Supplementary Ultraviolet Radiation B Together with Blue Light at Night Increased Quercetin Content and Flavonol Synthase Gene Expression in Leaf Lettuce (Lactuca sativa L.)

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  • EBISAWA Masanori
    Biotechnology Sector, Environmental Science Research Laboratory, Central Research Institute of Electric Power Industry Faculty of Life Sciences, Toyo University
  • SHOJI Kazuhiro
    Biotechnology Sector, Environmental Science Research Laboratory, Central Research Institute of Electric Power Industry Faculty of Horticulture, Chiba University
  • KATO Mieko
    Faculty of Life Sciences, Toyo University
  • SHIMOMURA Koichiro
    Faculty of Life Sciences, Toyo University
  • GOTO Fumiyuki
    Biotechnology Sector, Environmental Science Research Laboratory, Central Research Institute of Electric Power Industry
  • YOSHIHARA Toshihiro
    Biotechnology Sector, Environmental Science Research Laboratory, Central Research Institute of Electric Power Industry

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Other Title
  • Supplementary ultraviolet radiation B together with blue Llight at night increased quercetin content and flavonol synthase gene expression in leaf lettuce (Lactuca sativa L.).

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Abstract

Establishment of an effective supplementary lighting procedure is necessary to increase the value of leaf lettuce grown using a hydroponic method involving a low production cost. In leaf lettuce extracts, quercetin, one of the flavonoids, was isolated and identified. It was investigated that quercetin has important functions that can be used as a dietary supplement. Flavonol synthase (FLS) is a key enzyme involved in quercetin biosynthesis, catalyzes the conversion of dihydroquercetin to quercetin. Therefore, we determined the sequence of the flavonol synthase gene (FLS) in red leaf lettuce. We harvested leaf lettuce grown using supplementary light sources, such as ultraviolet radiation B (UV-B), ultraviolet radiation A, blue, and red lamps during the night. It is noteworthy that FLS expression and the quercetin content were particularly increased to a greater extent in young leaves than in mature leaves when UV-B and blue light were used simultaneously at night. We suggest that UV-B with blue light is used simultaneously at night for producing leaf lettuce with high quercetin content.

Journal

  • Environment Control in Biology

    Environment Control in Biology 46 (1), 1-11, 2008

    Japanese Society of Agricultural, Biological and Environmental Engineers and Scientists

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