The effect of temperature and light on the photosynthesis of annual <i>Zostera marina</i> seedlings from Kagoshima, Japan

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  • SHIMADA NATSUMI
    United Graduate School of Agricultural Sciences, Kagoshima University
  • TATAMIDANI IORI
    Faculty of Fisheries, Kagoshima University
  • N. NISHIHARA GREGORY
    Institute for East China Sea Research, Organization for Marine Science and Technology, Nagasaki University
  • TERADA RYUTA
    United Graduate School of Agricultural Sciences, Kagoshima University

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  • 鹿児島産一年生アマモ<i>Zostera marina</i>実生の光合成に対する温度や光の影響

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<p>　The effect of temperature and light on the photosynthesis of seedlings of Zostera marina from the annual population in Kagoshima, Japan was determined by field and laboratory measurements using a pulse amplitude modulation (PAM)-chlorophyll fluorometer. The response of oxygenic photosynthesis to temperature (8-40℃) was also examined with dissolved oxygen sensors to compare with effective quantum yields (ΔF/Fm′) of photosystem II. The temperature response of ΔF/Fm′ under 50 μmol photons m−2 s−1 (12L12D photoperiod) and during five days of cultivation revealed that ΔF/Fm′ gradually increased to the optimal temperature at 23.1℃ (ToptΔF/Fm′; 19.0-27.4℃), then quickly declined at higher temperatures. The 12-hour chronic combined effects of temperature and light at 8 and 20℃, under 200 and 1,000 μmol photons m−2 s−1 showed that the depression of ΔF/Fm′ was more pronounced under the low temperature with high light, indicating the occurrence of chronic low temperature-light stress. The temperature response of the oxygenic gross-photosynthesis curve indicated an optimal temperature at 31.0℃ (ToptGP; 28.4-33.2℃), then declined at higher temperatures. The underwater measurements of natural communities of Z. marina in Kagoshima showed that ΔF/Fm′ declined with increasing incident light, with a minimum occurring during noon to early afternoon. Nevertheless, ΔF/Fm′ recovered by sunset.</p>

Journal

  • NIPPON SUISAN GAKKAISHI

    NIPPON SUISAN GAKKAISHI 88 (6), 472-484, 2022-11-15

    The Japanese Society of Fisheries Science

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