Abstract
Abscisic acid (ABA) catabolism is one of the determinants of endogenous ABA levels affecting numerous aspects of plant growth and abiotic stress responses. The major ABA catabolic pathway is triggered by ABA 8'-hydroxylation catalysed by the cytochrome P450 CYP707A family. Among four members of Arabidopsis CYP707As, the expression of CYP707A3 was most highly induced in response to both dehydration and subsequent rehydration. A T-DNA insertional cyp707a3-1 mutant contained higher ABA levels in turgid plants, which showed a reduced transpiration rate and hypersensitivity to exogenous ABA during early seedling growth. On dehydration, the cyp707a3-1 mutant accumulated a higher amount of stress-induced ABA than the wild type, an event that occurred relatively later and was coincident with slow drought induction of CYP707A3. The cyp707a3 mutant plants exhibited both exaggerated ABA-inducible gene expression and enhanced drought tolerance. Conversely, constitutive expression of CYP707A3 relieved growth retardation by ABA, increased transpiration, and a reduction of endogenous ABA in both turgid and dehydrated plants. Taken together, our results indicate that CYP707A3 plays an important role in determining threshold levels of ABA during dehydration and after rehydration.
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Claims 10
Claim · model-written summary
CYP707A3 expression was most strongly induced by dehydration and rehydration.
- Taxon
- Arabidopsis thaliana
Arabidopsis thalianat0 - Treatment
- both dehydration and subsequent rehydratione0
- Gene
- CYP707A3e0
- Outcome
- expression of CYP707A3e0
- Direction
- most highly inducede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Arabidopsis thaliana”
e0“expression of CYP707A3 was most highly induced in response to both dehydration and subsequent rehydration”
Claim · model-written summary
The cyp707a3-1 mutant had higher ABA levels in turgid plants.
- Taxon
- Arabidopsis thalianaArabidopsis thalianat0
- Material
- cyp707a3-1 mutante0
- Outcome
- ABA levelse0
- Direction
- highere0
- Qualifier
- turgid plantse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Arabidopsis thaliana”
e0“cyp707a3-1 mutant contained higher ABA levels in turgid plants”
Claim · model-written summary
The mutant had reduced transpiration.
- Taxon
- Arabidopsis thalianaArabidopsis thalianat0
- Material
- cyp707a3-1 mutante0
- Outcome
- transpiration ratee0
- Direction
- reducede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Arabidopsis thaliana”
e0“cyp707a3-1 mutant contained higher ABA levels in turgid plants, which showed a reduced transpiration rate”
Claim · model-written summary
The mutant was hypersensitive to exogenous ABA during early seedling growth.
- Taxon
- Arabidopsis thalianaArabidopsis thalianat0
- Organ / stage
- early seedling growthe0
- Outcome
- hypersensitivity to exogenous ABAe0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Arabidopsis thaliana”
e0“hypersensitivity to exogenous ABA during early seedling growth”
Claim · model-written summary
On dehydration the mutant accumulated more stress-induced ABA than wild type.
- Taxon
- Arabidopsis thalianaArabidopsis thalianat0
- Material
- cyp707a3-1 mutante0
- Treatment
- dehydratione0
- Outcome
- stress-induced ABAe0
- Direction
- highere0
- Comparator
- wild typee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Arabidopsis thaliana”
e0“On dehydration, the cyp707a3-1 mutant accumulated a higher amount of stress-induced ABA than the wild type”
Claim · model-written summary
The mutant had exaggerated ABA-inducible gene expression.
- Taxon
- Arabidopsis thalianaArabidopsis thalianat0
- Material
- cyp707a3 mutant plantse0
- Outcome
- ABA-inducible gene expressione0
- Direction
- exaggeratede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Arabidopsis thaliana”
e0“cyp707a3 mutant plants exhibited both exaggerated ABA-inducible gene expression and enhanced drought tolerance”
Claim · model-written summary
The mutant had enhanced drought tolerance.
- Taxon
- Arabidopsis thalianaArabidopsis thalianat0
- Material
- cyp707a3 mutant plantse0
- Outcome
- drought tolerancee0
- Direction
- enhancede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Arabidopsis thaliana”
e0“cyp707a3 mutant plants exhibited both exaggerated ABA-inducible gene expression and enhanced drought tolerance”
Claim · model-written summary
Constitutive CYP707A3 expression relieved ABA growth retardation.
- Taxon
- Arabidopsis thalianaArabidopsis thalianat0
- Treatment
- constitutive expression of CYP707A3e0
- Gene
- CYP707A3e0
- Outcome
- growth retardation by ABAe0
- Direction
- relievede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Arabidopsis thaliana”
e0“constitutive expression of CYP707A3 relieved growth retardation by ABA”
Claim · model-written summary
Constitutive CYP707A3 expression increased transpiration.
- Taxon
- Arabidopsis thalianaArabidopsis thalianat0
- Treatment
- constitutive expression of CYP707A3e0
- Outcome
- transpiratione0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Arabidopsis thaliana”
e0“constitutive expression of CYP707A3 relieved growth retardation by ABA, increased transpiration”
Claim · model-written summary
Constitutive CYP707A3 expression reduced endogenous ABA in turgid and dehydrated plants.
- Taxon
- Arabidopsis thalianaArabidopsis thalianat0
- Treatment
- constitutive expression of CYP707A3e0
- Outcome
- endogenous ABAe0
- Direction
- reductione0
- Qualifier
- both turgid and dehydrated plantse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Arabidopsis thaliana”
e0“constitutive expression of CYP707A3 relieved growth retardation by ABA, increased transpiration, and a reduction of endogenous ABA in both turgid and dehydrated plants”
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