Abstract
The hormone auxin regulates growth largely by affecting gene expression. By studying Arabidopsis (Arabidopsis thaliana) mutants deficient in AUXIN RESPONSE FACTORS (ARFs), we have identified three ARF proteins that are required for auxin-responsive hypocotyl elongation. Plants deficient in these factors have reduced responses to environmental conditions that increase auxin levels, including far-red-enriched light and high temperature. Despite having decreased auxin responses, the ARF-deficient plants responded to brassinosteroid and gibberellin, indicating that different hormones can act partially independently. Aux/IAA proteins, encoded by IAA genes, interact with ARF proteins to repress auxin response. Silencing expression of multiple IAA genes increased hypocotyl elongation, suggesting that Aux/IAA proteins modulate ARF activity in hypocotyls in a potential negative feedback loop.
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Claims 5
Claim · model-written summary
Three ARF proteins are required for auxin-responsive hypocotyl elongation.
- Taxon
- Arabidopsis (Arabidopsis thaliana)
Arabidopsis thalianae1 - Gene
- ARF proteinse0
- Outcome
- auxin-responsive hypocotyl elongatione0
- Value
- threee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“we have identified three ARF proteins that are required for auxin-responsive hypocotyl elongation”
e1“Arabidopsis (Arabidopsis thaliana) mutants”
Claim · model-written summary
ARF-deficient plants had reduced responses to far-red-enriched light and high temperature.
- Taxon
- Arabidopsis (Arabidopsis thaliana)Arabidopsis thalianae1
- Material
- Plants deficient in these factorse0
- Treatment
- far-red-enriched light and high temperaturee0
- Outcome
- responses to environmental conditionse0
- Direction
- reducede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Plants deficient in these factors have reduced responses to environmental conditions that increase auxin levels, including far-red-enriched light and high temperature”
e1“Arabidopsis (Arabidopsis thaliana) mutants”
Claim · model-written summary
ARF-deficient plants responded to brassinosteroid.
- Taxon
- Arabidopsis (Arabidopsis thaliana)Arabidopsis thalianae1
- Material
- ARF-deficient plantse0
- Treatment
- brassinosteroide0
- Outcome
- responded to brassinosteroide0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the ARF-deficient plants responded to brassinosteroid and gibberellin”
e1“Arabidopsis (Arabidopsis thaliana) mutants”
Claim · model-written summary
ARF-deficient plants responded to gibberellin.
- Taxon
- Arabidopsis (Arabidopsis thaliana)Arabidopsis thalianae1
- Material
- ARF-deficient plantse0
- Treatment
- gibberelline0
- Outcome
- responded to brassinosteroid and gibberelline0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the ARF-deficient plants responded to brassinosteroid and gibberellin”
e1“Arabidopsis (Arabidopsis thaliana) mutants”
Claim · model-written summary
Silencing multiple IAA genes increased hypocotyl elongation.
- Taxon
- Arabidopsis (Arabidopsis thaliana)Arabidopsis thalianae1
- Treatment
- Silencing expression of multiple IAA genese0
- Gene
- IAA genese0
- Outcome
- hypocotyl elongatione0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Silencing expression of multiple IAA genes increased hypocotyl elongation”
e1“Arabidopsis (Arabidopsis thaliana) mutants”
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