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Impacts of increased atmospheric CO_2.concentration on photosynthesis and growth of micro-and macro-algae

Science china(Life Sciences) 2008年第12期51卷 1144-1150页

作者： wu hongyan1, zou dinghui1 & gao kunshan2.1 marine biology institute,{2., shantou 515063, china 2.State Key Laboratory of marine Environmental Science, Xiamen university, Xiamen 361005, china marine biology {2. Shantou University Shantou China State Key Laboratory of marine Environmental Science Xiamen University Xiamen China

marine photosynthesis drives the oceanic biological CO2.pump to absorb CO2.from the atmosphere, which sinks more than one third of the industry-originated CO2.into the ocean. The increasing atmos-pheric CO2.and subsequent rise of pCO2.in seawater, which alters the carbonate system and related chemical reactions and results in lower pH and higher HCO3- concentration, affect photosynthetic CO2.fixation processes of phytoplanktonic and macroalgal species in direct and/or indirect ways. Although many unicellular and multicellular species can operate CO2.concentrating mechanisms (CCMs) to util-ize the large HCO3- pool in seawater, enriched CO2.up to several times the present atmospheric level has been shown to enhance photosynthesis and growth of both phytoplanktonic and macro-species that have less capacity of CCMs. Even for species that operate active CCMs and those whose photo-synthesis is not limited by CO2.in seawater, increased CO2.levels can down-regulate their CCMs and therefore enhance their growth under light-limiting conditions (at higher CO2.levels, less light energy is required to drive CCM). Altered physiological performances under high-CO2.conditions may cause genetic alteration in view of adaptation over long time scale. marine algae may adapt to a high CO2.oceanic environment so that the evolved communities in future are likely to be genetically different from the contemporary communities. However, most of the previous studies have been carried out under indoor conditions without considering the acidifying effects on seawater by increased CO2.and other interacting environmental factors, and little has been documented so far to explain how physi-ology of marine primary producers performs in a high-CO2.and low-pH ocean.

关键词： CO2 photosynthesis growth phytoplankton macroalgae

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Impacts of increased atmospheric CO2.concentration on photosynthesis and growth of micro-and macro-algae

Impacts of increased atmospheric CO2 concentration on photos...

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纪念殷宏章先生百年诞辰暨全国光合作用学术研讨会

作者： hongyan wu1, {2. {2.1 , Kunshao gao2.1 {2. biology institute, shantou university, shantou, Guangdong, 515063, china 2.State Key Laboratory of {2. Environmental Science, Xiamen university, Xiamen, 361005, china

＜正＞marine photosynthesis drives oceanic biological CO2.pump to absorb CO2.from the atmosphere, which sinks more than one third of the industry-originated CO2.into the ocean. Increasing atmospheric CO2.and subsequen... 详细信息

关键词： Micro-algae Macro-algae CO2.concentration photosynthesis growth

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