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Effects of solar UV radiation on diurnal photosynthetic performance and growth of Gracilaria lemaneiformis (Rhodophyta)
Gao, Kunshan1,2,3; Xu, Juntian1; Gao, K, Shantou Univ, Inst Marine Biol, Shantou 515063, Guangdong, Peoples R China
2008
Source PublicationEUROPEAN JOURNAL OF PHYCOLOGY
ISSN0967-0262
Volume43Issue:3Pages:297-307
AbstractPrevious studies on diurnal photosynthesis of macroalgal species have shown that at similar levels of photosynthetically active radiation (PAR, 400-700nm) the photosynthetic rate is lower in the afternoon than in the morning. However, the impacts of solar ultraviolet radiation (UVR, 280-400nm) have been little considered. We investigated the diurnal photosynthetic behaviour of the economically significant red alga Gracilaria lemaneiformis in the absence or presence of UV-A+B or UV-B with a flow-through system. While UV-A and UV-B, respectively, inhibited noontime Pmax by 22% and 14% on the sunny days, UV-A during sunrise (PAR below about 50Wm-2) increased the net photosynthesis by about 8% when compared with PAR alone. UV-A + PAR also resulted in higher apparent photosynthetic efficiency in the morning than in the afternoon period than PAR alone. Nevertheless, integrated daytime photosynthetic production under solar PAR alone was higher than with either PAR + UV-A+B or PAR + UV-A. Relative growth rate in the long term (9 days) matched the integrated photosynthetic production in that UV-A led to 9-15% and UV-B to 19-22% reduction, respectively. UV-absorbing compounds were found to be higher in the thalli exposed to PAR+UV-A+B than under PAR alone, reflecting a protective response to UVR.; Previous studies on diurnal photosynthesis of macroalgal species have shown that at similar levels of photosynthetically active radiation (PAR, 400-700nm) the photosynthetic rate is lower in the afternoon than in the morning. However, the impacts of solar ultraviolet radiation (UVR, 280-400nm) have been little considered. We investigated the diurnal photosynthetic behaviour of the economically significant red alga Gracilaria lemaneiformis in the absence or presence of UV-A+B or UV-B with a flow-through system. While UV-A and UV-B, respectively, inhibited noontime Pmax by 22% and 14% on the sunny days, UV-A during sunrise (PAR below about 50Wm-2) increased the net photosynthesis by about 8% when compared with PAR alone. UV-A + PAR also resulted in higher apparent photosynthetic efficiency in the morning than in the afternoon period than PAR alone. Nevertheless, integrated daytime photosynthetic production under solar PAR alone was higher than with either PAR + UV-A+B or PAR + UV-A. Relative growth rate in the long term (9 days) matched the integrated photosynthetic production in that UV-A led to 9-15% and UV-B to 19-22% reduction, respectively. UV-absorbing compounds were found to be higher in the thalli exposed to PAR+UV-A+B than under PAR alone, reflecting a protective response to UVR.
SubtypeArticle
KeywordPhotosynthesis Gracilaria Lemaneiformis Growth Red Alga Uv-absorbing Compounds Uv Radiation
Department[Gao, Kunshan; Xu, Juntian] Shantou Univ, Inst Marine Biol, Shantou 515063, Guangdong, Peoples R China; [Gao, Kunshan] Xiamen Univ, State Key Lab Marine Environm Sci, Xiamen 361005, Peoples R China; [Gao, Kunshan] Chinese Acad Sci, Inst Hydrobiol, State Key Lab Freshwater Ecol & Biotechnol, Wuhan 430072, Hubei, Peoples R China
Subject AreaPlant Sciences ; Marine & Freshwater Biology
DOI10.1080/09670260801986837
WOS HeadingsScience & Technology ; Life Sciences & Biomedicine
Funding OrganizationMinistry of Science and Technology [2006AA10A413]; Ministry of Education [308015] ; Ministry of Science and Technology [2006AA10A413]; Ministry of Education [308015] ; Ministry of Science and Technology [2006AA10A413]; Ministry of Education [308015] ; Ministry of Science and Technology [2006AA10A413]; Ministry of Education [308015]
Indexed BySCI
Language英语
WOS Research AreaPlant Sciences ; Marine & Freshwater Biology
WOS SubjectPlant Sciences ; Marine & Freshwater Biology
WOS IDWOS:000259086000006
WOS KeywordKELP MACROCYSTIS-PYRIFERA ; ANTARCTIC MARINE ORGANISMS ; ULVA-PERTUSA CHLOROPHYTA ; ALGA ASCOPHYLLUM-NODOSUM ; ULTRAVIOLET-B RADIATION ; INDUCED DNA-DAMAGE ; AMINO-ACIDS ; NATURAL SUNLIGHT ; DEPTH-ZONATION ; MACROALGAE
Funding OrganizationMinistry of Science and Technology [2006AA10A413]; Ministry of Education [308015] ; Ministry of Science and Technology [2006AA10A413]; Ministry of Education [308015] ; Ministry of Science and Technology [2006AA10A413]; Ministry of Education [308015] ; Ministry of Science and Technology [2006AA10A413]; Ministry of Education [308015]
Citation statistics
Cited Times:41[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.ihb.ac.cn/handle/152342/8014
Collection期刊论文
Corresponding AuthorGao, K, Shantou Univ, Inst Marine Biol, Shantou 515063, Guangdong, Peoples R China
Affiliation1.Shantou Univ, Inst Marine Biol, Shantou 515063, Guangdong, Peoples R China
2.Xiamen Univ, State Key Lab Marine Environm Sci, Xiamen 361005, Peoples R China
3.Chinese Acad Sci, Inst Hydrobiol, State Key Lab Freshwater Ecol & Biotechnol, Wuhan 430072, Hubei, Peoples R China
Recommended Citation
GB/T 7714
Gao, Kunshan,Xu, Juntian,Gao, K, Shantou Univ, Inst Marine Biol, Shantou 515063, Guangdong, Peoples R China. Effects of solar UV radiation on diurnal photosynthetic performance and growth of Gracilaria lemaneiformis (Rhodophyta)[J]. EUROPEAN JOURNAL OF PHYCOLOGY,2008,43(3):297-307.
APA Gao, Kunshan,Xu, Juntian,&Gao, K, Shantou Univ, Inst Marine Biol, Shantou 515063, Guangdong, Peoples R China.(2008).Effects of solar UV radiation on diurnal photosynthetic performance and growth of Gracilaria lemaneiformis (Rhodophyta).EUROPEAN JOURNAL OF PHYCOLOGY,43(3),297-307.
MLA Gao, Kunshan,et al."Effects of solar UV radiation on diurnal photosynthetic performance and growth of Gracilaria lemaneiformis (Rhodophyta)".EUROPEAN JOURNAL OF PHYCOLOGY 43.3(2008):297-307.
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