title: Effects of environmental stresses on the responses of mangrove plants to spent lubricating oil.
abstract: The influence of different environmental stresses, including salinity (5-35‰), tidal cycle (6/6, 12/12 and 24/24 h of high/low tidal regimes) and nutrient addition (1-6 times background nitrogen and phosphorus content) on Bruguiera gymnorrhiza and Aegiceras corniculatum grown in sediment contaminated with spent lubricating oil (7.5 L m(-2)) were investigated. The oil-treated 1-year-old mangrove seedlings subject to low (5‰) and high (35‰) salinity had significantly more reduction in growth, more release of superoxide radical (O2·-) and higher activity of superoxide dismutase (SOD) than those subject to moderate salinity (15‰). Extended flooding (24/24 h of high/low tidal regime) enhanced O2·- release and malondialdehyde (MDA) content in both oil-treated species but had little negative effects on biomass production (P>0.05) except the stem of A. corniculatum (P=0.012). The addition of nutrients had no beneficial or even posed harmful effects on the growth and cellular responses of the oil-treated seedlings.
authors.affiliation: College of Environmental Science and Engineering, South China University of Technology, Guangzhou, Guangdong 510006, PR China.
authors.forename: Lin
authors.initials: L
authors.lastname: Ke
authors.forename: Chunguang
authors.initials: C
authors.lastname: Zhang
authors.forename: Chuling
authors.initials: C
authors.lastname: Guo
authors.forename: Guang Hui
authors.initials: GH
authors.lastname: Lin
authors.forename: Nora Fung Yee
authors.initials: NF
authors.lastname: Tam
mesh_terms: D001673:Biodegradation, Environmental; D019015:Geologic Sediments / Q000737:chemistry; D007219:Industrial Oils / Q000633:toxicity*; D007220:Industrial Waste / Q000009:adverse effects; D008315:Malondialdehyde / Q000378:metabolism; D029623:Primulaceae / Q000187:drug effects* / Q000378:metabolism; D043982:Rhizophoraceae / Q000187:drug effects* / Q000378:metabolism; D054712:Salinity; D012623:Seawater / Q000737:chemistry; D013312:Stress, Physiological; D013482:Superoxide Dismutase / Q000378:metabolism; D014872:Water Movements; D014874:Water Pollutants, Chemical / Q000633:toxicity*
chemical_list: D007220:Industrial Waste; D014874:Water Pollutants, Chemical; D008315:Malondialdehyde; D013482:Superoxide Dismutase