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Inhibitory effects of paraquat on photosynthesis and the response to oxidative stress in Chlorella vulgaris.
Ecotoxicology. 2009 Jul; 18(5):537-43.E

Abstract

This study investigated the effects of paraquat, a widely used herbicide, on the aquatic unicellular alga Chlorella vulgaris through short-term toxicity tests at the physiological and gene transcriptional levels. Exposure to 0.5 microM paraquat increased the activities of the antioxidant enzymes superoxide dismutase, peroxidase, and catalase to levels 4.93, 3.19, and 3.09 times higher, respectively, than those of the control. Furthermore, exposure to 0.75 microM paraquat increased the activities of these antioxidant enzymes to even higher levels. The decrease in chlorophyll content and the increases in reactive oxygen species (ROS) and malondialdehyde content following exposure to paraquat suggest that the alga was severely damaged and cell growth was greatly inhibited. Real-time PCR showed that paraquat reduced the transcript abundance of psaB and rbcL to 7.09 and 29.83% of the control, respectively. Our results demonstrate that paraquat inhibited electron transport and CO2 assimilation, and also triggered the synthesis of ROS that disrupt cellular structure and inhibit cell growth.

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Authors+Show Affiliations

Qian H
College of Biological and Environmental Engineering, Zhejiang University of Technology, 310032 Hangzhou, China.
Chen W
No affiliation info available
Sun L
No affiliation info available
Jin Y
No affiliation info available
Liu W
No affiliation info available
Fu Z
No affiliation info available

MeSH

Algal ProteinsAntioxidantsCarbon DioxideCell ProliferationChlorella vulgarisChlorophyllElectron TransportEnvironmental PollutantsHerbicidesMalondialdehydeOxidative StressParaquatPhotosynthesisReactive Oxygen SpeciesTranscription, Genetic

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

19377883

Citation

Qian, Haifeng, et al. "Inhibitory Effects of Paraquat On Photosynthesis and the Response to Oxidative Stress in Chlorella Vulgaris." Ecotoxicology (London, England), vol. 18, no. 5, 2009, pp. 537-43.
Qian H, Chen W, Sun L, et al. Inhibitory effects of paraquat on photosynthesis and the response to oxidative stress in Chlorella vulgaris. Ecotoxicology. 2009;18(5):537-43.
Qian, H., Chen, W., Sun, L., Jin, Y., Liu, W., & Fu, Z. (2009). Inhibitory effects of paraquat on photosynthesis and the response to oxidative stress in Chlorella vulgaris. Ecotoxicology (London, England), 18(5), 537-43. https://doi.org/10.1007/s10646-009-0311-8
Qian H, et al. Inhibitory Effects of Paraquat On Photosynthesis and the Response to Oxidative Stress in Chlorella Vulgaris. Ecotoxicology. 2009;18(5):537-43. PubMed PMID: 19377883.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Inhibitory effects of paraquat on photosynthesis and the response to oxidative stress in Chlorella vulgaris. AU - Qian,Haifeng, AU - Chen,Wei, AU - Sun,Liwei, AU - Jin,Yuanxiang, AU - Liu,Weiping, AU - Fu,Zhengwei, Y1 - 2009/04/18/ PY - 2009/01/06/received PY - 2009/04/06/accepted PY - 2009/4/21/entrez PY - 2009/4/21/pubmed PY - 2009/8/22/medline SP - 537 EP - 43 JF - Ecotoxicology (London, England) JO - Ecotoxicology VL - 18 IS - 5 N2 - This study investigated the effects of paraquat, a widely used herbicide, on the aquatic unicellular alga Chlorella vulgaris through short-term toxicity tests at the physiological and gene transcriptional levels. Exposure to 0.5 microM paraquat increased the activities of the antioxidant enzymes superoxide dismutase, peroxidase, and catalase to levels 4.93, 3.19, and 3.09 times higher, respectively, than those of the control. Furthermore, exposure to 0.75 microM paraquat increased the activities of these antioxidant enzymes to even higher levels. The decrease in chlorophyll content and the increases in reactive oxygen species (ROS) and malondialdehyde content following exposure to paraquat suggest that the alga was severely damaged and cell growth was greatly inhibited. Real-time PCR showed that paraquat reduced the transcript abundance of psaB and rbcL to 7.09 and 29.83% of the control, respectively. Our results demonstrate that paraquat inhibited electron transport and CO2 assimilation, and also triggered the synthesis of ROS that disrupt cellular structure and inhibit cell growth. SN - 1573-3017 UR - https://www.unboundmedicine.com/medline/citation/19377883/Inhibitory_effects_of_paraquat_on_photosynthesis_and_the_response_to_oxidative_stress_in_Chlorella_vulgaris_ L2 - https://doi.org/10.1007/s10646-009-0311-8 DB - PRIME DP - Unbound Medicine ER -