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Effects of (22S,23S)-Homobrassinolide and Related Compounds on Membrane Potential and Transport of Egeria Leaf Cells.
Dahse, I; Sack, H; Bernstein, M; Petzold, U; Müller, E; Vorbrodt, H M; Adam, G.
Affiliation
  • Dahse I; Wissenschaftsbereich Biophysik, Sektion Biologie, Friedrich-Schiller-Universität Jena, Philosophenweg 14a, 6900 Jena, German Democratic Republic.
Plant Physiol ; 93(3): 1268-71, 1990 Jul.
Article in En | MEDLINE | ID: mdl-16667589
ABSTRACT
(22S,23S)-Homobrassinolide was tested for its effect on the electric cell potential, proton extrusion, ferricyanide reduction, and amino acid and sucrose uptake of leaves of Egeria densa Planchon. In the light, (22S,23S)-homobrassinolide and its derivative, 2alpha-3alpha-dihydroxy-5alpha-stigmast-22-en-6-one, were similar to each other and similar to fusicoccin in causing hyperpolarization and proton extrusion, whereas stigmasterol was less effective. In darkness, the three sterols showed comparable effects. (22S,23S)-Homobrassinolide slightly stimulated ferricyanide reduction and promoted uptake of sucrose and alpha-aminoisobutyric acid. The results are compatible with a stimulation of an electrogenic proton pump mechanism at the plasmalemma by (22S,23S)-homobrassinolide.

Full text: 1 Collection: 01-internacional Database: MEDLINE Language: En Journal: Plant Physiol Year: 1990 Document type: Article

Full text: 1 Collection: 01-internacional Database: MEDLINE Language: En Journal: Plant Physiol Year: 1990 Document type: Article