Plant Physiology 56:377-380 (1975)
© 1975 American Society of Plant Biologists
Articles
The Regulation of Potassium Absorption in Barley Roots
Anthony Glass
Department of Botany and Zoology, Massey University, Palmerston North, New Zealand
The dynamics of changes in K+ influx across the plasmalemma and of internal K+ concentrations [K+]1 of intact barley (Hordeum vulgare) roots were examined as the roots were converted from `high-salt' to `low-salt' roots. Following the transfer of plants grown in 0.5 mM CaSO4 solutions plus various concentrations of KCl to 0.5 mM CaSO4 solutions, influx rates increased and internal K+ concentrations declined as a function of time and the initial K+ status of the tissue. The relationship between plasmalemma influx and [K+]1 was examined over a wide range of [K+]1 values by growing intact plants in various concentrations of KCl. Plasmalemma influx was inversely correlated with the square of [K+]1. A model for the regulation of plasmalemma influx by [K+]1 is considered.
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