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Physiological and biochemical microcystin-RR toxicity to the Synechococcus elongatus
Hu, ZQ; Liu, YD; Li, DH; Liu, YD, Chinese Acad Sci, Inst Hydrobiol, Wuhan 430072, Hubei, Peoples R China
2004-12-01
Source PublicationENVIRONMENTAL TOXICOLOGY
ISSN1520-4081
Volume19Issue:6Pages:571-577
AbstractFreshwater Microcystis may form dense blooms in eutrophic lakes. It is known to produce a family of related cyclic hepatopeptides (microcystins, MC) that constitute a threat to aquatic ecosystems. Most toxicological studies of microcystins have focused on aquatic animals and plants, with few examining the possible effects of microcystins on phytoplankton. In this study we chose the unicellular Synechococcus elongatus (one of the most studied and geographically most widely distributed cyanobacteria in the picoplankton) as the test material and investigated the biological parameters: growth, pigment (chlorophyll-a, phycocyanin), photosynthetic activity, nitrate reductase activity, and protein and carbohydrate content. The results revealed that microcystin-RR concentrations above 100 mug (.) L-1 significantly inhibited the growth of Synechococcus elongatus. In addition, a change in color of the toxin-treated algae (chlorosis) was observed in the experiments. Furthermore, MC-RR markedly inhibited the synthesis of the pigments chlorophyll-a and phycocyanin. A drastic reduction in photochemical efficiency of PSII (F-v/F-m) was found after a 96-h incubation. Changes in protein and carbohydrate concentrations and in nitrate reductase activity also were observed during the exposure period. This study aimed to evaluate the mechanisms of microcystin toxicity on a cyanobacterium, according to the physiological and biochemical responses of Synechococcus elongatus to different doses of microcystin-RR. The ecological role of microcystins as an allelopathic substance also is discussed in the article. (C) 2004 Wiley Periodicals, Inc.; Freshwater Microcystis may form dense blooms in eutrophic lakes. It is known to produce a family of related cyclic hepatopeptides (microcystins, MC) that constitute a threat to aquatic ecosystems. Most toxicological studies of microcystins have focused on aquatic animals and plants, with few examining the possible effects of microcystins on phytoplankton. In this study we chose the unicellular Synechococcus elongatus (one of the most studied and geographically most widely distributed cyanobacteria in the picoplankton) as the test material and investigated the biological parameters: growth, pigment (chlorophyll-a, phycocyanin), photosynthetic activity, nitrate reductase activity, and protein and carbohydrate content. The results revealed that microcystin-RR concentrations above 100 mug (.) L-1 significantly inhibited the growth of Synechococcus elongatus. In addition, a change in color of the toxin-treated algae (chlorosis) was observed in the experiments. Furthermore, MC-RR markedly inhibited the synthesis of the pigments chlorophyll-a and phycocyanin. A drastic reduction in photochemical efficiency of PSII (F-v/F-m) was found after a 96-h incubation. Changes in protein and carbohydrate concentrations and in nitrate reductase activity also were observed during the exposure period. This study aimed to evaluate the mechanisms of microcystin toxicity on a cyanobacterium, according to the physiological and biochemical responses of Synechococcus elongatus to different doses of microcystin-RR. The ecological role of microcystins as an allelopathic substance also is discussed in the article. (C) 2004 Wiley Periodicals, Inc.
SubtypeArticle
KeywordMicrocystin-rr Growth Synechococcus Elongatus Pigment Chlorophyll Fluorescence Protein Carbohydrate Nitrate Reductase Toxicity
DepartmentChinese Acad Sci, Inst Hydrobiol, Wuhan 430072, Hubei, Peoples R China
Subject AreaEnvironmental Sciences ; Toxicology ; Water Resources
DOI10.1002/tox.20064
WOS HeadingsScience & Technology ; Life Sciences & Biomedicine ; Physical Sciences
Indexed BySCI
Language英语
WOS Research AreaEnvironmental Sciences & Ecology ; Toxicology ; Water Resources
WOS SubjectEnvironmental Sciences ; Toxicology ; Water Resources
WOS IDWOS:000225484100004
WOS KeywordCYANOBACTERIUM FISCHERELLA MUSCICOLA ; TOXIN PRODUCTION ; AERUGINOSA ; LR ; CYANOTOXINS ; GROWTH ; METABOLITES ; SURVIVAL ; DAPHNIA ; TROUT
Citation statistics
Cited Times:37[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.ihb.ac.cn/handle/152342/9376
Collection期刊论文
Corresponding AuthorLiu, YD, Chinese Acad Sci, Inst Hydrobiol, Wuhan 430072, Hubei, Peoples R China
AffiliationChinese Acad Sci, Inst Hydrobiol, Wuhan 430072, Hubei, Peoples R China
Recommended Citation
GB/T 7714
Hu, ZQ,Liu, YD,Li, DH,et al. Physiological and biochemical microcystin-RR toxicity to the Synechococcus elongatus[J]. ENVIRONMENTAL TOXICOLOGY,2004,19(6):571-577.
APA Hu, ZQ,Liu, YD,Li, DH,&Liu, YD, Chinese Acad Sci, Inst Hydrobiol, Wuhan 430072, Hubei, Peoples R China.(2004).Physiological and biochemical microcystin-RR toxicity to the Synechococcus elongatus.ENVIRONMENTAL TOXICOLOGY,19(6),571-577.
MLA Hu, ZQ,et al."Physiological and biochemical microcystin-RR toxicity to the Synechococcus elongatus".ENVIRONMENTAL TOXICOLOGY 19.6(2004):571-577.
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