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Journal of Tropical Oceanography

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Response of photosynthetic activity to temperature rise and light quality of four intertidal macroalgae from Lvhua Island, Zhejiang, China.

OU Jiaming1, WANG Shuhan1, ZHAO Xu1, 2, 3, 4, CHEN Jianqu1, SUN Jianing1, ZOU Qiao1, WANG Kaiyi1, ZHANG Shouyu1, 2, 3, 4, WANG Kai1, 2, 3, 4   

  1. 1 College of Oceanography and Ecological Science, Shanghai Ocean University, Shanghai 201306, China;

    2. Southern Marine Science and Engineering Guangdong Laboratory(Zhuhai), Zhuhai 519082, China;

    3. Engineering Technology Research Center of Marine Ranching, Shanghai Ocean University, Shanghai 201306, China;

    4. Marine Ranching Comprehensive Workstation of the East China Sea, Expert Advisory Committee of Marine Ranching Construction, Ministry of Agriculture and Rural Affairs, Shanghai 201306, China

  • Received:2024-08-15 Revised:2024-09-18 Accepted:2024-09-26
  • Contact: WANG, Kai
  • Supported by:

     Project supported by Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai) (SML2023SP237); National Natural Science Foundation of China (41876191); China Agriculture Research System (CARS-50)

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Abstract: In order to reveal the photosynthetic response of intertidal macroalgae to temperature rise and their photosynthetic efficiency under different light qualities, and to provide a theoretical basis for the construction of island seaweed farms and the cultivation of seaweed. We usd chlorophyll fluorescence and dissolved oxygen sensors to examine the photosynthetic responses of four macroalgae (Ulva pertusa, Grateloupia livida, Sargassum thunbergii and Sargassum fusiforme) from the intertidal zone of Lvhua Island to temperature (15, 20, 25℃, respectively) and light quality (white, red, green and blue). The results showed that temperature rise reduced the maximum quantum yield (Fv/Fm) of Photosystem II (PSII) in these seaweeds, but significantly enhanced the actual quantum yield (Y(Ⅱ)), ratio of photosynthetic repair to damage rate (r/k) and photochemical quenching (qP) under strong light (900μmol photons m-2·s-1). Temperature rise significantly increased the non-photochemical quenching (NPQ) of S. fusiforme, but the contrary was observed in G. livida. Compared to other seaweeds, S. thunbergii exhibits the highest maximum relative electron transfer rate (rETRmax), half-saturated light intensity (Ek), qP and r/k. Under different light qualities, these seaweeds show no significant differences in maximum photosynthetic rate (Pmax) under white, red and green light, but Pmax was significantly reduced under blue light, with the greatest decrease observed in U. pertusa. As a result, the photosynthetic responses of different species to temperature rise and light quality varied considerably, the short-term warming helps the four intertidal macroalgae to resist strong light and improve their photosynthetic activity under strong light at low tide. And S. thunbergii was more adapted to strong light and temperature rise than the others. Additionally, the higher photosynthetic efficiency under red and green light reflects their adaptation to the shallow water in the intertidal zone.

Key words: Macroalgae, intertidal zone, temperature rise, light quality, photosynthesis