Journal of Tropical Oceanography ›› 2020, Vol. 39 ›› Issue (3): 76-85.doi: 10.11978/2020003CSTR: 32234.14.2020003

• Marine Biology • Previous Articles     Next Articles

Effect of manganese on the growth and chlorophyll fluorescence characteristics of benthic dinoflagellate Coolia tropicalis

Shasha LIU1,2, Heng CHEN1,2, Kaixuan HUANG1,2(), Songhui LÜ1,2, Liang ZHANG3, Xuedong XIE3   

  1. 1. Research Center for Harmful Algae and Marine Biology, Jinan University, Guangzhou 510362, China
    2. Key Laboratory of Aquatic Eutrophication and Control of Harmful Algae Blooms of Guangdong Higher Education Institutes, Guangzhou 510632, China
    3. Guangdong Environmental Monitoring Center, Guangzhou 510362, China
  • Received:2020-01-08 Revised:2020-01-29 Online:2020-05-10 Published:2020-05-19
  • Contact: Kaixuan HUANG E-mail:babyblue02@163.com
  • Supported by:
    Foundation item: National Natural Science Fund ation of China(41706126);National Natural Science Fund ation of China(41876173);Science & Technology Basic Resources Investigation Program of China(2018FY100200);Science & Technology Basic Resources Investigation Program of China(2018FY100100)

Abstract:

In this study, the effects of growth and chlorophyll fluorescence characteristics in Coolia tropicalis under different concentrations of manganese (Mn, 0, 1, 5, 10, and 50μmol·L -1) were investigated by using chlorophyll fluorescence kinetics technique. The results are as follows. The relationships of specific growth rate (μ) and maximal relative electron transport rate (rETRmax) with the concentration of Mn were fitted by exponential functions; growth and electron transport had the same degree of response to manganese stress. The regular activity of photosynthesis can be maintained only when the concentration of manganese is at least 1μmol·L -1. when the Mn concentration was lower than that 1μmol·L -1, the photochemical efficiency (Fv/Fm) begins to decrease after 6 days, while the per reaction center of absorbed light energy (ABS/RC) and heat energy dissipation (DI0/RC) increase, and no influence to electron transport (φE0) and the growth, which indicated Mn deficiency only decreased the number of active reaction center and increased the heat dissipation in this phase. While Mn deficiency extended to day 15, the rising of F0 and the decreases of φE0 and growth indicated that Mn deficiency caused irreversible damage to the active reaction center and inhibited the electron transport in this phase. The repair rate to damage rate (r/k) under intense light was not affected by Mn deficiency, indicated Mn deficiency did not influence the photoprotection of C. tropicalis.

Key words: manganese, Coolia tropicalis, benthic dinoflagellate, chlorophyll fluorescence, OJIP curve