Proton-Metal Cation Exchange in the Cell Wall of Nitella flexilis
Open Access
- 1 November 1983
- journal article
- Published by Oxford University Press (OUP) in Plant Physiology
- Vol. 73 (3) , 865-867
- https://doi.org/10.1104/pp.73.3.865
Abstract
When protons are exchanging for bivalent cations (Cu2+, Zn2+, or Ca2+) on the carboxylic groups of Nitella flexilis cell wall, the values of the respective global equilibrium constants do not change up to a protonation degree of 80%. These values drastically increase at higher proton concentrations and tend to ≃3.4, which is the intrinsic pK value of the constitutive α-d-galacturonic acid monomer. These data suggest that the electric field in the matricial polymer and the cation bridges between pairs of negative sites have disappeared.Keywords
This publication has 6 references indexed in Scilit:
- H+ Uptake and Extrusion by Nitella clavataPlant Physiology, 1982
- Isolation of Functionally Intact Rhodoplasts from Griffithsia monilis (Ceramiaceae, Rhodophyta)Plant Physiology, 1981
- Evidence that Auxin-induced Growth of Soybean Hypocotyls Involves Proton ExcretionPlant Physiology, 1980
- Cell Expansion Patterns and Directionality of Wall Mechanical Properties in Nitella.Plant Physiology, 1980
- Titration of Isolated Cell Walls of Lemna minor LPlant Physiology, 1979
- Polysaccharides of the characeae III. The carbohydrate content of Chara australisBiochimica et Biophysica Acta, 1961