title: Growth and antioxidant response in Hydrocharis dubis (Bl.) Backer exposed to linear alkylbenzene sulfonate.
abstract: A two-week exposure experiment was designed to investigate the toxicity of linear alkylbenzene sulfonate (LAS) on the aquatic plant Hydrocharis dubis (Bl.) Backer, focusing on growth, photosynthetic pigments and the activities of antioxidant enzymes. No significant differences were observed in the growth parameters of H. dubis when H. dubis was exposed to lower LAS doses (<or=10 mg l(-1)). However, lower LAS doses remarkably promote the dry weight accumulation of H. dubis. Higher doses of LAS (>10 mg l(-1)) resulted in significant decreases in all growth parameters of H. dubis. No significant effect on pigment contents was observed at up to 50 mg l(-1) LAS, beyond which pigment contents declined gradually. Malondialdehyde (MDA) content did not show obvious differences when H. dubis plants were exposed to <or=50 mg l(-1) LAS. Peroxidase (POD), superoxide dismutase (SOD) and catalase (CAT) activities showed a concentration-dependent increase up to LAS concentrations of 0.1-10 mg l(-1), followed by a clear decrease. The results of this study suggest that LAS significantly inhibited the growth and physiology of H. dubis when the dose of LAS exceeded 10 mg l(-1) . Therefore, LAS at current environmental concentrations dose not appear to cause evident phytotoxic effects on H. dubis.
authors.affiliation: Laboratory of Aquatic Plants, College of Life Sciences, Wuhan University, 430072, Wuhan, People's Republic of China.
authors.forename: Zhonghua
authors.initials: Z
authors.lastname: Wu
authors.forename: Dan
authors.initials: D
authors.lastname: Yu
authors.forename: Jinlin
authors.initials: J
authors.lastname: Li
authors.forename: Gongguo
authors.initials: G
authors.lastname: Wu
authors.forename: Xiaona
authors.initials: X
authors.lastname: Niu
mesh_terms: D017738:Alkanesulfonic Acids / Q000633:toxicity*; D000975:Antioxidants / Q000378:metabolism*; D002374:Catalase / Q000378:metabolism; D004305:Dose-Response Relationship, Drug; D019684:Magnoliopsida / Q000187:drug effects* / Q000254:growth & development / Q000378:metabolism; D008315:Malondialdehyde / Q000378:metabolism; D009195:Peroxidase / Q000378:metabolism; D045322:Photosynthetic Reaction Center Complex Proteins / Q000378:metabolism; D013482:Superoxide Dismutase / Q000378:metabolism; D013997:Time Factors; D014874:Water Pollutants, Chemical / Q000633:toxicity*
chemical_list: D017738:Alkanesulfonic Acids; D000975:Antioxidants; D045322:Photosynthetic Reaction Center Complex Proteins; D014874:Water Pollutants, Chemical; C030641:alkylbenzyl sulfonic acid; D008315:Malondialdehyde; D002374:Catalase; D009195:Peroxidase; D013482:Superoxide Dismutase