Differential effect of dio-9 on non-cyclic photophosphorylation and14C-fixation in vivo

Photophosphorylation In Vivo

“…The question of whether high-energy intermediates instead of ATP may be used directly for CO2 assimilation in vivo, which has been concluded from experiments especially with phloridzin and Dio-9 in vitro (262) and in vivo (64,173,178,252), is still unanswered. But it has to be considered that these inhibitors could show an additional effect possibly on the transport ATPase in cellular membranes (98, 173,178).…”

Inhibitor effects on photosynthesis, respiration and active ion transport inHydrodictyon africanum

“…Alternative (3) proposes that an alternative ATP source, stored polyphosphate, is used when ATP synthesis from photophosphorylation is blocked by energy-transfer inhibitors Gimmler, Urbach & Simonis, 1969). Despite the short experimental times used by these workers, the amount of polyphosphate in the Ankistrodesmus cell (Kanai & Simonis, 1968) would be almost entirely used up in their experiments with phlorizin or Dio-9 if the photosynthetic rate was that measured by Jeschke, Gimmler, and Simonis (1967), with an ATP/CO2 ratio of 3.…”