title: Potassium Fluxes during Potassium Absorption by Intact Barley Plants of Increasing Potassium Content.
abstract: The presence of previously absorbed K in plants caused a marked reduction in the short term influx of (86)Rb-labeled K into roots of barley seedlings. The influx values agreed with net K absorption rates into intact plants, thus suggesting that K efflux was negligible in comparison with influx.Earlier interpretations of a large K efflux component from excised roots approaching equilibrium K concentrations are considered to be due to an underestimation of net K absorption rates resulting from xylem exudation as the K status of the roots increased.
authors.affiliation: Department of Soil Science and Plant Nutrition, Institute of Agriculture, University of Western Australia, Nedlands, Western Australia, 6009.
authors.forename: C
authors.initials: C
authors.lastname: Johansen
authors.forename: D G
authors.initials: DG
authors.lastname: Edwards
authors.forename: J F
authors.initials: JF
authors.lastname: Loneragan