Abstract
Abstract. When isobutyric acid (IBA) or abscisic acid (ABA) are supplied to leaf sections a similar rapid and marked decrease in the intracellular pH is observed. This acidification is accompanied by an increase in proline level which is about the same for both 3 mol m −3 IBA and 1 mol m −3 ABA treatments. Fusicoccin (FC), known to act at the proton pump level, almost completely suppresses the ABA‐induced acidification of the cell sap, whereas it only partially counteracts the acidifying effect of IBA, in particular during short periods of treatment. This effect of FC is paralleled by a similar inhibition of the induced proline accumulation: in fact, FC completely suppresses the ABA‐induced increase in proline during short treatment periods, whereas it is only effective in inhibiting the IBA‐induced proline accumulation after long treatment periods. These data seem to suggest that the ABA‐ and IBA‐induced changes in proline level might be mediated by changes in the intracellular pH.
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Claims 9
Claim · model-written summary
Isobutyric acid rapidly and markedly decreased intracellular pH in barley leaf sections.
- Taxon
- barley
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Hordeum vulgaret0 - Organ / stage
- leaf sectionse0
- Treatment
- isobutyric acid (IBA)e0
- Outcome
- intracellular pHe0
- Direction
- decreasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
.jpg?width=500)
Verbatim
t0“barley leaves”
e0“When isobutyric acid (IBA) or abscisic acid (ABA) are supplied to leaf sections a similar rapid and marked decrease in the intracellular pH is observed.”
Claim · model-written summary
Abscisic acid rapidly and markedly decreased intracellular pH in barley leaf sections.
- Taxon
- barleyHordeum vulgaret0
- Organ / stage
- leaf sectionse0
- Treatment
- abscisic acid (ABA)e0
- Outcome
- intracellular pHe0
- Direction
- decreasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“barley leaves”
e0“When isobutyric acid (IBA) or abscisic acid (ABA) are supplied to leaf sections a similar rapid and marked decrease in the intracellular pH is observed.”
Claim · model-written summary
Isobutyric acid increased proline to a level similar to ABA.
- Taxon
- barleyHordeum vulgaret0
- Treatment
- 3 mol m −3 IBAe0
- Outcome
- proline levele0
- Direction
- increasee0
- Comparator
- 1 mol m −3 ABAe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“barley leaves”
e0“an increase in proline level which is about the same for both 3 mol m −3 IBA and 1 mol m −3 ABA treatments.”
Claim · model-written summary
ABA increased proline to a level similar to IBA.
- Taxon
- barleyHordeum vulgaret0
- Treatment
- 1 mol m −3 ABAe0
- Outcome
- proline levele0
- Direction
- increasee0
- Comparator
- 3 mol m −3 IBAe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“barley leaves”
e0“an increase in proline level which is about the same for both 3 mol m −3 IBA and 1 mol m −3 ABA treatments.”
Claim · model-written summary
Fusicoccin almost completely suppressed ABA-induced cell-sap acidification.
- Taxon
- barleyHordeum vulgaret0
- Treatment
- Fusicoccin (FC)e0
- Outcome
- acidification of the cell sape0
- Direction
- suppressese0
- Comparator
- ABA‐inducede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“barley leaves”
e0“Fusicoccin (FC), known to act at the proton pump level, almost completely suppresses the ABA‐induced acidification of the cell sap”
Claim · model-written summary
Fusicoccin partially counteracted IBA acidification, especially during short treatment.
- Taxon
- barleyHordeum vulgaret0
- Treatment
- IBAe0
- Outcome
- acidifying effect of IBAe0
- Direction
- counteractse0
- Qualifier
- during short periods of treatmente0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“barley leaves”
e0“it only partially counteracts the acidifying effect of IBA, in particular during short periods of treatment.”
Claim · model-written summary
Fusicoccin completely suppressed ABA-induced proline increase during short treatment.
- Taxon
- barleyHordeum vulgaret0
- Treatment
- FCe0
- Outcome
- increase in prolinee0
- Direction
- suppressese0
- Qualifier
- short treatment periodse0
- Comparator
- ABA‐inducede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“barley leaves”
e0“FC completely suppresses the ABA‐induced increase in proline during short treatment periods”
Claim · model-written summary
Fusicoccin inhibited IBA-induced proline accumulation only after long treatment.
- Taxon
- barleyHordeum vulgaret0
- Treatment
- IBAe0
- Outcome
- proline accumulatione0
- Direction
- inhibitinge0
- Qualifier
- long treatment periodse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“barley leaves”
e0“it is only effective in inhibiting the IBA‐induced proline accumulation after long treatment periods.”
Claim · model-written summary
The authors suggest intracellular pH changes mediate acid-induced proline changes.
- Taxon
- barleyHordeum vulgaret0
- Outcome
- changes in proline levele0
- Qualifier
- changes in the intracellular pHe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“barley leaves”
e0“the ABA‐ and IBA‐induced changes in proline level might be mediated by changes in the intracellular pH”