Abstract
The stimulative effect of cytokinin on ethylene production has been examined in etiolated mungbean hypocotyl segments. The rate of auxin-induced production linearly increased with time in a certain range of exogenous IAA concentration. The rate of induced production doubled with a 10-fold increase in exogenous IAA concentration or addition of benzyladenine at 5 μM. Benzyladenine did not suppress inactivation of the induced ethylene producing system. Although the free IAA level within the tissues was slightly increased by benzyladenine accompanied by a decrease in IAAsp formation, the increased free IAA level did not account for the doubling of the production rate. When the tissues were preincubated with benzyladenine alone followed by postincubation with auxin, the rate of induced production in pretreated tissues was significantly higher than that in untreated or buffer-treated tissues supplied with auxin and benzyladenine simultaneously in the post-incubation medium. Formation and disappearance of the cytokinin effect were temperature dependent. The rate of endogenous production was constant over an experimental period and benzyladenine simply enhanced the rate several-fold after a lag period. Kinetics of the cytokinin stimulation was not the inductive type. Based on these observations, a possible mechanism of the stimulative effect of cytokinin was discussed.
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Claims 12
Claim · model-written summary
Auxin-induced ethylene production increased linearly with time within a range of exogenous IAA concentration.
- Taxon
- mungbean
.jpg?width=60)
Vigna radiatae1 - Organ / stage
- hypocotyl segmentse1
- Outcome
- rate of auxin-induced productione0
- Direction
- increasede0
- Qualifier
- in a certain range of exogenous IAA concentratione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
.jpg?width=500)
Verbatim
e0“The rate of auxin-induced production linearly increased with time in a certain range of exogenous IAA concentration.”
e1“etiolated mungbean hypocotyl segments”
Claim · model-written summary
A tenfold increase in exogenous IAA doubled induced ethylene production.
- Taxon
- mungbeanVigna radiatae1
- Treatment
- 10-fold increase in exogenous IAA concentratione0
- Outcome
- rate of induced productione0
- Direction
- doublede0
- Value
- 10-folde0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The rate of induced production doubled with a 10-fold increase in exogenous IAA concentration”
e1“etiolated mungbean hypocotyl segments”
Claim · model-written summary
Adding 5 μM benzyladenine doubled induced ethylene production.
- Taxon
- mungbeanVigna radiatae1
- Treatment
- addition of benzyladenine at 5 μMe0
- Outcome
- rate of induced productione0
- Direction
- doublede0
- Value
- 5 μMe0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The rate of induced production doubled with a 10-fold increase in exogenous IAA concentration or addition of benzyladenine at 5 μM.”
e1“etiolated mungbean hypocotyl segments”
Claim · model-written summary
Benzyladenine did not suppress inactivation of the induced ethylene-producing system.
- Taxon
- mungbeanVigna radiatae1
- Treatment
- Benzyladeninee0
- Outcome
- inactivation of the induced ethylene producing systeme0
- Direction
- did not suppresse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Benzyladenine did not suppress inactivation of the induced ethylene producing system.”
e1“etiolated mungbean hypocotyl segments”
Claim · model-written summary
Benzyladenine slightly increased free IAA in the tissue.
- Taxon
- mungbeanVigna radiatae1
- Treatment
- benzyladeninee0
- Outcome
- free IAA level within the tissuese0
- Direction
- increasede0
- Qualifier
- slightlye0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the free IAA level within the tissues was slightly increased by benzyladenine”
e1“etiolated mungbean hypocotyl segments”
Claim · model-written summary
Benzyladenine reduced IAAsp formation.
- Taxon
- mungbeanVigna radiatae1
- Treatment
- benzyladeninee0
- Outcome
- IAAsp formatione0
- Direction
- decreasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“benzyladenine accompanied by a decrease in IAAsp formation”
e1“etiolated mungbean hypocotyl segments”
Claim · model-written summary
The increase in free IAA did not explain the doubling of ethylene production.
- Taxon
- mungbeanVigna radiatae1
- Compound
- free IAAe0
- Outcome
- doubling of the production ratee0
- Qualifier
- did not account fore0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the increased free IAA level did not account for the doubling of the production rate”
e1“etiolated mungbean hypocotyl segments”
Claim · model-written summary
Benzyladenine preincubation before auxin gave a significantly higher production rate than simultaneous auxin and benzyladenine.
- Taxon
- mungbeanVigna radiatae1
- Treatment
- preincubated with benzyladenine alone followed by postincubation with auxine0
- Outcome
- rate of induced productione0
- Direction
- highere0
- Comparator
- untreated or buffer-treated tissues supplied with auxin and benzyladenine simultaneouslye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“When the tissues were preincubated with benzyladenine alone followed by postincubation with auxin, the rate of induced production in pretreated tissues was significantly higher than that in untreated or buffer-treated tissues supplied with auxin and benzyladenine simultaneously in the post-incubation medium.”
e1“etiolated mungbean hypocotyl segments”
Claim · model-written summary
Formation and disappearance of the cytokinin effect depended on temperature.
- Taxon
- mungbeanVigna radiatae1
- Outcome
- Formation and disappearance of the cytokinin effecte0
- Qualifier
- temperature dependente0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Formation and disappearance of the cytokinin effect were temperature dependent.”
e1“etiolated mungbean hypocotyl segments”
Claim · model-written summary
Endogenous ethylene production stayed constant over the experimental period.
- Taxon
- mungbeanVigna radiatae1
- Outcome
- rate of endogenous productione0
- Direction
- constante0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The rate of endogenous production was constant over an experimental period”
e1“etiolated mungbean hypocotyl segments”
Claim · model-written summary
Benzyladenine enhanced endogenous ethylene production several-fold after a lag.
- Taxon
- mungbeanVigna radiatae1
- Treatment
- benzyladeninee0
- Outcome
- the ratee0
- Direction
- enhancede0
- Value
- several-folde0
- Qualifier
- after a lag periode0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“benzyladenine simply enhanced the rate several-fold after a lag period”
e1“etiolated mungbean hypocotyl segments”
Claim · model-written summary
Cytokinin stimulation kinetics were not of the inductive type.
- Taxon
- mungbeanVigna radiatae1
- Outcome
- Kinetics of the cytokinin stimulation was not the inductive typee0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Kinetics of the cytokinin stimulation was not the inductive type.”
e1“etiolated mungbean hypocotyl segments”
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