Photosynthetica 2020, 58(3):853-861 | DOI: 10.32615/ps.2020.035

Low pH in simulated acid rain promotes the toxicity of copper on the physiological performance in Sargassum horneri

Z.H. ZHONG1, S. QIN1, Y. WANG1,2, C. MA1,3, Z.Y. LIU1
1 Yantai Institute of Coastal Zone Research, Chinese Academy of Sciences, 264003 Yantai, China
2 Hohai University, Nanjing, 210098 Jiangsu, China
3 Shanxi Agricultural University, Jinzhong, 030801 Shanxi, China

In order to investigate the interactive effects of simulated acid rain and copper (Cu) on macroalgae, Sargassum horneri was cultured under pH of 8.2, 5.6, 4.5 and Cu concentrations of 0, 25, 100 μg L-1. Under the medium concentration of Cu, moderate pH mitigated the toxicity of Cu on S. horneri, while the low pH and high Cu concentration reduced the contents of chlorophyll (Chl) a and carotenoids. Furthermore, pH had no interaction with Cu on maximal Chl fluorescence or electron transport efficiency, while effective PSII quantum yield, maximum electron transport rate, and saturating irradiance were obviously affected by pH and Cu, and the interactive effects were significant. Additionally, with the increasing Cu concentration and decreasing pH, nonphotochemical quenching and regulated energy dissipation dropped sharply, while nonregulated energy dissipation increased. Therefore, the high concentration of Cu and low pH had synergistic effects on the photosynthetic performance and growth of S. horneri.

Additional key words: : environmental problem; metal pollution; photoprotective ability; photosynthetic apparatus; Sargassum beds.

Received: January 12, 2020; Revised: April 11, 2020; Accepted: April 14, 2020; Prepublished online: May 25, 2020; Published: June 11, 2020  Show citation

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ZHONG, Z.H., QIN, S., WANG, Y., MA, C., & LIU, Z.Y. (2020). Low pH in simulated acid rain promotes the toxicity of copper on the physiological performance in Sargassum horneri. Photosynthetica, 58(3), 853-861. doi: 10.32615/ps.2020.035
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