Measurements of starch breakdown as estimates of glycolysis during thermogenesis by the spadix of Arum maculatum L.

The rates of starch breakdown at thermogenesis by clubs of the spadices of Arum maculatum L. were measured in individual clubs still attached to the plants. The values obtained were used as estimates of the rate of glycolysis at thermogenesis. Such rates were shown to exceed the maximum catalytic activities of phosphofructokinase (E.C. 2.7.1.11.), aldolase (E.C. 4.1.2.7.), and glyceraldehydephosphate dehydrogenase (E.C. 1.2.1.12.) in developing clubs. The marked increases in the activities of the above enzymes that occur during the development of the club have been shown to be a prerequisite for the attainment of the high rate of glycolysis found at thermogenesis, and thus to be an example of coarse control of glycolysis.