Abscisic Acid-related changes in composition and physical state of membranes in bean leaves

Copyright © 1985 Gustav Fischer Verlag, Stuttgart. Published by Elsevier GmbH.. All rights reserved.

Bibliographische Detailangaben
Veröffentlicht in:Journal of plant physiology. - 1979. - 118(1985), 4 vom: 01. März, Seite 373-9
1. Verfasser: Farkas, T (VerfasserIn)
Weitere Verfasser: Singh, B, Nemecz, G
Format: Online-Aufsatz
Sprache:English
Veröffentlicht: 1985
Zugriff auf das übergeordnete Werk:Journal of plant physiology
Schlagworte:Journal Article
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520 |a Leaf discs of bean, maize, and wheat were incubated in the presence of either 2-(14)C mevalonic acid or methyl-(14)C choline chloride and varying concentrations of abscisic acid. Abscisic acid inhibited, dependent on concentration, the incorporation of mevalonate into free sterols and stimulated the incorporation of choline chloride into phosphatidylcholine. As a result the dpm ratio of free sterols to phosphatidylcholine decreased. Untreated bean leaf membranes exhibited phase separation temperatures at around 17 and 9°C using the TEMPO in vivo spin labelling technique. Both the upper and lower phase separation temperatures were shifted to lower temperatures in chill, or water stressed plants. Administration of abscisic acid brought about corre-sponding changes in phase behaviour of leaf membranes. It is suggested that beneficial effect of the hormone on chill tolerance of plants manifests itself, at least partially, thorough the modification of the physical state of membranes 
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