Diurnal change of the photochemical efficiency in a seagrass, <i>Enhalus acoroides</i>, based on the measurement under incident sunlight

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  • Shimada Natsumi
    United Graduate School of Agricultural Sciences, Kagoshima University
  • Gregory N. Nishihara
    Institute for East China Sea Research, Organization for Marine Science and Technology, Nagasaki University
  • Terada Ryuta
    United Graduate School of Agricultural Sciences, Kagoshima University

Bibliographic Information

Other Title
  • 自然光下の測定によるウミショウブの光合成光化学効率の日変化
  • シゼンコウ カ ノ ソクテイ ニ ヨル ウミショウブ ノ コウゴウセイ コウカガク コウリツ ノ ニチヘンカ

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Description

<p>The diurnal change in photochemical efficiency of a seagrass, Enhalus acoroides was determined in Okinawa, Japan. The measurements under incident sunlight were conducted from sunrise through sunset using a submersible pulse amplitude modulation (PAM)-chlorophyll fluorometer (Diving-PAM). The effective quantum yield (ΔF/Fm’) declined with increasing incident sunlight in the morning, with a ΔF/Fm’ minima occurring during noon-time. Thereafter, the ΔF/Fm’ gradually recovered during the afternoon incident sunlight decreased, indicating a dynamic negative response to the excess sunlight. The decline of ΔF/Fm’ in the habitat is likely a photoprotective response to protect the photosynthetic reaction center from damage by excess light energy.</p>

Journal

  • Aquaculture Science

    Aquaculture Science 70 (3), 277-280, 2022

    Japanese Society for Aquaculture Science

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