Aeration of submersed corn roots doubles the subsequent uptake rate of ions. Potassium uptake (86Rb) by excised and intact roots before and after augmentation was measured, and potassium losses by roots at different temperatures or in the presence of dinitrophenol was followed. Relevant effluxes of potassium follow excision and/or submersion of roots, and a metabolism-dependent process must be carried out by roots in order to recover the control of membrane permeability. Moreover, we show that corn hybrids of different maturity classes differ not only for initial uptake rate but also for the ability to recover control of membrane permeability.
Potassium flux in Corn roots during augmentation of ion uptake
VARANINI, Zeno;
1987-01-01
Abstract
Aeration of submersed corn roots doubles the subsequent uptake rate of ions. Potassium uptake (86Rb) by excised and intact roots before and after augmentation was measured, and potassium losses by roots at different temperatures or in the presence of dinitrophenol was followed. Relevant effluxes of potassium follow excision and/or submersion of roots, and a metabolism-dependent process must be carried out by roots in order to recover the control of membrane permeability. Moreover, we show that corn hybrids of different maturity classes differ not only for initial uptake rate but also for the ability to recover control of membrane permeability.
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