Tetcyclacis and Abscisic Acid-Sensitive Reduction of Extracellular Ferricyanide by Mesophyll Cells ofValerianella locustaandLemna gibba
- 1 January 1993
- journal article
- research article
- Published by Oxford University Press (OUP) in Journal of Experimental Botany
- Vol. 44 (1) , 35-39
- https://doi.org/10.1093/jxb/44.1.35
Abstract
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.Keywords
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