Stimulation of ATPase activity by auxin is dependent on ATP concentration |
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| Authors: | Günther F E Scherer |
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| Institution: | (1) Botanisches Institut der Universität, Venusbergweg 22, D-5300 Bonn, Federal Republic of Germany |
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| Abstract: | The effect of auxin on membrane-bound ATPase activity was studied in a plasma membrane-enriched fraction from zucchini hypocotyls. The apparent KM of ATPase activity for ATP was decreased in the presence of 10-6 M auxin so that at very low ATP concentrations the stimulation of ATPase activity was most obvious. The weak auxin analogue, 2,3-dichlorophenoxyacetic acid, stimulated much less than the active auxin 2,4-dichlorophenoxyacetic acid. |
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| Keywords: | Acid growth theory ATPase Auxin (action mechanism) Cucurbita |
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