Abstract
The CO
2
output of potatoes held at 15 °C in oxygen at a pressure of either 2 or 3 atm was first decreased, then increased and finally again decreased. The increase of CO
2
output was much larger than in carrots (Barker 1961); in oxygen at a pressure of 2 atm the rate of CO
2
output of potatoes was increased 4.6 fold; taking into account the accumulation of citrate, the ‘total carbon traffic’ was increased 5.6 fold in oxygen. This increase was believed to occur mainly in a pathway which was not the tricarboxylic acid cycle. As in potatoes held at 1 °C in an atmosphere of oxygen (Barker & Mapson 1955), citrate accumulated and
α
-ketoglutarate decreased in potatoes, held at 15 °C in oxygen at pressures of 2 or 3 atm; these changes were accepted as demonstrating the occurrence of the tri-carboxylic acid cycle. The final decrease of CO
2
output in oxygen appeared not to be related to the occurrence of ‘blocks’ either between citrate and
α
-ketoglutarate or of pyruvate or
α
-ketoglutarate oxidases; the inhibition might be due to a shortage of sugar phosphate substrates, caused possibly by oxygen inhibition of cytochrome-
c
reductase. The outburst of CO
2
, which occurred in potatoes first held in oxygen and then returned to air, could not be attributed solely to oxidation of accumulated citrate.
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1. POTATO RESPIRATION: ELECTRON TRANSPORT PATHWAYS;Potato Physiology;1985
2. Nature and Control of Respiratory Pathways in Plants: The Interaction of Cyanide-Resistant Respiration with the Cyanide-Sensitive Pathway**Abbreviations: SHAM, salicylhydroxamic acid; CLAM, m-chlorobenzhydroxamic acid; BSA, bovine serum albumin; RCR, respiratory control ratio; FPma, medium potential, absorbing (i.e., nonfluorescent) flavoprotein; pmf, proton motive force; TCA cycle, tricarboxylic acid cycle.;Metabolism and Respiration;1980
3. John Barker, 1901-1970;Biographical Memoirs of Fellows of the Royal Society;1972-11
4. α-Oxidation of endogenous fatty acids in fresh potato slices;Phytochemistry;1972-01
5. Cellular mechanisms of oxygen toxicity.;Physiological Reviews;1968-04