Tetcyclacis and Abscisic Acid-Sensitive Reduction of Extracellular Ferricyanide by Mesophyll Cells of Valerianella locusta and Lemna gibba

Electron transport across the plasma membrane of Valerianella locusta mesophyll cells and intact fronds of Lemna gibba, induced by 10−3 M ferricyanide, was inhibited by tetcyclacis, an inhibitor regarded to be specific for cytochrome P-450 mono-oxygenases. The effect was dependent on the concentrati...

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Published in:Journal of experimental botany 1993-01, Vol.44 (1), p.35-39
Main Authors: BETZ, CHRISTOPH, ULLRICH, CORNELIA I., HARTUNG, WOLFRAM
Format: Article
Language:English
Subjects:
Abscisic acid
Agronomy. Soil science and plant productions
Biological and medical sciences
Cell membranes
Cell physiology
cytochrome P-450 mono-oxygenase
Cytochromes
Fundamental and applied biological sciences. Psychology
Leaves
Mesophyll cells
Physiology
Plant biochemistry
Plant cells
Plant physiology and development
Plants
plasma membrane
Plasma membrane and permeation
Potassium
Sodium
tetcyclacis
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creator BETZ, CHRISTOPH
ULLRICH, CORNELIA I.
HARTUNG, WOLFRAM
description Electron transport across the plasma membrane of Valerianella locusta mesophyll cells and intact fronds of Lemna gibba, induced by 10−3 M ferricyanide, was inhibited by tetcyclacis, an inhibitor regarded to be specific for cytochrome P-450 mono-oxygenases. The effect was dependent on the concentration of tetcyclacis and the duration of preincubation. The apparent rate of trans-membrane electron transport increased in the presence of catalase, indicating tetcyclacis-induced H2O2-production or additional tetcyclacis-independent H2O2 release. The findings suggest an interaction of cytochrome P-450 with the plasma membrane-located electron transport chain. This redox-chain could be involved in the degradation of abscisic acid, being located at the plasma membrane. This assumption is supported by the finding that ABA inhibits extracellular ferricyanide reduction.
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source JSTOR Archival Journals and Primary Sources Collection; Oxford University Press Archive
subjects Abscisic acid
Agronomy. Soil science and plant productions
Biological and medical sciences
Cell membranes
Cell physiology
cytochrome P-450 mono-oxygenase
Cytochromes
Fundamental and applied biological sciences. Psychology
Leaves
Mesophyll cells
Physiology
Plant biochemistry
Plant cells
Plant physiology and development
Plants
plasma membrane
Plasma membrane and permeation
Potassium
Sodium
tetcyclacis
title Tetcyclacis and Abscisic Acid-Sensitive Reduction of Extracellular Ferricyanide by Mesophyll Cells of Valerianella locusta and Lemna gibba
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