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Joint effects of naphthalene and microcystin-LR on physiological responses and toxin bioaccumulation of Landoltia punctata.
- Source :
-
Aquatic toxicology (Amsterdam, Netherlands) [Aquat Toxicol] 2021 Feb; Vol. 231, pp. 105710. Date of Electronic Publication: 2020 Dec 04. - Publication Year :
- 2021
-
Abstract
- The co-contamination of naphthalene (NAP) and microcystin-LR (MC-LR) commonly occurs in eutrophic waters. However, the joint effects of NAP and MC-LR on plants in aquatic environments remain unknown. Landoltia punctata is characterized by high starch yields and high biomass in polluted waters and has been proven to be a bioenergy crop and phytoremediation plant. In this study, L. punctata was cultured in a nutrient medium with environmentally relevant NAP (0.1, 1, 3, 5, and 10 μg/L) and MC-LR (5, 10, 25, 50, and 100 μg/L) to determine individual and joint toxic effects. The effects of NAP and MC-LR on physiological responses of L. punctata, including growth, starch accumulation, and antioxidant responses, were studied. Bioaccumulation of MC-LR in L. punctata, with or without NAP, was also examined. The results showed that growth and chlorophyll-a contents of L. punctata were reduced at high concentrations of MC-LR (≥ 25 μg/L), NAP (≥ 10 μg/L) and their mixture (≥ 10 + 1 μg/L) after exposure for 7 d. Starch accumulation in L. punctata did not decrease when exposed to NAP and MC-LR, and higher starch content of 29.8 % ± 2.7 % DW could be due to the destruction of starch-degrading enzymes. The antioxidant responses of L. punctata were stronger after exposure to MC-LR + NAP than when exposed to a single pollutant, although not enough to avoid oxidative damage. NAP enhanced the bioaccumulation of MC-LR in L. punctata when NAP concentration was higher than 5 μg/L, suggesting that higher potentials of MC-LR phytoremediation with L. punctata may be observed in NAP and MC-LR co-concomitant waters. This study provides theoretical support for the application of duckweed in eutrophic waters containing organic chemical pollutants.<br /> (Copyright © 2020 Elsevier B.V. All rights reserved.)
- Subjects :
- Antioxidants metabolism
Araceae drug effects
Araceae growth & development
Bioaccumulation drug effects
Biodegradation, Environmental
Biomass
Models, Biological
Phenotype
Starch metabolism
Toxicity Tests
Water Pollutants, Chemical toxicity
Araceae physiology
Marine Toxins toxicity
Microcystins toxicity
Naphthalenes toxicity
Subjects
Details
- Language :
- English
- ISSN :
- 1879-1514
- Volume :
- 231
- Database :
- MEDLINE
- Journal :
- Aquatic toxicology (Amsterdam, Netherlands)
- Publication Type :
- Academic Journal
- Accession number :
- 33338701
- Full Text :
- https://doi.org/10.1016/j.aquatox.2020.105710