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Plant Physiology 51:146-149 (1973)
© 1973 American Society of Plant Biologists

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Articles

Hormonal Control of Isoperoxidases in Lentil Embryonic Axis 1

Thomas Gaspar, Anwar A. Khan and Danielle Fries2

Department of General Biology, Institute Van Beneden, University of Liège, Belgium, New York State Agricultural Experiment Station, Cornell University, Geneva, New York 14456

Detachment of the cotyledons from the lentil (Lens culinaris Med.) embryonic axis causes in the latter an increase in total peroxidase activity which is shown to be due to enhancement of specific cathodic isoperoxidases. Kinetin treatment of attached or detached axes promotes activity of essentially the same cathodic isoperoxidases. In addition kinetin enhances the activity of two anodic peroxidases and represses specifically that of a cathodic one. Abscisic acid inhibits the production of all isoenzymes in the presence or absence of kinetin. Cytokinin and abscisic acid actions are discussed in relation to the nature of a wounding hormone and the role of natural inhibitors in cotyledons during germination. Indoleacetic acid stimulates the activity of certain isoenzymes which are also stimulated by kinetin, whereas in others the effects of the two hormones are different. Specific inverse effects of indoleacetic acid and kinetin are demonstrated on the two most cathodic isoperoxidases. Indoleacetic acid-kinetin interactions on the cathodic isoperoxidases have been found in the literature and are discussed as a possible mechanism for explaining interactions of the two regulators on growth and other physiological processes.

2 On leave from the University of Brussels.

1 Supported by the Belgian Fonds de la Recherche Fondamentale Collective Grant 998, the National Science Foundation Grant GB-30355, and the American Seed Research Foundation.






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