Abstract
Since CO(2) is known to stimulate ethylene production by promoting the conversion of 1-aminocyclopropane-1-carboxylic acid (ACC) to ethylene, the effect of CO(2) on the activity and the development of the ethylene forming enzyme (EFE) was studied in tobacco (Nicotiana tabacum L. cv Havana 425 and Xanthi) leaf discs. In addition to previous observations that EFE activity is dependent on CO(2) concentration and is saturable with 2% CO(2), present data show two saturation curves at 2% and 10% CO(2). Promotion of EFE development was dependent also on CO(2) concentration (saturated at 2% CO(2)) and duration (maximum at 24 in the dark), and was abolished by 20 micromolar cycloheximide. Application of exogenous ethylene (20 microliters per liter) or light treatment further increased the CO(2)-enhanced development of EFE, implying that these two factors can also affect EFE development via interaction with CO(2). The results suggest that CO(2) exerts its stimulatory effect on the conversion of ACC to ethylene by enhancing not only the activity but also the synthesis of EFE in leaf discs.
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Claims 8
Claim · model-written summary
EFE activity showed saturation curves at 2% and 10% CO2.
- Taxon
- Tobacco
Nicotiana tabacumt0 - Outcome
- saturation curvese0
- Value
- 2% and 10% CO(2)e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“present data show two saturation curves at 2% and 10% CO(2)”
t0“Tobacco Leaf Discs”
Claim · model-written summary
CO2 promoted EFE development with concentration dependence and saturation at 2% CO2.
- Taxon
- TobaccoNicotiana tabacumt0
- Treatment
- CO(2)e0
- Outcome
- EFE developmente0
- Direction
- Promotione0
- Value
- 2% CO(2)e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Tobacco Leaf Discs”
e0“Promotion of EFE development was dependent also on CO(2) concentration (saturated at 2% CO(2))”
Claim · model-written summary
EFE development reached a maximum at 24 in the dark.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Tobacco Leaf Discs”
e0“duration (maximum at 24 in the dark)”
Claim · model-written summary
Cycloheximide abolished promotion of EFE development.
- Taxon
- TobaccoNicotiana tabacumt0
- Treatment
- 20 micromolar cycloheximidee0
- Outcome
- EFE developmente0
- Direction
- abolishede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Tobacco Leaf Discs”
e0“Promotion of EFE development was dependent also on CO(2) concentration (saturated at 2% CO(2)) and duration (maximum at 24 in the dark), and was abolished by 20 micromolar cycloheximide”
Claim · model-written summary
Exogenous ethylene further increased CO2-enhanced EFE development.
- Taxon
- TobaccoNicotiana tabacumt0
- Treatment
- exogenous ethylene (20 microliters per liter)e0
- Outcome
- CO(2)-enhanced development of EFEe0
- Direction
- further increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Tobacco Leaf Discs”
e0“Application of exogenous ethylene (20 microliters per liter) or light treatment further increased the CO(2)-enhanced development of EFE”
Claim · model-written summary
Light further increased CO2-enhanced EFE development.
- Taxon
- TobaccoNicotiana tabacumt0
- Treatment
- light treatmente0
- Outcome
- CO(2)-enhanced development of EFEe0
- Direction
- further increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Tobacco Leaf Discs”
e0“Application of exogenous ethylene (20 microliters per liter) or light treatment further increased the CO(2)-enhanced development of EFE”
Claim · model-written summary
CO2 may stimulate ACC conversion to ethylene through enhanced EFE activity.
- Taxon
- TobaccoNicotiana tabacumt0
- Treatment
- CO(2)e0
- Outcome
- conversion of ACC to ethylenee0
- Qualifier
- activitye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Tobacco Leaf Discs”
e0“CO(2) exerts its stimulatory effect on the conversion of ACC to ethylene by enhancing not only the activity but also the synthesis of EFE in leaf discs”
Claim · model-written summary
CO2 may stimulate ACC conversion to ethylene through enhanced EFE synthesis.
- Taxon
- TobaccoNicotiana tabacumt0
- Treatment
- CO(2)e0
- Outcome
- conversion of ACC to ethylenee0
- Qualifier
- synthesis of EFEe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Tobacco Leaf Discs”
e0“CO(2) exerts its stimulatory effect on the conversion of ACC to ethylene by enhancing not only the activity but also the synthesis of EFE in leaf discs”
The same questions in other papers
ethene · physiology: hormones · Nicotiana tabacum (tobacco)Results differ
3 papers in the same direction as this paper · 4 in the opposite direction
- no effect
- negative
- negative
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See all 8 papers →cycloheximide · physiology: hormones · Nicotiana tabacum (tobacco)Positive and negative results
1 paper in the same direction as this paper · 1 in the opposite direction
- positive
- no effect
co2 · physiology: hormones · Nicotiana tabacum (tobacco)Positive and negative results
3 papers in the same direction as this paper · 1 in the opposite direction
- positive
- negative
- positive
1 paper more in this group
See all 5 papers →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.