-
Views
-
Cite
Cite
Toshihiko Abe, Mikio Tsuzuki, Shigetoh Miyachi, Transport and Fixation of Inorganic Carbon during Photosynthesis of Anabaena Grown under Ordinary Air. I. Active Species of Inorganic Carbon Utilized for Photosynthesis, Plant and Cell Physiology, Volume 28, Issue 2, March 1987, Pages 273–281, https://doi.org/10.1093/oxfordjournals.pcp.a077293
Close - Share Icon Share
Abstract
Inorganic carbon transport during photosynthesis of cyanobacterium Anabaena variabilis grown under ordinary air was investigated by supplying 14CO2 or H14CO3− solution to three different strains. Both CO2 and HCO3− were accumulated within the algal cells. In the cell suspension from which dissolved inorganic carbon had been depleted by pre-illumination, CO2 was transported and accumulated faster than HCO3−. When the concentration of HCO3− injected into the cell suspension of A. variabilis M3 was 25 times as high as that of CO2 (the expected ratio at equilibrium at pH 7.8), the initial rates of fixation of both inorganic carbon species were practically the same. On the other hand, when 14CO2 or H14CO3− was added under steady state photosynthetic conditions, both carbon species were transported at similar rates. The ratio of fixed to transported carbon measured after the initial 5 s was only 23–27% regardless of the carbon species supplied. This percentage is much lower than that reported for Chlorella cells.
