Department of Biology, Queen's University, Kingston, Ontario, Canada K7L 3N6.
Plant Physiol. 1988 Jul;87(3):551-4. doi: 10.1104/pp.87.3.551.
A mass spectrometer was used to simultaneously follow the time course of photosynthetic O(2) evolution and CO(2) depletion of the medium by cells of the cyanobacterium Synechococcus leopoliensis UTEX 625. Analysis of the data indicated that both CO(2) and HCO(3) (-) were simultaneously and continuously transported by the cells as a source of substrate for photosynthesis. Initiation of HCO(3) (-) transport by Na(+) addition had no effect on ongoing CO(2) transport. This result is interpreted to indicate that the CO(2) and HCO(3) (-) transport systems are separate and distinctly different transport systems. Measurement of CO(2)-dependent photosynthesis indicated that CO(2) uptake involved active transport and that diffusion played only a minor role in CO(2) acquisition in cyanobacteria.
一台质谱仪被用于同步追踪蓝藻集胞藻 UTEX 625 细胞的光合 O(2) 演变和培养基中 CO(2) 消耗的时程。数据分析表明,细胞同时并持续地将 CO(2) 和 HCO(3)(-)作为光合作用的基质进行转运。Na(+) 添加启动 HCO(3)(-) 转运对正在进行的 CO(2) 转运没有影响。这一结果被解释为表明 CO(2) 和 HCO(3)(-) 转运系统是独立且截然不同的转运系统。对 CO(2) 依赖性光合作用的测量表明,CO(2) 摄取涉及主动转运,而扩散在蓝藻中 CO(2) 获得过程中仅发挥次要作用。