title: Stimulation of ATPase activity by auxin is dependent on ATP concentration.
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.
authors.affiliation: Botanisches Institut der Universität, Venusbergweg 22, D-5300, Bonn, Federal Republic of Germany.
authors.forename: G F
authors.initials: GF
authors.lastname: Scherer