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Ethylene metabolism in Pisum sativum L. : Kinetic parameters, the effects of propylene, silver and carbon dioxide and comparison with other systems

Evans, David E and Smith, Aileen R and Taylor, Jane and Halo, Michael A (1984) Ethylene metabolism in Pisum sativum L. : Kinetic parameters, the effects of propylene, silver and carbon dioxide and comparison with other systems. Plant Growth Regulation, 2 (3). pp. 187-195. ISSN 0167-6903

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Abstract

The kinetic parameters of in vivo ethylene metabolism by seedlings of Pisum sativum L. cv. Alaska have been determined. The oxidation of ethylene to CO2, (Ox) and the incorporation of ethylene into the tissue (TI) were both shown to display Michaelis-Menten kinetics (Km Ox = 0.9 × 10–6 M liquid phase, Vmax Ox = 2.4 × 10–10 moles g– dry mass h–1 Km TI = 1.6 × 10–6 M liquid phase, Vmax TI = 4.5 × 10–10 moles g–1 dry mass h–1). Propylene competitively inhibited both Ox (Ki = 7.0 × 10–6 M) and TI (Ki = 3.7 × 10–7 M). A system comparable to Ox was absent from imbibed cotyledons of Vicia faba L. cv. Aquadulce even at saturating concentrations of ethylene similar to those used in kinetic analysis on Pisum. Silver ions were shown to inhibit TI but promoted Ox, while carbon dioxide inhibited Ox but promoted TI. Kinetic data on both these effects are presented. Data on the effect of a range of concentrations of CO2 on TI and Ox are also presented.

Item Type: Article
Journal or Publication Title: Plant Growth Regulation
Uncontrolled Keywords: Propylene ; Ethylene metabolism ; Silver ; Carbon dioxide ; Pisum sativum
Subjects: UNSPECIFIED
Departments: Faculty of Science and Technology > Lancaster Environment Centre
ID Code: 52482
Deposited By: ep_importer_pure
Deposited On: 08 Feb 2012 11:55
Refereed?: Yes
Published?: Published
Last Modified: 09 Apr 2014 23:04
Identification Number:
URI: http://eprints.lancs.ac.uk/id/eprint/52482

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