Journal of Tropical Oceanography ›› 2025, Vol. 44 ›› Issue (3): 72-84.doi: 10.11978/2024157CSTR: 32234.14.2024157

• Marine Biology • Previous Articles     Next Articles

Response of photosynthetic activity to temperature rise and light quality of four intertidal macroalgae from Lühua 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 Online:2025-05-10 Published:2025-06-04
  • Contact: WANG Kai
  • Supported by:
    Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai)(SML2023SP237); National Natural Science Foundation of China(41876191); China Agriculture Research System(CARS-50)

Abstract:

In order to reveal the photosynthetic response of intertidal macroalgae to temperature rise and their photosynthetic efficiency under different light qualities and provide a theoretical basis for the construction of island seaweed farms and the cultivation of seaweed, we used 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 Lühua Island to temperatures (15℃, 20℃, and 25℃) 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), but significantly enhanced the actual quantum yield [Y(Ⅱ)], the ratio of photosynthetic repair to damage rate (r/k) and photochemical quenching (qP) under high light intensity (900 μmol photons·m-2·s-1) in these seaweeds. Temperature rise significantly increased the non-photochemical quenching (NPQ) of S. fusiforme, but significantly decreased that of G. livida. Compared to other seaweeds, S. thunbergii exhibited the highest maximum relative electron transfer rate (rETRmax), half-saturated light intensity (Ek), qP and r/k. Under white, red and green light, these seaweeds showed no significant differences in maximum photosynthetic rate (Pmax), but their Pmax was significantly reduced under blue light, with the greatest decrease observed in U. pertusa. As shown in our study, the photosynthetic responses of different species to temperature rise and light quality varied considerably, and short-term warming helps the four intertidal macroalgae to resist strong light at low tide and improve their photosynthetic activity under strong light. Notably, S. thunbergii showed higher photosynthetic activity and better adaptation to strong light and temperature rise than the other three. Additionally, the high photosynthetic efficiency under red and green light reflects their good adaptation to the shallow-water environment in the intertidal zone.

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

CLC Number: 

  • Q945.11