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2-methyl-6-phytyl-1, 4-benzoquinol methyltransferase (MPBQ-MT) is a vital enzyme catalyzing a key methylation step in both α/γ-tocopherol and plastoquinone biosynthetic pathway. In this study, the gene encoding MPBQ-MT was isolated from lettuce ( Lactuca sativa ) by rapid amplification of cDNA ends (RACE), named  LsMT . Overexpression of  LsMT  in lettuce brought about a significant increase of α- and γ-tocopherol contents with a reduction of phylloquinone (vitamin K1) content, suggesting a competition for a common substrate phytyl diphosphate (PDP) between the two biosynthetic pathways. Besides, overexpression of  LsMT  significantly increased plastoquinone (PQ) level. The increase of tocopherol and plastoquinone levels by  LsMT  overexpression conduced to the improvement of plants’ tolerance and photosynthesis under high light stress, by directing excessive light energy toward photosynthetic production rather than toward generation of more photooxidative damage. These findings suggest that the role and function of  MPBQ-MT  can be further explored for enhancing vitamin E value, strengthening photosynthesis and phototolerance under high light in plants.

Roles of MPBQ-MT in Promoting α/γ-Tocopherol Production and Photosynthesis under High Light in Lettuce