The Membrane Potential as Indicator for Transport and Energetic Processes of Leaf Cells of the Aquatic Plant Egeria densa

Dahse, I.; Müller, Eberhard; Liebermann, Bernd; Eichhorn, M.

doi:10.1016/s0015-3796(88)80070-2

Cited by 8 publications

(1 citation statement)

References 15 publications

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“…In order to characterize further the role of the steroid structure in modifying transport on the cellular level, we here describe the effects of another potent synthetic analog, SSHB (1 in Fig. 1), on the membrane potential and on proton and solute transport of Egeria densa, a submerged aquatic weed well characterized in this respect (5,6,12), and we compare the SSHB effect with those induced by related substances and FC.…”

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confidence: 99%

Effects of (22S,23S)-Homobrassinolide and Related Compounds on Membrane Potential and Transport of Egeria Leaf Cells

Dahse¹,

Sack²,

Bernstein³

et al. 1990

Plant Physiol.

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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, 2a-3a-dihydroxy-5a-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 a-aminoisobutyric acid. The results are compatible with a stimulation of an electrogenic proton pump mechanism at the plasmalemma by (22S,23S)-homobrassinolide.behavior to auxin in corn roots (14) suggests an FC3-like mechanism of action for this compound. Unfortunately, the structural requirements of the steroid backbone, responsible for the stimulation of transport by brassinosteroids, is not yet clear, although some work was dedicated to this issue (10). In order to characterize further the role of the steroid structure in modifying transport on the cellular level, we here describe the effects of another potent synthetic analog, SSHB (1 in Fig. 1), on the membrane potential and on proton and solute transport of Egeria densa, a submerged aquatic weed well characterized in this respect (5, 6, 12), and we compare the SSHB effect with those induced by related substances and FC. MATERIALS AND METHODS Plant CultivationBrassinosteroids are a new class of growth regulators found in many plants (1, 10). Among them brassinolide, (22R,23R,24S)-2a,3a,22,23-tetrahydroxy-24-methyl-Bhomo-7-oxa-5a-cholestan-6-one, is the best characterized and causes the highest growth promotion. The comparison with other plant hormones in a series of bioassays revealed auxinlike properties, albeit a powerful synergism between brassinolide and IAA was reported (1 1, 15

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confidence: 99%

Effects of (22S,23S)-Homobrassinolide and Related Compounds on Membrane Potential and Transport of Egeria Leaf Cells

Dahse¹,

Sack²,

Bernstein³

et al. 1990

Plant Physiol.

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Dihydrotentoxin: A precursor of tentoxin or its degradation product?

Liebermann

Ihn²

1988

J. Basic Microbiol.

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Besides tentoxin, dihydrotentoxin is produced by Alternaria alternata in similar quantities. Both peptides are excreted mainly into theculturemedium, with a low content (20-55 pg/g) being found in themycelium already of an early stage of fermentation. Tentoxin is not degraded during cultivation, therefore, dihydrotentoxin cannot be a decomposition product of the phytotoxin. During the isolation procedure, some tentoxin (10 to 15 %) and even more dihydrotentoxin (30-40 %) is lost. Incorporation of labelled dihydrotentoxin (14C, 15N) into tentoxin during fermentation allows the conclusion that the nonoxidized peptide is the precusor of tentoxin.

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The Plant Membrane and Its Response to Disease

Novacký

1991

The Fungal Spore and Disease Initiation in Plants and Animals

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The Membrane Potential as Indicator for Transport and Energetic Processes of Leaf Cells of the Aquatic Plant Egeria densa

Cited by 8 publications

References 15 publications

Effects of (22S,23S)-Homobrassinolide and Related Compounds on Membrane Potential and Transport of Egeria Leaf Cells

Effects of (22S,23S)-Homobrassinolide and Related Compounds on Membrane Potential and Transport of Egeria Leaf Cells

Dihydrotentoxin: A precursor of tentoxin or its degradation product?

The Plant Membrane and Its Response to Disease

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