Active H Efflux from Cells of Low-salt Barley Roots during Salt Accumulation |
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| Authors: | Pitman M G |
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| Affiliation: | Mineral Nutrition Laboratory, United States Department of Agriculture, Agricultural Research Service, Beltsville, Maryland 20705. |
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| 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. |
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