Brassinosteroid-induced changes of plasmalemma energization and transport and of assimilate uptake by plant tissues
1991
Dahse, I. | Petzold, U. | Willmer, C.M. | Grimm, E.
Several steroids, among them 22S,23S-homobrassinolide (SSHB) and 24-epibrassinolide (24-E), were examined with respect to their effects on plasmalemma energization and assimilate uptake by measuring the electrical potential difference (PD) across the plasmalemma and medium acidification, stomatal opening and uptake of radioactive alpha-aminoisobutyric acid and sucrose using different plant material. All steroids tested cause, at least temporarily, hyperpolarization of the PD. No correlation of the ability to hyperpolarize the plasmalemma with known growth effects was found. The results are compatible with a steroid effect on the membrane-embedded moiety of the plasmalemma H+-ATPase. This does not seen to be the specific effect of brassinosteroids. However, both brassinosteroids promote solute uptake and inhibit stomatal opening.
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