Abstract
A pear (Pyrus communis L. cv Passe Crassane) cell suspension was used as a model system to study the influence of gibberellin on processes related to fruit ripening. Growth of the cell cultures was inhibited and their loss of viability was accelerated when 0.5 millimolar gibberllic acid (GA(3)) was added to suspensions at two stages of cell development, namely, growth and quiescence. Cell respiration rate was unaffected up to 2 millimolar GA(3) but ethylene production, both basal and 1-aminocyclopropane-1-carboxylic acid-induced, was inhibited at all stages of cell development. However, the degree of inhibition decreased as the cell cultures aged. The site of ethylene inhibition by GA(3) appeared to be related to the ethylene-forming enzyme. The coincident acceleration of cell senescence and inhibition of ethylene production indicate that the pear cell suspension cannot serve as an analogous model for studying the mode of action of gibberellin in delaying ripening and senescence of fruits in its entirety, although certain specific effects might be relevant.
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Claims 7
Claim · model-written summary
Growth of pear cell cultures was inhibited by 0.5 mM GA3 added at growth and quiescence stages.
- Taxon
- pear
_Poirier_Fleurs_et_feuilles.jpg?width=60)
Pyrus communise0 - Material
- Passe Crassanee0
- Organ / stage
- two stages of cell developmente1
- Treatment
- 0.5 millimolar gibberllic acid (GA(3))e1
- Outcome
- Growth of the cell culturese1
- Direction
- inhibitede1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
_Poirier_Fleurs_et_feuilles.jpg?width=500)
Verbatim
e0“A pear (Pyrus communis L. cv Passe Crassane) cell suspension”
e1“Growth of the cell cultures was inhibited and their loss of viability was accelerated when 0.5 millimolar gibberllic acid (GA(3)) was added to suspensions at two stages of cell development”
Claim · model-written summary
Loss of viability of pear cell cultures was accelerated by 0.5 mM GA3 added at growth and quiescence stages.
- Taxon
- pearPyrus communise0
- Material
- Passe Crassanee0
- Organ / stage
- two stages of cell developmente1
- Treatment
- 0.5 millimolar gibberllic acid (GA(3))e1
- Outcome
- loss of viabilitye1
- Direction
- acceleratede1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A pear (Pyrus communis L. cv Passe Crassane) cell suspension”
e1“Growth of the cell cultures was inhibited and their loss of viability was accelerated when 0.5 millimolar gibberllic acid (GA(3)) was added to suspensions at two stages of cell development”
Claim · model-written summary
Cell respiration rate of pear cell suspensions was unaffected by GA3 up to 2 mM.
- Taxon
- pearPyrus communise0
- Treatment
- GA(3)e1
- Outcome
- Cell respiration ratee1
- Direction
- unaffectede1
- Qualifier
- up to 2 millimolare1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A pear (Pyrus communis L. cv Passe Crassane) cell suspension”
e1“Cell respiration rate was unaffected up to 2 millimolar GA(3) but ethylene production, both basal and 1-aminocyclopropane-1-carboxylic acid-induced, was inhibited at all stages of cell development”
Claim · model-written summary
Both basal and ACC-induced ethylene production of pear cell suspensions was inhibited by GA3 at all stages of cell development.
- Taxon
- pearPyrus communise0
- Organ / stage
- all stages of cell developmente1
- Treatment
- GA(3)e1
- Outcome
- ethylene productione1
- Direction
- inhibitede1
- Qualifier
- both basal and 1-aminocyclopropane-1-carboxylic acid-inducede1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A pear (Pyrus communis L. cv Passe Crassane) cell suspension”
e1“Cell respiration rate was unaffected up to 2 millimolar GA(3) but ethylene production, both basal and 1-aminocyclopropane-1-carboxylic acid-induced, was inhibited at all stages of cell development”
Claim · model-written summary
The degree of GA3 inhibition of ethylene production decreased as the pear cell cultures aged.
- Taxon
- pearPyrus communise0
- Organ / stage
- cell cultures agede1
- Outcome
- degree of inhibitione1
- Direction
- decreasede1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A pear (Pyrus communis L. cv Passe Crassane) cell suspension”
e1“the degree of inhibition decreased as the cell cultures aged”
Claim · model-written summary
The site of GA3 inhibition of ethylene production appeared to be related to the ethylene-forming enzyme.
- Taxon
- pearPyrus communise0
- Treatment
- GA(3)e1
- Gene
- ethylene-forming enzymee1
- Outcome
- ethylene inhibitione1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A pear (Pyrus communis L. cv Passe Crassane) cell suspension”
e1“The site of ethylene inhibition by GA(3) appeared to be related to the ethylene-forming enzyme”
Claim · model-written summary
Because senescence was accelerated while ethylene production was inhibited, the pear cell suspension cannot serve as an analogous model for gibberellin action in delaying fruit ripening and senescence.
- Taxon
- pearPyrus communise0
- Outcome
- cannot serve as an analogous modele0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the pear cell suspension cannot serve as an analogous model for studying the mode of action of gibberellin in delaying ripening and senescence of fruits in its entirety”
The same questions in other papers
Gibberellic acid · growth · Pyrus communis (pear)Results differ
2 papers in the same direction as this paper · 9 in the opposite direction
- positive
- positive
- positive
8 papers more in this group
See all 12 papers →Gibberellic acid · physiology: hormones · Pyrus communis (pear)Positive and negative results
1 paper in the same direction as this paper · 1 in the opposite direction
- positive
- no effect
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.