Abstract
The effect of tris, choline, and ethanolamine chlorides on the activity of Mg2+-dependent ATPase in membrane fractions (cell walls, mitochondria, and microsomes) of Zea mays L. (cv. Neve Yaar 22), Avena sativa L. (cv. Mulga), and Hordeum vulgare L. (cv. Omer) was compared with the effect of KC1 and NaCl. Considerable salt effects on apparent Mg2+-ATPase activity were found only at relatively high pH values (8-2) at which Mg2+-ATPase activity was low in the absence of monovalent cation salts. The Mg2+-dependent ATP hydrolysis by ATPases from all the membrane fractions increased in the presence of at least one of the organic cations to the same extent as in the presence of KC1 or NaCl. The monovalent organic cations are only very slowly absorbed by corn roots in comparison with K+ and Na+. It is concluded that monovalent salt effects on ATPase from these plant roots are not cation specific and not related to the capability of root cells to absorb cations. Present evidence for the existence of a cation-transport ATPase in plant tissue is critically reviewed.
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