CO2浓度变化对拟柱胞藻生长与光合作用的影响  

EFFECTS OF CHANGED CO_2 CONCENTRATION ON GROWTH AND PHOTOSYNTHESIS OF CYLINDROSPERMOPSIS RACIBORSKII

作　　者：许金铸 白芳[1] 杨燕君[1] 吴忠兴[1] XU Jin-Zhu BAI Fang YANG Yan-Jun WU Zhong-Xing(Key Laboratory of Eco-environments in Three Gorges Reservoir Region （Ministry of Education）, Chongqing Key Laboratory of Plant Ecology and Resources Research in Three Gorges Reservoir Region, School of Life Science, Southwest University, Chongqing 400715, China)

机构地区：[1]西南大学生命科学学院,三峡库区生态环境教育部重点实验室,重庆市三峡库区植物生态与资源重点实验室,重庆400715

出　　处：《水生生物学报》2016年第6期1221-1226,共6页Acta Hydrobiologica Sinica

基　　金：国家自然科学基金(31170372);西南大学博士基金(SWU110065)资助~~

摘　　要：为了探讨大气CO_2浓度升高对水华藻类的影响,利用水华蓝藻—拟柱胞藻作为实验材料,研究了CO_2浓度升高对其生长生理和光合作用的影响,结果表明CO_2浓度升高,导致拟柱胞藻的生物量、最大光合放氧速率、光合效率显著增加。当CO_2浓度为700 mg/L以下,暗呼吸速率和光饱和点无明显影响,而CO_2浓度为1000 mg/L时,暗呼吸速率和光饱和点显著提高。随着CO_2浓度增加,藻细胞光合作用对无机碳的亲和力降低,同时胞外碳酸酐酶活性显著下降。这表明大气CO_2浓度的增加,有利于拟柱胞藻的生长和光合,进而增加了水华发生的风险。To explore the influence of elevated atmospheric CO_2 concentration on algae blooms, we studied effects of elevated CO_2 concentration on the growth, physiological and photosynthesis of a bloom-forming cyanobacterium, Cylindrospermopsis raciborskii. The results showed that elevated CO_2 concentration significantly increased the biomass,the maximum photosynthetic rate and photosynthetic efficiency of C. raciborskii. The concentration of CO_2 at 700 mg/L did not impact dark respiration rate and light saturation point of C. raciborskii but had significant effect at 1000 mg/L. The increased CO_2 reduced the affinity of algal cell photosynthesis to inorganic carbon and, the extracellular carbonic anhydrase activity. These results suggest that the increase in atmospheric CO_2 concentration might be beneficial to growth and photosynthesis of C. raciborskii, which may increase the risk of blooms.

关 键 词：拟柱胞藻 CO2 光合作用 无机碳 胞外碳酸酐酶 

分 类 号：Q948.11[生物学—植物学]