title: Antioxidative response of Kandelia obovata, a true mangrove species, to polybrominated diphenyl ethers (BDE-99 and BDE-209) during germination and early growth.
abstract: A 3-months microcosm experiment with mangrove sediment spiked with PBDEs and planted with propagules of Kandelia obovata was conducted to investigate PBDE toxicity and antioxidative responses of the germinated seedlings. BDE-99 suppressed germination rate, leaves formation and growth of mangrove seedlings. The leaves and roots of BDE-99 treated seedlings had significantly higher superoxide (O2-) release, malondialdehyde (MDA) and total polyphenol (TP) content, and peroxidase (POD) activity than the control. BDE-209 increased activities of all three antioxidative enzymes, catalase (CAT), POD and superoxide dismutase (SOD) in roots, but in leaves, only CAT activity was stimulated. The MDA content of BDE-209 treated seedlings was less than the control. PBDEs were found in plant tissues of the treated seedlings. These results indicated that even though PBDEs were taken up in tissues, K. obovata, due to its antioxidative defense enzymes, could tolerate PBDEs and could be used for the bioremediation of PBDE-contaminated environments.
authors.affiliation: Department of Biology and Chemistry, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong, China; State Key Laboratory in Marine Pollution, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong, China.
authors.forename: Shazia
authors.initials: S
authors.lastname: Farzana
authors.affiliation: Department of Biology and Chemistry, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong, China; Key Laboratory of Integrated Regulation and Resource Department on Shallow Lakes, Ministry of Education, College of Environment, Hohai University, Xikang Road, Nanjing 210098, China.
authors.forename: Juan
authors.initials: J
authors.lastname: Chen
authors.affiliation: Department of Biology and Chemistry, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong, China; State Key Laboratory in Marine Pollution, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong, China.
authors.forename: Ying
authors.initials: Y
authors.lastname: Pan
authors.affiliation: School of Science and Technology, Open University of Hong Kong, Homantin, Kowloon, Hong Kong, China.
authors.forename: Yuk-Shan
authors.initials: YS
authors.lastname: Wong
authors.affiliation: Department of Biology and Chemistry, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong, China; State Key Laboratory in Marine Pollution, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong, China. Electronic address: bhntam@cityu.edu.hk.
authors.forename: Nora Fung Yee
authors.initials: NFY
authors.lastname: Tam
mesh_terms: D000975:Antioxidants / Q000378:metabolism*; D002374:Catalase / Q000378:metabolism; D018525:Germination; D055768:Halogenated Diphenyl Ethers / Q000378:metabolism*; D008315:Malondialdehyde / Q000378:metabolism; D010084:Oxidation-Reduction; D018515:Plant Leaves / Q000378:metabolism; D018517:Plant Roots / Q000378:metabolism; D043982:Rhizophoraceae / Q000254:growth & development / Q000378:metabolism*; D036226:Seedlings / Q000378:metabolism; D013482:Superoxide Dismutase / Q000378:metabolism
chemical_list: C477694:2,2',4,4',5-brominated diphenyl ether; D000975:Antioxidants; D055768:Halogenated Diphenyl Ethers; D008315:Malondialdehyde; D002374:Catalase; D013482:Superoxide Dismutase; C010902:decabromobiphenyl ether
keywords: Antioxidative enzymes; Germination; Growth; MDA; Polybrominated diphenyl ethers