Claim · model-written summary
2-4-Dinitrophenol (DNP), sodium azide, and vanadate markedly reduced the rapidity and the magnitude of voltage decrease accompanying increases in concentration of K+, Na+, or Mg++
- Taxon
- Avicennia germinans
Avicennia germinanst0 - Treatment
- 2-4-Dinitrophenol (DNP), sodium azide, and vanadatee0
- Outcome
- rapidity and the magnitude of voltage decreasee0
- Direction
- reducede0
Not reportedOrgan / stageComparator
Verbatim
t0“Avicennia germinans”
e0“2-4-Dinitrophenol (DNP), sodium azide, and vanadate markedly reduced the rapidity and the magnitude of voltage decrease accompanying increases in concentration of K+, Na+, or Mg++”
Title
Electrophysiology of the Salt Glands of Avicennia germinans
Ronald A. Balsamo; Michael E. Adams; William W. Thomson International Journal of Plant Sciences 1995. doi:10.1086/297288
Other claims from this paper (11)
- Intervention effect Increasing the concentrations of K+, Na+, or Mg++ in the bath medium decreased the measured transcellular voltage and resistance
- Intervention effect The velocity and magnitude of these transcellular depolarizations varied: K+ > Na+ > Mg++ >> Cl-
- Intervention effect Increasing the pH of the incubation medium from 5.5 to 7.0 reduced both the rate and the magnitude of voltage decrease when Na+ concentration was changed
- Intervention effect tissue incubated at pH 8.0 did not form secretion droplets
- Intervention effect Transcellular depolarizations resulting from concentration shifts of K+ from 10 to 100 mM were partially suppressed in the presence of La+++
- Intervention effect The voltage decrease accompanying changes in K+ concentration was partially blocked by tetraethyl ammonium chloride (TEA) but not in Na+
- Intervention effect Niflumic acid reduced the magnitude of the transcellular voltage with increased K+ concentration but did not affect the velocity
- Intervention effect Niflumic acid reduced the magnitude of the transcellular voltage with increased K+ concentration but did not affect the velocity
- Intervention effect The small voltage decrease accompanying changes in Cl- concentration was not affected by either TEA or niflumic acid (NA)
- Observation a considerable cation flux occurred across epidermal peels of A germinans in regions where there were salt glands
- Mechanism Salt secretion is best explained by a modified chemiosmotic hypothesis where cation channels and/or permeases work in concert with the electrochemical proton gradient generated by the plasma membrane H+/ATPase