Abstract
Abstract Dissociation of active H + extrusion (−ΔH + ) from K + uptake in pea and maize root segments was attempted by substituting K + in the incubation medium with lipophilic cations assumed to enter the cell by passive, non‐specific, permeation through the lipid component of the plasmalemma. Among the compounds tested, tributylbenzylammonium significantly stimulated −ΔH + in the absence of other monovalent cations in the medium. This effect was much more evident when the experiment was carried out in the presence of fusicoccin, which strongly stimulates proton extrusion and monovalent cation uptake, and hyperpolarizes the trans‐membrane electric potential in these materials. Also the lipophilic cations tetraphenylphosphonium, dimethyldibenzylammonium and hexylguanidine markedly stimulated FC‐promoted −ΔH + . Octylguanidine at a low concentration induced an early stimulation followed by a strong inhibition of −ΔH + . A complete lack of additivity was observed between the effects of lipophilic cations and that of K + on H + extrusion. Lipophilic cations severely inhibited K + uptake. These data are interpreted as supporting the view of an electric, rather than a chemical, (namely, involving the same carrier system) nature of the coupling of active H + extrusion with K + influx.
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Claims 9
Claim · model-written summary
Tributylbenzylammonium significantly stimulated proton extrusion without other monovalent cations.
- Taxon
- pea and maize
Lathyrus oleraceus
Zea mayse1 - Organ / stage
- root segmentse1
- Treatment
- tributylbenzylammoniume0
- Outcome
- −ΔH +e0
- Direction
- stimulatede0
- Comparator
- absence of other monovalent cationse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“tributylbenzylammonium significantly stimulated −ΔH + in the absence of other monovalent cations in the medium”
e1“pea and maize root segments”
Claim · model-written summary
The tributylbenzylammonium stimulation was stronger with fusicoccin.
- Taxon
- pea and maizeLathyrus oleraceusZea mayse1
- Treatment
- fusicoccine0
- Outcome
- −ΔH +e2
- Direction
- much more evidente0
- Comparator
- tributylbenzylammoniume2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“This effect was much more evident when the experiment was carried out in the presence of fusicoccin”
e1“pea and maize root segments”
e2“tributylbenzylammonium significantly stimulated −ΔH +”
Claim · model-written summary
Fusicoccin strongly stimulated proton extrusion and monovalent cation uptake.
- Taxon
- pea and maizeLathyrus oleraceusZea mayse1
- Treatment
- fusicoccine0
- Outcome
- proton extrusion and monovalent cation uptakee0
- Direction
- strongly stimulatese0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“fusicoccin, which strongly stimulates proton extrusion and monovalent cation uptake”
e1“pea and maize root segments”
Claim · model-written summary
Fusicoccin hyperpolarized trans-membrane electric potential.
- Taxon
- pea and maizeLathyrus oleraceusZea mayse1
- Treatment
- fusicoccine2
- Outcome
- trans‐membrane electric potentiale0
- Direction
- hyperpolarizese0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“hyperpolarizes the trans‐membrane electric potential in these materials”
e1“pea and maize root segments”
e2“fusicoccin, which strongly stimulates proton extrusion”
Claim · model-written summary
Tetraphenylphosphonium, dimethyldibenzylammonium and hexylguanidine markedly stimulated fusicoccin-promoted proton extrusion.
- Taxon
- pea and maizeLathyrus oleraceusZea mayse1
- Treatment
- tetraphenylphosphonium, dimethyldibenzylammonium and hexylguanidinee0
- Outcome
- −ΔH +e0
- Direction
- markedly stimulatede0
- Comparator
- FC‐promotede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“tetraphenylphosphonium, dimethyldibenzylammonium and hexylguanidine markedly stimulated FC‐promoted −ΔH +”
e1“pea and maize root segments”
Claim · model-written summary
Low-concentration octylguanidine first stimulated then strongly inhibited proton extrusion.
- Taxon
- pea and maizeLathyrus oleraceusZea mayse1
- Treatment
- Octylguanidine at a low concentratione0
- Outcome
- −ΔH +e0
- Direction
- an early stimulation followed by a strong inhibitione0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Octylguanidine at a low concentration induced an early stimulation followed by a strong inhibition of −ΔH +”
e1“pea and maize root segments”
Claim · model-written summary
Effects of lipophilic cations and potassium on proton extrusion were not additive.
- Taxon
- pea and maizeLathyrus oleraceusZea mayse1
- Treatment
- lipophilic cationse0
- Outcome
- H + extrusione0
- Direction
- lack of additivitye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A complete lack of additivity was observed between the effects of lipophilic cations and that of K + on H + extrusion”
e1“pea and maize root segments”
Claim · model-written summary
Lipophilic cations severely inhibited potassium uptake.
- Taxon
- pea and maizeLathyrus oleraceusZea mayse1
- Treatment
- Lipophilic cationse0
- Outcome
- K + uptakee0
- Direction
- severely inhibitede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Lipophilic cations severely inhibited K + uptake”
e1“pea and maize root segments”
Claim · model-written summary
The results support electrical rather than chemical coupling of proton extrusion to potassium influx.
- Taxon
- pea and maizeLathyrus oleraceusZea mayse1
- Outcome
- coupling of active H + extrusion with K + influxe0
- Qualifier
- electric, rather than a chemicale0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“supporting the view of an electric, rather than a chemical, (namely, involving the same carrier system) nature of the coupling of active H + extrusion with K + influx”
e1“pea and maize root segments”
The same questions in other papers
cation · nutrient: content · Lathyrus oleraceus (pea)Positive and negative results
1 in the opposite direction
- positive
cation · nutrient: content · Zea mays (maize)Positive and negative results
2 in the opposite direction
- positive
- positive
fusicoccin · nutrient: content · Zea mays (maize)Positive and negative results
3 papers in the same direction as this paper · 2 in the opposite direction
- no effect
- no effect
- positive
2 papers more in this group
See all 6 papers →fusicoccin · nutrient: content · Lathyrus oleraceus (pea)Results agree
2 papers in the same direction as this paper
- positive
- positive
Claims are grouped by organism, treatment and what was measured or targeted. A paper counts as positive when any of its claims in the group is positive.