STUDIES IN RESPIRATORY AND CARBOHYDRATE METABOLISM OF PLANT TISSUES .25. CHANGES IN RATE OF CO2 OUTPUT AND IN CONTENT OF VARIOUS PHOSPHATE COMPOUNDS IN POTATOES

The changes of various phosphate compounds were determined during the increase in rate of CO2 output and of sugar content which occurred in low‐sugar potatoes at 1° C. The contents of phosphate compounds were also estimated in high‐ and low‐sugar potatoes at 10° C. The increase in rate of CO2 output associated with higher sugar content could not be attributed wholly to an increase in the amounts of the hexose mono‐ and di‐phosphates; possible explanations are given. The changes observed in glucose‐1‐phosphate do not afford any explanation of the mechanism of sweetening and de‐sweetening in potatoes. In different metabolic data the quotient, glucose‐1‐phosphate/glucose‐6‐phosphate, remained close to that for phosphoglucomutase in vitro. Copyright © 1968, Wiley Blackwell. All rights reserved