Abstract: | Oxygen at pressures of 2 and 3 atmospheres caused an initialincrease in CO2 output of strawberry leaves followed by a decrease.In oxygen at 2 atmospheres, but not in oxygen at 3 atmospheres,the increase in CO2 output could be attributed to an increasein glucose-6-phosphate and in fructose diphosphate; in oxygenat 3 atmospheres the increase may be due to an increased accessibilityof substrates and enzymes or to other causes. The decline inCO2 output in oxygen at both 2 and 3 atmospheres was associatedwith large decreases in glucose-6-phosphate and 3-phosphoglycerate,probably due to a large decrease in adenosine triphosphate relatedto a block of the tricarboxylic acid cycle. |