Early Toxic Effects of Cd2+ on Photosynthetic Activity of Six Freshwater Algae Species
Li-Li Dong 1  
,   Guo-Qing Zhang 1  
,   Wei Li 1  
,   Tao Ding 1  
,   Heng-Xing Wang 1  
,   Gen Zhang 2  
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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
Gen Zhang   

Shenzhen GenProMetab Biotechnology Company Limited, 518101, Shenzhen, 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
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.