| ZOU Dinghui,GAO Kunshan,XIA Jianrong. 2011. Dark respiration in the light and in darkness of three marine macroalgal species grown under ambient and elevated CO2 concentrations. Acta Oceanologica Sinica, (1):106－112 |
| Dark respiration in the light and in darkness of three marine macroalgal species grown under ambient and elevated CO2 concentrations |
| Dark respiration in the light and in darkness of three marine macroalgal species grown under ambient and elevated CO2 concentrations |
| Received:September 19, 2009 Revised:September 10, 2010 |
| DOI：10.1007/s13131-011-0096-5 |
| Key words:marine macroalgae respiration CO2 carbon balance |
| 中文关键词: marine macroalgae respiration CO2 carbon balance |
| 基金项目:The 973 Project under contract No. 2009CB421207; the National Natural Science Foundation of China under contract Nos 41076094 and 30970450; Program for New Century Excellent Talents in University under contract No. NCET-10-0375; the Fundamental Research Funds for the Central Universities, SCUT. |
| Author Name | Affiliation | E-mail | | ZOU Dinghui | College of Environmental Science and Engineering, South China University of Technology, Guangzhou 510006, China
The Key Laboratory of Pollution Control and Ecosystem Restoration in Industry Clusters, Ministry of Education, Guangzhou 510006, China | dhzou@scut.edu.cn | | GAO Kunshan | State Key Laboratory of Marine Environmental Science, Xiamen University, Xiamen 361005, China | | | XIA Jianrong | College of Environmental Science and Engineering, Guangzhou University, Guangzhou 510006, China | |
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| Abstract: |
| Dark respiration (non-photorespiratory mitochondrial respiration), which occurs both in the light and in darkness, is vital for growth and survival of algae and plays a critical role in modulating the carbon balance of them. In the present study, we have investigated dark respiration in the light (RL) and in darkness (RD) in three marine macroalgal species, Hizikia fusiformis (phaeophyta), Gracilaria lemaneiformis (Rhodophyta) and Ulva lactuca (Chlorophyta), cultured at 20 ℃ using aeration with two CO2 conditions:current ambient (CO2 concentration about 380 μl/L) and elevated CO2 (approximately 720 μl/L) air. RL was estimated by using the Kok method, whereas RD was determined as the rate of O2 influx at zero light. The results showed that both RL and RD were unchanged for the elevated CO2-grown algae relative to ambient CO2 concentration for all the algal species tested. However, RL was significantly lower than RD across all the algal species and growth CO2 treatments, demonstrating that daytime respiration was partly depressed by the light. The percentage of inhibition of respiration by light was similar between ambient and elevated CO2-grown algae. The ratio of respiration to photosynthesis, which tended to decrease when estimated using RL instead of RD, was not altered for the elevated relative to ambient CO2 concentration. The results suggest that RL, rather than RD, is a more accurate estimate of nonphotorespiratory carbon loss in marine macroalgae during the daytime. It would not be anticipated that elevated atmospheric CO2 would exert a substantial influence on respiratory flux either in the light or in darkness in these particular marine macroalgal species. |
| 中文摘要: |
| Dark respiration (non-photorespiratory mitochondrial respiration), which occurs both in the light and in darkness, is vital for growth and survival of algae and plays a critical role in modulating the carbon balance of them. In the present study, we have investigated dark respiration in the light (RL) and in darkness (RD) in three marine macroalgal species, Hizikia fusiformis (phaeophyta), Gracilaria lemaneiformis (Rhodophyta) and Ulva lactuca (Chlorophyta), cultured at 20 ℃ using aeration with two CO2 conditions:current ambient (CO2 concentration about 380 μl/L) and elevated CO2 (approximately 720 μl/L) air. RL was estimated by using the Kok method, whereas RD was determined as the rate of O2 influx at zero light. The results showed that both RL and RD were unchanged for the elevated CO2-grown algae relative to ambient CO2 concentration for all the algal species tested. However, RL was significantly lower than RD across all the algal species and growth CO2 treatments, demonstrating that daytime respiration was partly depressed by the light. The percentage of inhibition of respiration by light was similar between ambient and elevated CO2-grown algae. The ratio of respiration to photosynthesis, which tended to decrease when estimated using RL instead of RD, was not altered for the elevated relative to ambient CO2 concentration. The results suggest that RL, rather than RD, is a more accurate estimate of nonphotorespiratory carbon loss in marine macroalgae during the daytime. It would not be anticipated that elevated atmospheric CO2 would exert a substantial influence on respiratory flux either in the light or in darkness in these particular marine macroalgal species. |
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