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

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 superox... Full description

Journal Title: Ecotoxicology 2009, Vol.18(5), pp.537-543
Main Author: Qian, Haifeng
Other Authors: Chen, Wei , Sun, Liwei , Jin, Yuanxiang , Liu, Weiping , Fu, Zhengwei
Format: Electronic Article Electronic Article
Language: English
Subjects:
ID: ISSN: 0963-9292 ; E-ISSN: 1573-3017 ; DOI: 10.1007/s10646-009-0311-8
Link: http://dx.doi.org/10.1007/s10646-009-0311-8
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recordid: springer_jour10.1007/s10646-009-0311-8
title: Inhibitory effects of paraquat on photosynthesis and the response to oxidative stress in Chlorella vulgaris
format: Article
creator:
  • Qian, Haifeng
  • Chen, Wei
  • Sun, Liwei
  • Jin, Yuanxiang
  • Liu, Weiping
  • Fu, Zhengwei
subjects:
  • Chlorella vulgaris
  • Paraquat
  • Real-time PCR
  • Gene transcript
ispartof: Ecotoxicology, 2009, Vol.18(5), pp.537-543
description: 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 psa B and rbc L to 7.09 and 29.83% of the control, respectively. Our results demonstrate that paraquat inhibited electron transport and CO 2 assimilation, and also triggered the synthesis of ROS that disrupt cellular structure and inhibit cell growth.
language: eng
source:
identifier: ISSN: 0963-9292 ; E-ISSN: 1573-3017 ; DOI: 10.1007/s10646-009-0311-8
fulltext: fulltext
issn:
  • 1573-3017
  • 15733017
  • 0963-9292
  • 09639292
url: Link


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titleInhibitory effects of paraquat on photosynthesis and the response to oxidative stress in Chlorella vulgaris
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subjectChlorella vulgaris ; Paraquat ; Real-time PCR ; Gene transcript
descriptionThis 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 psa B and rbc L to 7.09 and 29.83% of the control, respectively. Our results demonstrate that paraquat inhibited electron transport and CO 2 assimilation, and also triggered the synthesis of ROS that disrupt cellular structure and inhibit cell growth.
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descriptionThis 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 psa B and rbc L to 7.09 and 29.83% of the control, respectively. Our results demonstrate that paraquat inhibited electron transport and CO 2 assimilation, and also triggered the synthesis of ROS that disrupt cellular structure and inhibit cell growth.
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abstractThis 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 psa B and rbc L to 7.09 and 29.83% of the control, respectively. Our results demonstrate that paraquat inhibited electron transport and CO 2 assimilation, and also triggered the synthesis of ROS that disrupt cellular structure and inhibit cell growth.
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