Abstract
Auxin activates pumping of protons from the symplast to the apoplast and causes hyperpolarization of the symplast membrane in the elongation zone of Vigna stems prior to the acceleration of growth. This auxin-induced hyperpolarization has been studied in most cases in hypocotyl segments excised from the elongation zone. In the present study, mature-zone segments were perfused with IAA by the xylem perfusion technique in an effort to determine whether or not IAA has any effects in the mature zone. Although no hyperpolarization of the symplast membrane was observed upon the perfusion with auxin alone, auxin-induced hyperpolarization was observed when mature-zone segments had been pretreated with GA3, in the absence of an increase in the growth rate. These results suggest that cells in the mature zone have lost the ability to activate the proton-pumping machinery in response to auxin but that this ability can be restored by treatment with GA3. This effect of GA3 suggests the possibility that the concentration of gibberellin in a tissue controls one of the cell's responses to auxin, namely, activation of the proton pump.
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Claims 5
Claim · model-written summary
Auxin alone did not induce hyperpolarization in mature segments.
- Taxon
- Vigna unguiculata
Vigna unguiculatat0 - Treatment
- auxin alonee0
- Outcome
- hyperpolarization of the symplast membranee0
- Direction
- no hyperpolarizatione0
Not reportedOrgan / stageComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Vigna unguiculata”
e0“no hyperpolarization of the symplast membrane was observed upon the perfusion with auxin alone”
Claim · model-written summary
GA3 pretreatment enabled auxin-induced hyperpolarization in mature segments.
- Taxon
- Vigna unguiculataVigna unguiculatat0
- Organ / stage
- mature-zone segmentse0
- Treatment
- pretreated with GA3e0
- Outcome
- auxin-induced hyperpolarizatione0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Vigna unguiculata”
e0“auxin-induced hyperpolarization was observed when mature-zone segments had been pretreated with GA3”
Claim · model-written summary
The restored hyperpolarization occurred without increased growth rate.
- Taxon
- Vigna unguiculataVigna unguiculatat0
- Outcome
- growth ratee0
- Direction
- absence of an increasee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Vigna unguiculata”
e0“in the absence of an increase in the growth rate”
Claim · model-written summary
GA3 may restore the mature-zone response of proton pumping to auxin.
- Taxon
- Vigna unguiculataVigna unguiculatat0
- Treatment
- GA3e0
- Outcome
- this ability can be restorede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Vigna unguiculata”
e0“this ability can be restored by treatment with GA3”
Claim · model-written summary
Tissue gibberellin concentration may control auxin activation of the proton pump.
- Taxon
- Vigna unguiculataVigna unguiculatat0
- Compound
- gibberelline0
- Outcome
- activation of the proton pumpe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Vigna unguiculata”
e0“the concentration of gibberellin in a tissue controls one of the cell's responses to auxin, namely, activation of the proton pump”
The same questions in other papers
Gibberellic acid · physiology: hormones · Vigna unguiculata (cowpea)Results agree
1 paper in the same direction as this paper
- 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.