| Citation: |
YE Penghao, HAN Tingting, FU Guiquan, GU Yangguang, HUANG Honghui. Physiological response of Sargassum hemiphyllum to cadmium stress[J]. South China Fisheries Science, 2019, 15(5): 35-40. DOI: 10.12131/20190032
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Sargassum hemiphyllum, a common species in coastal waters of Guangdong Province, was selected to study its physiological response to different concentrations of heavy metal (Cd2+) stress and its tolerance to Cd2+ stress in laboratory semi-static experiments, so as to provide a basis for remediation of heavy metal pollution in that area. The results show that chlorophyll a (Chl a), carotenoid (Car), soluble protein (SP), soluble sugar (SS) and antioxidant enzyme activity (SOD and CAT) of S. hemiphyllum at Cd2+ concentration of 0.1 mg∙L−1
had no significant difference with the control (P>0.05). The contents of Chl a, Car, SP, SS, SOD and CAT at ρ(Cd2+) of 0.5−12.5 mg∙L−1, were significantly higher than those of the control (P<0.05); there was no significant change in MDA contents under Cd2+ concentration of 0.1−0.5 mg∙L−1 (P>0.05), and significant increase at Cd2+ concentration of 2.5−12.5 mg∙L−1 (P<0.05). Therefore, S. hemiphyllum had stronger stress resistance at Cd2+ concentration of ≤0.5 mg∙L−1, while excessive Cd2+ stress of >0.5 mg∙L−1 will be harmful for its photosynthesis and antioxidant function.
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