Kinetics and Energetics of Light-enhanced Potassium Absorption by Corn Leaf Tissue
- 1 March 1968
- journal article
- Published by Oxford University Press (OUP) in Plant Physiology
- Vol. 43 (3) , 394-400
- https://doi.org/10.1104/pp.43.3.394
Abstract
The effect of illumination on the absorption of K+ by leaf tissue of Zea mays was investigated. The rate of K+ absorption was enhanced by exposure of slices of corn leaf tissue to light, even of relatively low intensities. Potassium was transported inward, with virtually no efflux of previously accumulated K+. The evidence indicates that the transport mechanism for absorption of K+ is the same in the light as in the dark, but that the source of energy for absorption of K+ is different in the light from that in the dark. Various anti-metabolites were used to establish that the energy utilized for active ion transport in the light came partly from ATP supplied by cyclic photophosphorylation. Expenditure of ATP was required in the dark too, but this ATP was formed by oxidative phosphorylation. Establishing the ultimate source of energy for active ion uptake by higher plants might be facilitated by demonstration of an ion-transport process that is not linked directly with the transfer of electrons in the mitochondrial cytochrome chain.Keywords
This publication has 19 references indexed in Scilit:
- Sodium Absorption by Barley Roots: Role of the Dual Mechanisms of Alkali Cation TransportPlant Physiology, 1967
- Removal of Salt from Xylem Sap by Leaves and Stems of Guttating PlantsPlant Physiology, 1966
- Effect of Oxygen on Photosynthesis, Photorespiration and Respiration in Detached Leaves. II. Corn and other MonocotyledonsPlant Physiology, 1966
- PhotosynthesisAnnual Review of Biochemistry, 1965
- The nature of the coupling between light energy and active ion transport in Nitella translucensBiochimica et Biophysica Acta (BBA) - Biophysics including Photosynthesis, 1964
- Ion Absorption by Shoot Tissue: Kinetics of Potassium and Rubidium Absorption by Corn Leaf TissuePlant Physiology, 1964
- Energy-dependent ion uptake in spinach chloroplastsBiochimica et Biophysica Acta (BBA) - Specialized Section on Biophysical Subjects, 1964
- Ion Absorption by Shoot Tissue: Technique and First Findings with Excised Leaf Tissue of CornPlant Physiology, 1964
- RESOLUTION OF DUAL MECHANISMS OF POTASSIUM ABSORPTION BY BARLEY ROOTSProceedings of the National Academy of Sciences, 1963
- The essential role of calcium in selective cation transport by plant cellsPlant Physiology, 1961