The effect of temperature and irradiance on the photosynthesis of a seagrass, <i>Halodule uninervis</i>, from Amami-Oshima Island, Kagoshima

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

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Other Title
  • 奄美大島産ウミジグサ<i>Halodule uninervis</i>の光合成における温度や光の影響

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<p>　The effect of temperature and irradiance on the photosynthesis of a tropical seagrass, Halodule uninervis, from Amami-Oshima Island, Kagoshima, Japan, close to the northern distributional limit in the western Pacific, was determined using a pulse amplitude modulation (PAM)-chlorophyll fluorometer and dissolved oxygen sensors. The response of oxygenic photosynthesis to irradiance (0–1000 µmol photons m－2 s－1) at 15 and 24℃ revealed that the maximum net photosynthesis (NPmax) was 14.7 and 51.9 µg O2 gww－1 min－1, respectively. The temperature response of gross photosynthesis (8–40℃) showed that the highest gross photosynthetic rate occurred at 30.5℃ (ToptGP). In contrast, the temperature response of the maximum quantum yield (Fv/Fm) of photosystem II after 3 days of cultivation in darkness revealed that Fv/Fm gradually increased to the optimal temperature (ToptFv/Fm) of 23.9℃, then gradually declined at higher temperatures. The combined effects of 12-hour chronic exposure to temperature and irradiance at 15 and 24℃, under 300 and 1000 µmol photons m－2 s－1 showed that the depression of Fv/Fm was more pronounced under low temperature with high irradiance, indicating the occurrence of chronic low temperature-light stress.</p>

Journal

  • NIPPON SUISAN GAKKAISHI

    NIPPON SUISAN GAKKAISHI 89 (2), 115-126, 2023-03-15

    The Japanese Society of Fisheries Science

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