丝藻光合作用无机碳利用研究

Studies on Photosynthetic Inorganic Carbon Utilization of Ulothrix sp_.

摘要: 丝藻pH补偿点为9.2,表明其具有较低的CO₂补偿点;不同pH值下丝藻光合作用放氧速率明显大于理论上从HCO-3脱水来的CO₂供应速率,表明其具有利用HCO₂^-的能力;未检测到丝藻有胞外碳酸酐酶活性,胞内碳酸酐酶的活性随培养液中CO₂浓度的升高而降低。

Abstract: Photosynthetic inorganic carbon utilization of Ulothrix sp.had been investigated.The results showed that pHcompensation point of Ulothrix sp.was 9.2,which suggested lower CO₂ compensation point in Ulothrix sp.Photosynthetic O₂ evolution was higher than theoretical CO₂ supply rate from HCO₃^- dehydration in different pH,which implied Ulothrix sp.can utilize HCO₃^-.Extracellular CAactivity of Ulothrix sp.was not found,but intracellular CAactivity was decreased with increased CO₂ levels.