CO_2对微拟球藻(Nannochloropsis sp.)利用有机碳和光合作用的影响  

Effects of CO_2 on the Organic Carbon Utilization and Photosynthesis of Nannochloropsis sp.

作　　者：胡晗华[1] 高坤山[1] 

机构地区：[1]中国科学院水生生物研究所,武汉430072

出　　处：《植物生理学通讯》2006年第4期633-637,共5页Plant Physiology Communications

基　　金：国家自然科学基金(30070582)。

摘　　要：CO2浓度提高时,微拟球藻吸收醋酸钠的速率增加2倍。混养生长的藻细胞最大光合作用速率、光合作用效率、无机碳半饱和常数和无机碳饱和的光合作用速率均显著低于光自养条件下生长的。Effects of elevated CO2 on photosynthetic activity and the utilization of dissolved organic carbon （DOC） of Nannochloropsis sp. were studied in this paper. When elevated CO2 reached 2 800 μL.L^-1, the organic carbon uptake increased 2 times compared with that of 350 μL.L^-1 in mixotrophic culture. Light-saturated photosynthetic rate （Pro）, photosynthetic efficiency （a）, half saturation coefficient （Ku2）, and inorganic carbonsaturated photosynthesis rate （Vm） for mixotrophic cells were significantly lower than those of photoautotrophic ones. It indicated that the uptake of acetate by Nannochloropsis sp. required energy, and enhanced CO2 decreased the energy cost for the operation of CO2 concentration mechanism, hence providing more energy for the uptake of organic carbon and accelerating the organic carbon uptake rate.

关 键 词：CO2 醋酸盐 光合作用 微拟球(Nannochloropsis sp.) 有机碳 

分 类 号：Q943.1[生物学—植物学]