Abstract
Microelectrode techniques were used on epidermal peels of Avicennia germinans to characterize functional aspects of secretion in salt glands. Increasing the concentrations of K+, Na+, or Mg++ in the bath medium decreased the measured transcellular voltage and resistance. The velocity and magnitude of these transcellular depolarizations varied: K+ > Na+ > Mg++ >> Cl-. 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; tissue incubated at pH 8.0 did not form secretion droplets. Transcellular depolarizations resulting from concentration shifts of K+ from 10 to 100 mM were partially suppressed in the presence of La+++. The voltage decrease accompanying changes in K+ concentration was partially blocked by tetraethyl ammonium chloride (TEA) but not in Na+. Niflumic acid reduced the magnitude of the transcellular voltage with increased K+ concentration but did not affect the velocity. The small voltage decrease accompanying changes in Cl- concentration was not affected by either TEA or niflumic acid (NA). 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++. Ion concentrations in secretion droplets indicated that a considerable cation flux occurred across epidermal peels of A germinans in regions where there were salt glands. 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.
Abstract from the paper’s OpenAlex record, shown for indexing and research. Copyright remains with the authors or the publisher. Read at the source ↗
The text the model read, with the source record’s inline markup (italics, sub- and superscripts) rendered and its character entities decoded; quote offsets refer to the raw text.
Claims 12
Claim · model-written summary
Increasing the concentrations of K+, Na+, or Mg++ in the bath medium decreased the measured transcellular voltage and resistance
- Taxon
- Avicennia germinans
Avicennia germinanst0 - Treatment
- K+, Na+, or Mg++e0
- Outcome
- transcellular voltage and resistancee0
- Direction
- decreasede0
Not reportedOrgan / stageComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Avicennia germinans”
e0“Increasing the concentrations of K+, Na+, or Mg++ in the bath medium decreased the measured transcellular voltage and resistance”
Claim · model-written summary
The velocity and magnitude of these transcellular depolarizations varied: K+ > Na+ > Mg++ >> Cl-
- Taxon
- Avicennia germinansAvicennia germinanst0
- Treatment
- K+ > Na+ > Mg++ >> Cl-e0
- Outcome
- velocity and magnitudee0
- Direction
- variede0
Not reportedOrgan / stageComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Avicennia germinans”
e0“The velocity and magnitude of these transcellular depolarizations varied: K+ > Na+ > Mg++ >> Cl-”
Claim · model-written summary
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
- Taxon
- Avicennia germinansAvicennia germinanst0
- Treatment
- pH of the incubation medium from 5.5 to 7.0e0
- Outcome
- rate and the magnitude of voltage decreasee0
- Direction
- reducede0
Not reportedOrgan / stageComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Avicennia germinans”
e0“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”
Claim · model-written summary
tissue incubated at pH 8.0 did not form secretion droplets
- Taxon
- Avicennia germinansAvicennia germinanst0
- Treatment
- pH 8.0e0
- Outcome
- secretion dropletse0
- Direction
- did not forme0
Not reportedOrgan / stageComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Avicennia germinans”
e0“tissue incubated at pH 8.0 did not form secretion droplets”
Claim · model-written summary
Transcellular depolarizations resulting from concentration shifts of K+ from 10 to 100 mM were partially suppressed in the presence of La+++
- Taxon
- Avicennia germinansAvicennia germinanst0
- Treatment
- La+++e0
- Outcome
- Transcellular depolarizationse0
- Direction
- partially suppressede0
Not reportedOrgan / stageComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Avicennia germinans”
e0“Transcellular depolarizations resulting from concentration shifts of K+ from 10 to 100 mM were partially suppressed in the presence of La+++”
Claim · model-written summary
The voltage decrease accompanying changes in K+ concentration was partially blocked by tetraethyl ammonium chloride (TEA) but not in Na+
- Taxon
- Avicennia germinansAvicennia germinanst0
- Treatment
- tetraethyl ammonium chloride (TEA)e0
- Outcome
- voltage decreasee0
- Direction
- partially blockede0
Not reportedOrgan / stageComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Avicennia germinans”
e0“The voltage decrease accompanying changes in K+ concentration was partially blocked by tetraethyl ammonium chloride (TEA) but not in Na+”
Claim · model-written summary
Niflumic acid reduced the magnitude of the transcellular voltage with increased K+ concentration but did not affect the velocity
- Taxon
- Avicennia germinansAvicennia germinanst0
- Treatment
- Niflumic acide0
- Outcome
- magnitude of the transcellular voltagee0
- Direction
- reducede0
Not reportedOrgan / stageComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Avicennia germinans”
e0“Niflumic acid reduced the magnitude of the transcellular voltage with increased K+ concentration but did not affect the velocity”
Claim · model-written summary
Niflumic acid reduced the magnitude of the transcellular voltage with increased K+ concentration but did not affect the velocity
- Taxon
- Avicennia germinansAvicennia germinanst0
- Treatment
- Niflumic acide0
- Outcome
- velocitye0
- Direction
- did not affecte0
Not reportedOrgan / stageComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Avicennia germinans”
e0“Niflumic acid reduced the magnitude of the transcellular voltage with increased K+ concentration but did not affect the velocity”
Claim · model-written summary
The small voltage decrease accompanying changes in Cl- concentration was not affected by either TEA or niflumic acid (NA)
- Taxon
- Avicennia germinansAvicennia germinanst0
- Treatment
- TEA or niflumic acid (NA)e0
- Outcome
- voltage decreasee0
- Direction
- not affectede0
Not reportedOrgan / stageComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Avicennia germinans”
e0“The small voltage decrease accompanying changes in Cl- concentration was not affected by either TEA or niflumic acid (NA)”
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 germinansAvicennia germinanst0
- Treatment
- 2-4-Dinitrophenol (DNP), sodium azide, and vanadatee0
- Outcome
- rapidity and the magnitude of voltage decreasee0
- Direction
- reducede0
Not reportedOrgan / stageComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
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++”
Claim · model-written summary
a considerable cation flux occurred across epidermal peels of A germinans in regions where there were salt glands
- Taxon
- Avicennia germinansAvicennia germinanst0
- Outcome
- cation fluxe0
Not reportedOrgan / stageDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Avicennia germinans”
e0“a considerable cation flux occurred across epidermal peels of A germinans in regions where there were salt glands”
Claim · model-written summary
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
- Taxon
- Avicennia germinansAvicennia germinanst0
- Outcome
- Salt secretione0
- Qualifier
- modified chemiosmotic hypothesise0
Not reportedOrgan / stageDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Avicennia germinans”
e0“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”