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学科主题: Plant Sciences; Marine & Freshwater Biology
题名: Effects of solar UV radiation on diurnal photosynthetic performance and growth of Gracilaria lemaneiformis (Rhodophyta)
作者: Gao, Kunshan1, 2, 3; Xu, Juntian1
通讯作者: Gao, K, Shantou Univ, Inst Marine Biol, Shantou 515063, Guangdong, Peoples R China
关键词: photosynthesis ; Gracilaria lemaneiformis ; growth ; red alga ; UV-absorbing compounds ; UV radiation
刊名: EUROPEAN JOURNAL OF PHYCOLOGY
发表日期: 2008
DOI: 10.1080/09670260801986837
卷: 43, 期:3, 页:297-307
收录类别: SCI
文章类型: Article
部门归属: [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
WOS标题词: Science & Technology ; Life Sciences & Biomedicine
资助者: Ministry of Science and Technology [2006AA10A413]; Ministry of Education [308015]
类目[WOS]: Plant Sciences ; Marine & Freshwater Biology
研究领域[WOS]: Plant Sciences ; Marine & Freshwater Biology
摘要: 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.
英文摘要: 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.
关键词[WOS]: KELP MACROCYSTIS-PYRIFERA ; ANTARCTIC MARINE ORGANISMS ; ULVA-PERTUSA CHLOROPHYTA ; ALGA ASCOPHYLLUM-NODOSUM ; ULTRAVIOLET-B RADIATION ; INDUCED DNA-DAMAGE ; AMINO-ACIDS ; NATURAL SUNLIGHT ; DEPTH-ZONATION ; MACROALGAE
语种: 英语
WOS记录号: WOS:000259086000006
ISSN号: 0967-0262
Citation statistics:
内容类型: 期刊论文
URI标识: http://ir.ihb.ac.cn/handle/152342/8014
Appears in Collections:中科院水生所知识产出(2009年前)_期刊论文

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作者单位: 1.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:
Gao, Kunshan; Xu, Juntian.Effects of solar UV radiation on diurnal photosynthetic performance and growth of Gracilaria lemaneiformis (Rhodophyta),EUROPEAN JOURNAL OF PHYCOLOGY,2008,43(3):297-307
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