Early Toxic Effects of Cd2+ on Photosynthetic Activity of Six Freshwater Algae Species
Wei Li 1
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College of Life and Environmental Sciences, Huangshan University, Huangshan City, Anhui Province, P. R. China
Shenzhen GenProMetab Biotechnology Company Limited, Shenzhen City, Guangdong Province, P. R. China
Submission date: 2019-03-02
Final revision date: 2019-07-06
Acceptance date: 2019-07-07
Online publication date: 2020-01-23
Publication date: 2020-03-31
Corresponding author
Gen Zhang   

Shenzhen GenProMetab Biotechnology Company Limited, 518101, Shenzhen, China
Pol. J. Environ. Stud. 2020;29(3):2159-2166
Cd2+ is a serious environmental pollutant. Previous studies have investigated the effects of Cd2+ on animals, plants and algae. However, the tested concentrations were generally higher than the actual environment level. The present study determined the effects of low concentrations of Cd2+ (0.05 to 0.20 mg/L) on the chlorophyll fluorescent parameters of six local algae species in order to investigate the early toxicity of Cd2+. The results showed that treatments with up to 0.20 mg/L Cd2+ did not significantly affect population growth rate of S. quadricauda, C. pyrenoidosa, S. obliquus, N. palea, S. minutum and S. acutus. Treatments with 0.05-0.20 mg/L Cd2+ significantly increased Fv/Fm in N. palea and S. minutum and decreased Fv/Fm in S. obliquus and S. acutus, but did not significantly affect Fv/Fm in C. pyrenoidosa. When exposed to Cd2+, rETRmax was reduced in S. obliquus, C. pyrenoidosa, S. acutus and S. quadricauda, but was elevated in N. palea and S. minutum. Overall, trace Cd2+ still revealed early toxicity to green algae. N. palea, S. minutum and C. pyrenoidosa were more tolerant to Cd2+ than S. obliquus, S. acutus and S. quadricauda.
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