RESOLUTION OF DUAL MECHANISMS OF POTASSIUM ABSORPTION BY BARLEY ROOTS
- 1 May 1963
- journal article
- research article
- Published by Proceedings of the National Academy of Sciences in Proceedings of the National Academy of Sciences
- Vol. 49 (5) , 684-692
- https://doi.org/10.1073/pnas.49.5.684
Abstract
The relationship between the rates of absorption of K and Rb by barley roots and the concentration of these ions in the external solution, over the range 0.002-50 m[image], is predictable on the assumption that 2 carrier sites bind and transport the ions. One of these operates at half-maximal velocity at a concentration of about 0. 018 m[image], with very low affinity for Na; the 2nd , at about 16 m[image], with severe competition by Na. The latter but not the former mechanism is inhibited when SO4 is the anion instead of Cl.This publication has 10 references indexed in Scilit:
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