| Exogenous carbon acquisition of photosynthesis in Porphyra haitanensis (Bangiales, Rhodophyta) under emersed state |
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| 作者姓名： | ZOU Dinghui GAO Kunshan |
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| 作者单位： | Marine Biology Institute, Science Center, Shantou University, Guangdong 515063, China,Marine Biology Institute, Science Center, Shantou University, Guangdong 515063, China;Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan 430072, China |
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| 基金项目： | 国家自然科学基金，the Innovation Project of the Chinese Academy of Sciences |
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| 摘 要： | The photosynthetic performances of Porphyra haitanensis thalli were investigated in order to understand its mechanisms for exogenous carbon acquisition during emersion at low tide. The emersed photosynthesis was studied by altering the pH value in the water film on the thalli surface, treating them with carbonic anhydarase inhibitors (acetazolamide and 6-ethoxyzolamide), adjusting the CO2 concentrations in the air, and comparing the theoretical maximum CO2 supply rates within the adherent water film with the observed photosynthetic CO2 uptake rates. It was found that the principal exogenous inorganic carbon source for the photosynthesis of P. haitanensis during emersion was atmospheric CO2. The driving force of CO2 flux across the water film was the CO2 concentration gradient within it. Carbonic anhydrase accelerated both extracellular and intracellular CO2 transport. The emersed photosynthesis of P. haitanensis was limited by the present atmospheric CO2 level, and would be enhanced by atmospheric CO2 rise that would trigger global warming.
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| 关 键 词： | Porphyra haitanensis carbon dioxide photosynthesis emersion carbonic anhydrase |
Exogenous carbon acquisition of photosynthesis in Porphyra haitanensis (Bangiales, Rhodophyta) under emersed state |
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| ZOU Dinghui,GAO Kunshan.Exogenous carbon acquisition of photosynthesis in Porphyra haitanensis (Bangiales, Rhodophyta) under emersed state[J].Progress in Natural Science,2004,14(2):138-144. |
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| Authors: | ZOU Dinghui GAO Kunshan |
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| Institution: | 1. Marine Biology Institute, Science Center, Shantou University, Guangdong 515063, China
2. Marine Biology Institute, Science Center, Shantou University, Guangdong 515063, China;Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan 430072, China |
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| Abstract: | The photosynthetic performances of Porphyra haitanensis thalli were investigated in order to understand its mechanisms for exogenous carbon acquisition during emersion at low tide. The emersed photosynthesis was studied by altering the pH value in the water film on the thalli surface, treating them with carbonic anhydarase inhibitors (acetazolamide and 6-ethoxyzolamide), adjusting the CO2 concentrations in the air, and comparing the theoretical maximum CO2 supply rates within the adherent water film with the observed photosynthetic CO2 uptake rates. It was found that the principal exogenous inorganic carbon source for the photosynthesis of P. haitanensis during emersion was atmospheric CO2. The driving force of CO2 flux across the water film was the CO2 concentration gradient within it. Carbonic anhydrase accelerated both extracellular and intracellular CO2 transport. The emersed photosynthesis of P. haitanensis was limited by the present atmospheric CO2 level, and would be enhanced by atmospheric CO2 rise that would trigger global warming. |
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| Keywords: | Porphyra haitanensis carbon dioxide photosynthesis emersion carbonic anhydrase |
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