Regulation of arginine decarboxylase and putrescine levels in Cucumis sativus cotyledons

Rangarajan, Suresh M and Ramakrishna, Seethala and Adiga, Radhakantha P (1978) Regulation of arginine decarboxylase and putrescine levels in Cucumis sativus cotyledons. In: Phytochemistry, 17 (1). pp. 57-63.

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Abstract

Arginine decarboxylase (arginine carboxy-lyase EC 4.1.1.19) of Cucumis sativus cotyledons, has a pH optimum of 8.3 and a temperature optimum of 40°. Among the various plant hormones administered to excised cotyledons in culture, benzyladenine and its riboside were most effective in increasing the arginine decarboxylase activity and putrescine content. The enzyme activity and putrescine content were significantly increased on acid feeding of the cotyledons and decreased by KCl treatment. The KCl effect could be only partially reversed by benzyladenine. Abscisic acid inhibited cotyledon growth and also reduced arginine decarboxylase and putrescine levels. This effect was overcome by cytokinins. The half life of the enzyme using cycloheximide was 3.7 hr. Dibutyryl cyclic AMP and 5′-AMP also marginally stimulated the enzyme and putrescine levels. Mixing experiments indicate that there is neither a non-dialysable activator nor inhibitor of the enzyme.

Item Type:	Journal Article
Publication:	Phytochemistry
Publisher:	Elsevier Science
Additional Information:	Copyright of this article belongs to Elsevier Science.
Department/Centre:	Division of Biological Sciences > Biochemistry
Date Deposited:	18 Dec 2009 07:42
Last Modified:	01 Mar 2012 08:31
URI:	http://eprints.iisc.ac.in/id/eprint/24097

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