title: Active H Efflux from Cells of Low-salt Barley Roots during Salt Accumulation.
abstract: Measurements were made of net H(+) loss from low-salt barley roots accumulating salt. Comparison of rates of loss from roots in different concentrations of KCl showed that H(+) loss increased in the same way as the Mechanism II component of salt uptake. This H(+) loss appeared to be coupled to salt uptake and was not due to increased respiration or metabolic breakdown of sugars. In view of the large negative potential of the cells (-60 millivolts), it is suggested that the H(+) loss is due to an outward proton transport process.
authors.affiliation: Mineral Nutrition Laboratory, United States Department of Agriculture, Agricultural Research Service, Beltsville, Maryland 20705.
authors.forename: M G
authors.initials: MG
authors.lastname: Pitman