Stimulation of ATPase activity by auxin is dependent on ATP concentration

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 mo...

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Veröffentlicht in:	Planta 1984-07, Vol.161 (5), p.394-397
1. Verfasser:	Scherer, G.F.E
Format:	Artikel
Sprache:	eng
Schlagworte:	Adenosine triphosphatases Agronomy. Soil science and plant productions Auxins Biological and medical sciences Cell membranes Chemical agents Coleoptiles Economic plant physiology Enzymes Fundamental and applied biological sciences. Psychology Growth and development Growth regulators Hormones Hypocotyls Plant physiology and development Plant roots Plants pumpkins Sodium Vegetative apparatus, growth and morphogenesis. Senescence
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Zusammenfassung:	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.
ISSN:	0032-0935 1432-2048
DOI:	10.1007/BF00394568