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Different tolerances and responses to low temperature and darkness between waterbloom forming cyanobacterium Microcystis and a green alga Scenedesmus
Wu, Zhongxing; Song, Lirong; Li, Renhui; Li, RH, Chinese Acad Sci, Inst Hydrobiol, Wuhan 430072, Hubei, Peoples R China
2008
Source PublicationHYDROBIOLOGIA
ISSN0018-8158
Volume596Issue:0Pages:47-55
AbstractThe dynamics of planktonic cyanobacteria in eutrophicated freshwaters play an important role in formation of annual summer blooms, yet overwintering mechanisms of these water bloom forming cyanobacteria remain unknown. The responses to darkness and low temperature of three strains (unicellular Microcystis aeruginosa FACHB-905, colonial M. aeruginosa FACHB-938, and a green alga Scenedesmus quadricauda FACHB-45) were investigated in the present study. After a 30-day incubation under darkness and low temperature, cell morphology, cell numbers, chlorophyll a, photosynthetic activity (ETRmax and I-k), and malodialdehyde (MDA) content exhibited significant changes in Scenedesmus. In contrast, Microcystis aeruginosa cells did not change markedly in morphology, chlorophyll a, photosynthetic activity, and MDA content. The stress caused by low temperature and darkness resulted in an increase of the antioxidative enzyme-catalase (CAT) in all three strains. When the three strains re-grew under routine cultivated condition subjected to darkness and low temperature, specific growth rate of Scenedesmus was lower than that of Microcystis. Flow cytometry (FCM) examination indicated that two distinct types of metabolic response to darkness and low temperature existed in the three strains. The results from the present study reveal that the cyanobacterium Microcystis, especially colonial Microcystis, has greater endurance and adaptation ability to the stress of darkness and low temperature than the green alga Scenedesmus.; The dynamics of planktonic cyanobacteria in eutrophicated freshwaters play an important role in formation of annual summer blooms, yet overwintering mechanisms of these water bloom forming cyanobacteria remain unknown. The responses to darkness and low temperature of three strains (unicellular Microcystis aeruginosa FACHB-905, colonial M. aeruginosa FACHB-938, and a green alga Scenedesmus quadricauda FACHB-45) were investigated in the present study. After a 30-day incubation under darkness and low temperature, cell morphology, cell numbers, chlorophyll a, photosynthetic activity (ETRmax and I-k), and malodialdehyde (MDA) content exhibited significant changes in Scenedesmus. In contrast, Microcystis aeruginosa cells did not change markedly in morphology, chlorophyll a, photosynthetic activity, and MDA content. The stress caused by low temperature and darkness resulted in an increase of the antioxidative enzyme-catalase (CAT) in all three strains. When the three strains re-grew under routine cultivated condition subjected to darkness and low temperature, specific growth rate of Scenedesmus was lower than that of Microcystis. Flow cytometry (FCM) examination indicated that two distinct types of metabolic response to darkness and low temperature existed in the three strains. The results from the present study reveal that the cyanobacterium Microcystis, especially colonial Microcystis, has greater endurance and adaptation ability to the stress of darkness and low temperature than the green alga Scenedesmus.
SubtypeArticle
KeywordDarkness Low Temperature Response Tolerance Microcystis Scenedesmus
Department[Wu, Zhongxing; Song, Lirong; Li, Renhui] Chinese Acad Sci, Inst Hydrobiol, Wuhan 430072, Hubei, Peoples R China
Subject AreaMarine & Freshwater Biology
DOI10.1007/s10750-007-9056-7
WOS HeadingsScience & Technology ; Life Sciences & Biomedicine
Indexed BySCI
Language英语
WOS Research AreaMarine & Freshwater Biology
WOS SubjectMarine & Freshwater Biology
WOS IDWOS:000251729800005
WOS KeywordMETABOLIC-ACTIVITY ; STRESS TOLERANCE ; AERUGINOSA ; PHOTOSYNTHESIS ; SURVIVAL ; GROWTH ; SUSCEPTIBILITY ; CHLOROPHYCEAE ; CYANOPHYCEAE ; RESPIRATION
Citation statistics
Cited Times:32[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.ihb.ac.cn/handle/152342/8336
Collection期刊论文
Corresponding AuthorLi, RH, 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
Wu, Zhongxing,Song, Lirong,Li, Renhui,et al. Different tolerances and responses to low temperature and darkness between waterbloom forming cyanobacterium Microcystis and a green alga Scenedesmus[J]. HYDROBIOLOGIA,2008,596(0):47-55.
APA Wu, Zhongxing,Song, Lirong,Li, Renhui,&Li, RH, Chinese Acad Sci, Inst Hydrobiol, Wuhan 430072, Hubei, Peoples R China.(2008).Different tolerances and responses to low temperature and darkness between waterbloom forming cyanobacterium Microcystis and a green alga Scenedesmus.HYDROBIOLOGIA,596(0),47-55.
MLA Wu, Zhongxing,et al."Different tolerances and responses to low temperature and darkness between waterbloom forming cyanobacterium Microcystis and a green alga Scenedesmus".HYDROBIOLOGIA 596.0(2008):47-55.
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