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Ecophysiological differences between five mangrove seedlings under heavy metal stress
Yue-Yue Zhou1, You-Shao Wang2, Aniefiok Ini Inyang1
1State Key Laboratory of Tropical Oceanography, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301, China; Daya Bay Marine Biology Research Station, Chinese Academy of Sciences, Shenzhen 518121, China; Innovation Academy of South China Sea Ecology and Environmental Engineering, Chinese Academy of Sciences, Guangzhou 510301, China; University of Chinese Academy of Sciences, Beijing 100049, China.
Abstract:
It was studied for the effects of heavy metal stress on the antioxidant activities of superoxide dismutase (SOD), peroxidase (POD), catalase (CAT) and lipid peroxidation (MDA) in the leaves of five mangrove plants. The results showed the protein concentrations were significantly higher in B. gymnorrhiza (7.55 mg prot /mL: Cu2+), K. obovata (11.21 mg prot/mL: Cd2+) and R. stylosa (12.51 mg prot/mL: Cd2+) (p < 0.05). Comparably, MDA contents were remarkably high in A. marina than other species under the same conditions (p < 0.05). The SOD, POD and CAT were observed to be significantly high in A. marina, A. corniculatum and B. gymnorrhiza under the same heavy metal treatment (p < 0.05). The PCA revealed that POD, SOD and MDA of five mangrove species were the major indices for response to heavy metal. And A. marina was more tolerant to heavy metal stress than others.
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