NDLI: Inhibitory effects of paraquat on photosynthesis and the response to oxidative stress in Chlorella vulgaris

Content Provider	Springer Nature Link
Author	Qian, Haifeng Chen, Wei Sun, Liwei Jin, Yuanxiang Liu, Weiping Fu, Zhengwei
Copyright Year	2009
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 μM 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 μM 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.
Starting Page	537
Ending Page	543
Page Count	7
File Format	PDF
ISSN	09639292
Journal	Ecotoxicology
Volume Number	18
Issue Number	5
e-ISSN	15733017
Language	English
Publisher	Springer US
Publisher Date	2009-04-18
Publisher Place	Boston
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Chlorella vulgaris Paraquat Real-time PCR Gene transcript Environmental Management Ecology Environment Ecotoxicology
Content Type	Text
Resource Type	Article
Subject	Health, Toxicology and Mutagenesis Medicine Toxicology Management, Monitoring, Policy and Law

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