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Effects of solar UV radiation on morphology and photosynthesis of filamentous cyanobacterium Arthrospira platensis
Wu, HY; Gao, KS; Villafane, VE; Watanabe, T; Helbling, EW; Gao, KS, Shantou Univ, Inst Marine Biol, Shantou 515063, Guangdong, Peoples R China
2005-09-01
Source PublicationAPPLIED AND ENVIRONMENTAL MICROBIOLOGY
ISSN0099-2240
Volume71Issue:9Pages:5004-5013
AbstractTo study the impact of solar UV radiation (UVR) (280 to 400 nm) on the filamentous cyanobacterium Arthrospira (Spirulina) platensis, we examined the morphological changes and photosynthetic performance using an indoor-grown strain (which had not been exposed to sunlight for decades) and an outdoor-grown strain (which had been grown under sunlight for decades) while they were cultured with three solar radiation treatments: PAB (photosynthetically active radiation [PAR] plus UVR; 280 to 700 nm), PA (PAR plus UV-A; 320 to 700 nm), and P (PAR only; 400 to 700 nm). Solar UVR broke the spiral filaments of A. platensis exposed to full solar radiation in short-term low-cell-density cultures. This breakage was observed after 2 h for the indoor strain but after 4 to 6 h for the outdoor strain. Filament breakage also occurred in the cultures exposed to PAR alone; however, the extent of breakage was less than that observed for filaments exposed to full solar radiation. The spiral filaments broke and compressed when high-cell-density cultures were exposed to full solar radiation during long-term experiments. When UV-B was screened off, the filaments initially broke, but they elongated and became loosely arranged later (i.e., there were fewer spirals per unit of filament length). When UVR was filtered out, the spiral structure hardly broke or became looser. Photosynthetic 0, evolution in the presence of UVR was significantly suppressed in the indoor strain compared to the outdoor strain. UVR-induced inhibition increased with exposure time, and it was significantly lower in the outdoor strain. The concentration of UV-absorbing compounds was low in both strains, and there was no significant change in the amount regardless of the radiation treatment, suggesting that these compounds were not effectively used as protection against solar UVR. Self-shading, on the other hand, produced by compression of the spirals over adaptive time scales, seems to play an important role in protecting this species against deleterious UVR. Our findings suggest that the increase in UV-B irradiance due to ozone depletion not only might affect photosynthesis but also might alter the morphological development of filamentous cyanobacteria during acclimation or over adaptive time scales.; To study the impact of solar UV radiation (UVR) (280 to 400 nm) on the filamentous cyanobacterium Arthrospira (Spirulina) platensis, we examined the morphological changes and photosynthetic performance using an indoor-grown strain (which had not been exposed to sunlight for decades) and an outdoor-grown strain (which had been grown under sunlight for decades) while they were cultured with three solar radiation treatments: PAB (photosynthetically active radiation [PAR] plus UVR; 280 to 700 nm), PA (PAR plus UV-A; 320 to 700 nm), and P (PAR only; 400 to 700 nm). Solar UVR broke the spiral filaments of A. platensis exposed to full solar radiation in short-term low-cell-density cultures. This breakage was observed after 2 h for the indoor strain but after 4 to 6 h for the outdoor strain. Filament breakage also occurred in the cultures exposed to PAR alone; however, the extent of breakage was less than that observed for filaments exposed to full solar radiation. The spiral filaments broke and compressed when high-cell-density cultures were exposed to full solar radiation during long-term experiments. When UV-B was screened off, the filaments initially broke, but they elongated and became loosely arranged later (i.e., there were fewer spirals per unit of filament length). When UVR was filtered out, the spiral structure hardly broke or became looser. Photosynthetic 0, evolution in the presence of UVR was significantly suppressed in the indoor strain compared to the outdoor strain. UVR-induced inhibition increased with exposure time, and it was significantly lower in the outdoor strain. The concentration of UV-absorbing compounds was low in both strains, and there was no significant change in the amount regardless of the radiation treatment, suggesting that these compounds were not effectively used as protection against solar UVR. Self-shading, on the other hand, produced by compression of the spirals over adaptive time scales, seems to play an important role in protecting this species against deleterious UVR. Our findings suggest that the increase in UV-B irradiance due to ozone depletion not only might affect photosynthesis but also might alter the morphological development of filamentous cyanobacteria during acclimation or over adaptive time scales.
SubtypeArticle
KeywordUltraviolet-b Radiation Induced Dna-damage Blue-green-alga Spirulina-platensis Nitrogen-metabolism Ozone Depletion Light Irradiation Repair Photoinhibition
DepartmentShantou Univ, Inst Marine Biol, Shantou 515063, Guangdong, Peoples R China; Chinese Acad Sci, Inst Hydrobiol, Wuhan 430072, Hubei, Peoples R China; Estac Fotobiol Playa Union, RA-9103 Rawson, Chubut, Argentina; Consejo Nacl Invest Cient & Tecn, RA-9103 Rawson, Chubut, Argentina; Hainan DIC Microalgae Co Ltd, Haikou Int Commercial Ctr, Haikou 570102, Hainan, Peoples R China
Subject AreaBiotechnology & Applied Microbiology ; Microbiology
DOI10.1128/AEM.71.9.5004-5013.2005
WOS HeadingsScience & Technology ; Life Sciences & Biomedicine
Indexed BySCI
Language英语
WOS Research AreaBiotechnology & Applied Microbiology ; Microbiology
WOS SubjectBiotechnology & Applied Microbiology ; Microbiology
WOS IDWOS:000231897400009
WOS KeywordULTRAVIOLET-B RADIATION ; INDUCED DNA-DAMAGE ; BLUE-GREEN-ALGA ; SPIRULINA-PLATENSIS ; NITROGEN-METABOLISM ; OZONE DEPLETION ; LIGHT ; IRRADIATION ; REPAIR ; PHOTOINHIBITION
Citation statistics
Cited Times:92[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.ihb.ac.cn/handle/152342/9156
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, Wuhan 430072, Hubei, Peoples R China
3.Estac Fotobiol Playa Union, RA-9103 Rawson, Chubut, Argentina
4.Consejo Nacl Invest Cient & Tecn, RA-9103 Rawson, Chubut, Argentina
5.Hainan DIC Microalgae Co Ltd, Haikou Int Commercial Ctr, Haikou 570102, Hainan, Peoples R China
Recommended Citation
GB/T 7714
Wu, HY,Gao, KS,Villafane, VE,et al. Effects of solar UV radiation on morphology and photosynthesis of filamentous cyanobacterium Arthrospira platensis[J]. APPLIED AND ENVIRONMENTAL MICROBIOLOGY,2005,71(9):5004-5013.
APA Wu, HY,Gao, KS,Villafane, VE,Watanabe, T,Helbling, EW,&Gao, KS, Shantou Univ, Inst Marine Biol, Shantou 515063, Guangdong, Peoples R China.(2005).Effects of solar UV radiation on morphology and photosynthesis of filamentous cyanobacterium Arthrospira platensis.APPLIED AND ENVIRONMENTAL MICROBIOLOGY,71(9),5004-5013.
MLA Wu, HY,et al."Effects of solar UV radiation on morphology and photosynthesis of filamentous cyanobacterium Arthrospira platensis".APPLIED AND ENVIRONMENTAL MICROBIOLOGY 71.9(2005):5004-5013.
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