| 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 Publication | EUROPEAN JOURNAL OF PHYCOLOGY
 |
| ISSN | 0967-0262 |
| Volume | 43Issue:3Pages:297-307 |
| Abstract | 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. |
| Subtype | Article |
| Keyword | Photosynthesis 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 Area | Plant Sciences ; Marine & Freshwater Biology |
| DOI | 10.1080/09670260801986837 |
| WOS Headings | Science & Technology ; Life Sciences & Biomedicine |
| Funding Organization | 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] ; Ministry of Science and Technology [2006AA10A413]; Ministry of Education [308015] |
| Indexed By | SCI |
| Language | 英语 |
| WOS Research Area | Plant Sciences ; Marine & Freshwater Biology |
| WOS Subject | Plant Sciences ; Marine & Freshwater Biology |
| WOS ID | WOS:000259086000006 |
| WOS Keyword | 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 |
| Funding Organization | 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] ; Ministry of Science and Technology [2006AA10A413]; Ministry of Education [308015] |
| Citation statistics | |
| Document Type | 期刊论文 |
| Identifier | http://ir.ihb.ac.cn/handle/152342/8014 |
| Collection | 期刊论文 |
| Corresponding Author | Gao, K, Shantou Univ, Inst Marine Biol, Shantou 515063, Guangdong, Peoples R China |
| Affiliation | 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 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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