in corn to further characterize the pathway and increase the kernel tocopherol content. Transgenic kernels contained up to 3 times as much γ-tocopherol as their wild type counterparts whereas other tocopherol isomers remained undetectable. Biofortification by metabolic engineering offers a sustainable alternative to vitamin E supplementation for the improvement of human health.

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Acknowledgments

This study was supported by the Ministerio de Ciencia e Innovación, Spain (BFU2007-61413); BIOFORCE ERC advanced grant to PC; S.N. and G.F. are recipients of Ph.D. fellowships from Ministerio de Ciencia e Innovación, Spain (BES-2005-9161).

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Correspondence to Paul Christou.

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Naqvi, S., Farré, G., Zhu, C. et al. Simultaneous expression of Arabidopsis ρ-hydroxyphenylpyruvate dioxygenase and MPBQ methyltransferase in transgenic corn kernels triples the tocopherol content. Transgenic Res 20, 177–181 (2011). https://doi.org/10.1007/s11248-010-9393-6

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  • DOI: https://doi.org/10.1007/s11248-010-9393-6

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