α-Amylase in the Barley Grain Influenced by the Auxin-Cytokinin Interaction in the Coleoptile |
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| Authors: | RITA VERBEEK H A VAN ONCKELEN TH GASPAR |
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| Institution: | Laboratorium voor Algemene en Biologische Scheikunde, University of Ghent, B-9000 Belgium and (Th. G.) Institute Van Beneden, University of Liège, B-4000 Belgium |
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| Abstract: | Two phases are distinguished in the α-amylase production in barley (Hordeum vulgare) grains. There is an increase in activity extended to the third or fourth day of germination, then a slight decrease follows. This decrease is accelerated by kinetin while it is prevented by IAA applied at the top of the embryo coleoptile. IAA reverses partially the kinetin action. IAA applied in the germination medium has practically no effect. Removal of the coleoptile stops further increase in α-amylase activity and induces complete insensitivity to hormone treatment. The results indicate that auxin metabolism in the coleoptile participates in the control of α-amylase evolution in the barley grain and that kinetin could act through auxin metabolism in this coleoptile. |
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