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Effects of solar ultraviolet radiation on photosynthesis of the marine red tide alga Heterosigma akashiwo (Raphidophyceae)
Gao, Kunshan; Guan, Wanchun; Helbling, E. Walter; Gao, KS, Shantou Univ, Inst Marine Biol, Shantou 515063, Guangdong, Peoples R China
2007-02-01
Source PublicationJOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY B-BIOLOGY
ISSN1011-1344
Volume86Issue:2Pages:140-148
AbstractIn order to assess the short- and long-term impacts of UV radiation (LTVR, 280-400 nm) on the red tide alga, Heterosigma akashiwo, we exposed the cells to three different solar radiation treatments (PAB: 280-700 rim, PA: 320-700 nm, R 400-700 nm) under both solar and artificial radiation. A significant decrease in the effective quantum yield () during high irradiance periods (i.e., local noon) was observed, but the cells partially recovered during the evening hours. Exposure to high irradiances for 15, 30, and 60 min under a solar simulator followed by the recovery (8 h) under dark, 9 and 100 mu mol photons m(-2) s(-1) of PAR, highlighted the importance of the irradiance level during the recovery period. Regardless the radiation treatments, the highest recovery (both in rate and total Y) was found at a PAR irradiance of 9 mu mol photons m(-2) s(-1), while the lowest was observed at 100 mu mol photons m(-2) s(-1). In all experiments, PAR was responsible for most of the observed inhibition; nevertheless, the cells exposed only to PAR had the highest recovery in any condition, as compared to the other radiation treatments. In long-term experiments (10 days) using semi-continuous cultures, there was a significant increase of UV-absorbing compounds (UVabc) per cell from 1.2 to > 4 x 10(-6) mu g UVabc cell(-1) during the first 3-5 days of exposure to solar radiation. The highest concentration of UVabc was found in samples exposed in the PAB as compared to PA and P treatments. Growth rates (mu) mimic the behavior of UV-absorbing compounds, and during the first 5 days mu increased from < 0.2 to ca. 0.8, and stayed relatively constant at this value during the rest of the experiment. The inhibition of the Y decreased with increasing acclimation of cells. All our data indicates that H. akashiwo is a sensitive species, but was able acclimate relatively fast (3-5 days) synthesizing UV-absorbing compounds and thus reducing any impact either on photosystem 11 or on growth. (c) 2006 Published by Elsevier B.V.; In order to assess the short- and long-term impacts of UV radiation (LTVR, 280-400 nm) on the red tide alga, Heterosigma akashiwo, we exposed the cells to three different solar radiation treatments (PAB: 280-700 rim, PA: 320-700 nm, R 400-700 nm) under both solar and artificial radiation. A significant decrease in the effective quantum yield () during high irradiance periods (i.e., local noon) was observed, but the cells partially recovered during the evening hours. Exposure to high irradiances for 15, 30, and 60 min under a solar simulator followed by the recovery (8 h) under dark, 9 and 100 mu mol photons m(-2) s(-1) of PAR, highlighted the importance of the irradiance level during the recovery period. Regardless the radiation treatments, the highest recovery (both in rate and total Y) was found at a PAR irradiance of 9 mu mol photons m(-2) s(-1), while the lowest was observed at 100 mu mol photons m(-2) s(-1). In all experiments, PAR was responsible for most of the observed inhibition; nevertheless, the cells exposed only to PAR had the highest recovery in any condition, as compared to the other radiation treatments. In long-term experiments (10 days) using semi-continuous cultures, there was a significant increase of UV-absorbing compounds (UVabc) per cell from 1.2 to > 4 x 10(-6) mu g UVabc cell(-1) during the first 3-5 days of exposure to solar radiation. The highest concentration of UVabc was found in samples exposed in the PAB as compared to PA and P treatments. Growth rates (mu) mimic the behavior of UV-absorbing compounds, and during the first 5 days mu increased from < 0.2 to ca. 0.8, and stayed relatively constant at this value during the rest of the experiment. The inhibition of the Y decreased with increasing acclimation of cells. All our data indicates that H. akashiwo is a sensitive species, but was able acclimate relatively fast (3-5 days) synthesizing UV-absorbing compounds and thus reducing any impact either on photosystem 11 or on growth. (c) 2006 Published by Elsevier B.V.
SubtypeArticle
KeywordGrowth Heterosigma Akashiwo Uv-absorbing Compounds Photosynthetic Quantum Yield Toxic Blooms Uvr
DepartmentShantou Univ, Inst Marine Biol, Shantou 515063, Guangdong, Peoples R China; Chinese Acad Sci, Inst Hydrobiol, State Key Lab Freshwater Ecol & Biotechnol, Wuhan 430072, Peoples R China; Consejo Nacl Invest Cient & Tecn, RA-9103 Rawson, Chubut, Argentina; Estac Fotobiol Playa Union, RA-9103 Rawson, Chubut, Argentina
Subject AreaBiochemistry & Molecular Biology ; Biophysics
DOI10.1016/j.jphotobiol.2006.05.007
WOS HeadingsScience & Technology ; Life Sciences & Biomedicine
Indexed BySCI
Language英语
WOS Research AreaBiochemistry & Molecular Biology ; Biophysics
WOS SubjectBiochemistry & Molecular Biology ; Biophysics
WOS IDWOS:000244163500006
WOS KeywordPHOTOSYSTEM-II ; UV-RADIATION ; PHYTOPLANKTON ASSEMBLAGES ; B IRRADIATION ; ORGANISMS ; DAMAGE ; LIGHT ; PHOTOINHIBITION ; CYANOBACTERIA ; EXPOSURE
Citation statistics
Cited Times:35[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.ihb.ac.cn/handle/152342/8692
Collection期刊论文
Corresponding AuthorGao, KS, Shantou Univ, Inst Marine Biol, Shantou 515063, Guangdong, Peoples R China
Affiliation1.Shantou Univ, Inst Marine Biol, Shantou 515063, Guangdong, Peoples R China
2.Chinese Acad Sci, Inst Hydrobiol, State Key Lab Freshwater Ecol & Biotechnol, Wuhan 430072, Peoples R China
3.Consejo Nacl Invest Cient & Tecn, RA-9103 Rawson, Chubut, Argentina
4.Estac Fotobiol Playa Union, RA-9103 Rawson, Chubut, Argentina
Recommended Citation
GB/T 7714
Gao, Kunshan,Guan, Wanchun,Helbling, E. Walter,et al. Effects of solar ultraviolet radiation on photosynthesis of the marine red tide alga Heterosigma akashiwo (Raphidophyceae)[J]. JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY B-BIOLOGY,2007,86(2):140-148.
APA Gao, Kunshan,Guan, Wanchun,Helbling, E. Walter,&Gao, KS, Shantou Univ, Inst Marine Biol, Shantou 515063, Guangdong, Peoples R China.(2007).Effects of solar ultraviolet radiation on photosynthesis of the marine red tide alga Heterosigma akashiwo (Raphidophyceae).JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY B-BIOLOGY,86(2),140-148.
MLA Gao, Kunshan,et al."Effects of solar ultraviolet radiation on photosynthesis of the marine red tide alga Heterosigma akashiwo (Raphidophyceae)".JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY B-BIOLOGY 86.2(2007):140-148.
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