Effect of Adsorbed Cations on Phosphorus Uptake by Excised Roots
Year: 1969
Type: article
Abstract: Pretreatment of excised roots of Hordeum vulgare, Zea mays, and Glycine max with various salt solutions affected their subsequent rate of phosphorus absorption from 2 x 10(-5)m KH(2)PO(4). The rate of absorption was greatest for roots pretreated with trivalent cations, intermediate with divalent cations and lowest with monovalent cations. It appeared that the pretreatment involved a rapid exchange reaction at the root surface which was reversible. A 1 min pretreatment was effective for more than 20 min. The acceleration of phosphorus uptake by roots produced by polyvalent cations may be due partly or entirely to a greater reduction in the electrical potential at the root surface or within the pores of the negatively charged cell wall by polyvalent cations than by monovalent cations.
Source: PLANT PHYSIOLOGY
DOI: 10.1104/pp.44.5.697
Author: R. E. Franklin
Institution: The Ohio State University
Language: English
Subfield: Plant Science
Domain: Life Sciences
Open Access status: green
OpenAlex ID: W2055123742