Antioxidative response of Kandelia obovata, a true mangrove species, to polybrominated diphenyl ethers (BDE-99 and BDE-209) during germination and early growth. Issue 2 (30th November 2017)

• Record Type: Journal Article
• Authors: Farzana, Shazia; Chen, Juan; Pan, Ying; Wong, Yuk-shan; Tam, Nora Fung Yee
• Is Part Of: Marine pollution bulletin. Volume 124:Issue 2(2017)
• Page Start: 1063
• Page End: 1070
• Publication Date: 2017-11-30
• Subjects: Polybrominated diphenyl ethers -- Germination -- Growth -- Antioxidative enzymes -- MDA; Marine pollution -- Periodicals; Marine Biology -- Periodicals; Water Pollution -- Periodicals; Mer -- Pollution -- Périodiques; Publications périodiques; Pollution des mers; Lutte antipollution; Electronic journals; 363.7394
• DOI: 10.1016/j.marpolbul.2016.12.041
• Languages: English
• ISSNs: 0025-326X

Abstract

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. Graphical abstract: Highlights: Germination of Kandelia obovata was not affected by PBDEs in contaminated sediment. BDE-99 contamination was more toxic than BDE-209 during germination. Both PBDEs increased production of reactive oxygen species in mangrove seedlings. POD activity was a good indicator for BDE-99 toxicity. CAT activity was an effective bio-indicator for BDE-209 contamination.