Effects of solar UV radiation on diurnal photosynthetic performance and growth of Gracilaria lemaneiformis (Rhodophyta)
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...
Published in: | European Journal of Phycology |
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ftchinacadsciihb:oai:ir.ihb.ac.cn:152342/8014 2023-05-15T14:02:07+02:00 Effects of solar UV radiation on diurnal photosynthetic performance and growth of Gracilaria lemaneiformis (Rhodophyta) Gao, Kunshan Xu, Juntian Gao, K, Shantou Univ, Inst Marine Biol, Shantou 515063, Guangdong, Peoples R China 2008 http://ir.ihb.ac.cn/handle/152342/8014 https://doi.org/10.1080/09670260801986837 英语 eng EUROPEAN JOURNAL OF PHYCOLOGY 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 http://ir.ihb.ac.cn/handle/152342/8014 doi:10.1080/09670260801986837 Photosynthesis Gracilaria Lemaneiformis Growth Red Alga Uv-absorbing Compounds Uv Radiation Plant Sciences Marine & Freshwater Biology Science & Technology Life Sciences & Biomedicine 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 Article 期刊论文 2008 ftchinacadsciihb https://doi.org/10.1080/09670260801986837 2019-07-01T11:26:42Z 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. 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. Article in Journal/Newspaper Antarc* Antarctic Institute of Hydrobiology, Chinese Academy of Sciences: IHB OpenIR Antarctic European Journal of Phycology 43 3 297 307 |
institution |
Open Polar |
collection |
Institute of Hydrobiology, Chinese Academy of Sciences: IHB OpenIR |
op_collection_id |
ftchinacadsciihb |
language |
English |
topic |
Photosynthesis Gracilaria Lemaneiformis Growth Red Alga Uv-absorbing Compounds Uv Radiation Plant Sciences Marine & Freshwater Biology Science & Technology Life Sciences & Biomedicine 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 |
spellingShingle |
Photosynthesis Gracilaria Lemaneiformis Growth Red Alga Uv-absorbing Compounds Uv Radiation Plant Sciences Marine & Freshwater Biology Science & Technology Life Sciences & Biomedicine 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 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) |
topic_facet |
Photosynthesis Gracilaria Lemaneiformis Growth Red Alga Uv-absorbing Compounds Uv Radiation Plant Sciences Marine & Freshwater Biology Science & Technology Life Sciences & Biomedicine 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 |
description |
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. 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. |
format |
Article in Journal/Newspaper |
author |
Gao, Kunshan Xu, Juntian Gao, K, Shantou Univ, Inst Marine Biol, Shantou 515063, Guangdong, Peoples R China |
author_facet |
Gao, Kunshan Xu, Juntian Gao, K, Shantou Univ, Inst Marine Biol, Shantou 515063, Guangdong, Peoples R China |
author_sort |
Gao, Kunshan |
title |
Effects of solar UV radiation on diurnal photosynthetic performance and growth of Gracilaria lemaneiformis (Rhodophyta) |
title_short |
Effects of solar UV radiation on diurnal photosynthetic performance and growth of Gracilaria lemaneiformis (Rhodophyta) |
title_full |
Effects of solar UV radiation on diurnal photosynthetic performance and growth of Gracilaria lemaneiformis (Rhodophyta) |
title_fullStr |
Effects of solar UV radiation on diurnal photosynthetic performance and growth of Gracilaria lemaneiformis (Rhodophyta) |
title_full_unstemmed |
Effects of solar UV radiation on diurnal photosynthetic performance and growth of Gracilaria lemaneiformis (Rhodophyta) |
title_sort |
effects of solar uv radiation on diurnal photosynthetic performance and growth of gracilaria lemaneiformis (rhodophyta) |
publishDate |
2008 |
url |
http://ir.ihb.ac.cn/handle/152342/8014 https://doi.org/10.1080/09670260801986837 |
geographic |
Antarctic |
geographic_facet |
Antarctic |
genre |
Antarc* Antarctic |
genre_facet |
Antarc* Antarctic |
op_relation |
EUROPEAN JOURNAL OF PHYCOLOGY 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 http://ir.ihb.ac.cn/handle/152342/8014 doi:10.1080/09670260801986837 |
op_doi |
https://doi.org/10.1080/09670260801986837 |
container_title |
European Journal of Phycology |
container_volume |
43 |
container_issue |
3 |
container_start_page |
297 |
op_container_end_page |
307 |
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1766272212304658432 |