Changes in Activities of Antioxidative Enzymes and Pigment Contents in Leaves of Shade Orchids Adapting to High Sunlight Intensity

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  • ZHAO Xiheng
    <I>The United Graduate School of Agricultural Science, Gifu University</I>
  • LI Jincai
    <I>Faculty of Agriculture, Gifu University</I>
  • MATSUI Shuichiro
    <I>The United Graduate School of Agricultural Science, Gifu University</I> <I>Faculty of Agriculture, Gifu University</I>
  • OHNO Hajime
    <I>The United Graduate School of Agricultural Science, Gifu University</I> <I>Faculty of Agriculture, Shizuoka University</I>
  • MAEZAWA Shigenori
    <I>The United Graduate School of Agricultural Science, Gifu University</I> <I>Faculty of Agriculture, Gifu University</I>

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Other Title
  • 陰生ランにおける強光順応に伴う葉の抗酸化酵素活性と色素含量の変化
  • インセイ ラン ニ オケル キョウコウ ジュンノウ ニ トモナウ ハ ノ コウサンカ コウソ カッセイ ト シキソ ガンリョウ ノ ヘンカ

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Abstract

Antioxidative enzyme activities and contents of chlorophyll, carotenoid and flavonoid in leaves of Cattleya and Cymbidium exposed to 40%, 70% and full (100%) sunlight for 80 days from August 1 were examined. Results obtained were compared with our previous data for the same orchids exposed to different irradiance from May 1. Antioxidative mechanisms of these orchids attributed to adaptation to sunlight with high intensity would be dependent on the season before and during adaptation. The chlorophyll contents in both orchids decreased by light of high intensities in both seasons (August and May), though changes in carotenoid and flavonoid contents were different in plant species and depended on light intensity. High protein content, dry matter concentration of the leaves and percentage of flowering indicate a possible relation with antioxidative function, that is the function of protection against strong light-induced injuries.

Journal

  • Environment Control in Biology

    Environment Control in Biology 41 (3), 235-240, 2003

    Japanese Society of Agricultural, Biological and Environmental Engineers and Scientists

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