Effect of Adsorbed Cations on Phosphorus Uptake by Excised Roots 1
AUTOR(ES)
Franklin, R. E.
RESUMO
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 × 10−5m KH2PO4. 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.
ACESSO AO ARTIGO
http://www.pubmedcentral.nih.gov/articlerender.fcgi?artid=396148Documentos Relacionados
- Calcium Uptake by Excised Maize Roots and Interactions With Alkali Cations 1
- Kinetics of Rb Absorption by Excised Barley Roots under Changing Rb Concentrations. I. Effects of Other Cations on Rb Uptake 1
- Effect of Ribonuclease on Salt Absorption by Excised Mung Bean Roots1
- Uptake of calcium by excised barley roots 12
- Effect of Sulfhydryl Inhibitors on Rubidium Absorption by Excised Mung Bean Roots. 1