Über den Zusammenhang von Photophosphorylierung und aktiver lonenaufnahme

Abstract

Active ion absorption, Adenosine tri-phosphate (ATP) level, and ATP formation in Limnophila leaves under different conditions were compared. All 3 were diminished in light+N2 (in comparison to light+air on darkness+air), but were higher than in darkness+N2. It is probable, but not absolutely proven by experiments of this kind alone, that the ATP formed in the chloroplasts can be used for the operation of active (endergonic) ion absorption. The increase in active ion absorption obtained in CO2-free air by long continued lighting may possibly be explained by a higher concentration of a transport enzyme attained in light because of increased sulfate reduction. The incorporation of radioactive phosphate into phospholipids was not promoted by light.