Abstract
Indole-3-acetic acid (IAA) is a predominant form of active auxin in plants. In addition to de novo biosynthesis and release from its conjugate forms, IAA can be converted from its precursor indole-3-butyric acid (IBA). The IBA-derived IAA may help drive root hair elongation in Arabidopsis thaliana seedlings, but how the IBA-to-IAA conversion is regulated and affects IAA function requires further investigation. In this study, HOMEOBOX PROTEIN 24 (HB24), a transcription factor in the zinc finger-homeodomain family (ZF-HD family) of proteins, was identified. With loss of HB24 function, defective growth occurred in root hairs. INDOLE-3-BUTYRIC ACID RESPONSE 1 (IBR1), which encodes an enzyme involved in the IBA-to-IAA conversion, was identified as a direct target of HB24 for the control of root hair elongation. The exogenous IAA or auxin analogue 1-naphthalene acetic acid (NAA) both rescued the root hair growth phenotype of hb24 mutants, but IBA did not, suggesting a role for HB24 in the IBA-to-IAA conversion. Therefore, HB24 participates in root hair elongation by upregulating the expression of IBR1 and subsequently promoting the IBA-to-IAA conversion. Moreover, IAA also elevated the expression of HB24, suggesting a feedback loop is involved in IBA-to-IAA conversion-mediated root hair elongation.
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Claims 7
Claim · model-written summary
Loss of HB24 function produced defective root hair growth.
- Taxon
- Arabidopsis thaliana
Arabidopsis thalianat0 - Treatment
- loss of HB24 functione0
- Gene
- HB24e0
- Outcome
- defective growth occurred in root hairse0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“With loss of HB24 function, defective growth occurred in root hairs.”
t0“Arabidopsis thaliana seedlings”
Claim · model-written summary
IBR1 was identified as a direct target of HB24 in root hair elongation.
- Taxon
- Arabidopsis thalianaArabidopsis thalianat0
- Gene
- INDOLE-3-BUTYRIC ACID RESPONSE 1 (IBR1)e0
- Outcome
- direct target of HB24e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“INDOLE-3-BUTYRIC ACID RESPONSE 1 (IBR1), which encodes an enzyme involved in the IBA-to-IAA conversion, was identified as a direct target of HB24 for the control of root hair elongation.”
t0“Arabidopsis thaliana seedlings”
Claim · model-written summary
Exogenous IAA rescued the hb24 root hair phenotype.
- Taxon
- Arabidopsis thalianaArabidopsis thalianat0
- Material
- hb24 mutantse0
- Treatment
- exogenous IAAe0
- Outcome
- root hair growth phenotypee0
- Direction
- rescuede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The exogenous IAA or auxin analogue 1-naphthalene acetic acid (NAA) both rescued the root hair growth phenotype of hb24 mutants, but IBA did not”
t0“Arabidopsis thaliana seedlings”
Claim · model-written summary
Exogenous NAA rescued the hb24 root hair phenotype.
- Taxon
- Arabidopsis thalianaArabidopsis thalianat0
- Material
- hb24 mutantse0
- Treatment
- 1-naphthalene acetic acid (NAA)e0
- Outcome
- root hair growth phenotypee0
- Direction
- rescuede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The exogenous IAA or auxin analogue 1-naphthalene acetic acid (NAA) both rescued the root hair growth phenotype of hb24 mutants, but IBA did not”
t0“Arabidopsis thaliana seedlings”
Claim · model-written summary
Exogenous IBA did not rescue the hb24 root hair phenotype.
- Taxon
- Arabidopsis thalianaArabidopsis thalianat0
- Material
- hb24 mutantse0
- Treatment
- IBAe0
- Outcome
- root hair growth phenotypee0
- Direction
- did note0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The exogenous IAA or auxin analogue 1-naphthalene acetic acid (NAA) both rescued the root hair growth phenotype of hb24 mutants, but IBA did not”
t0“Arabidopsis thaliana seedlings”
Claim · model-written summary
HB24 promotes root hair elongation by upregulating IBR1 and IBA-to-IAA conversion.
- Taxon
- Arabidopsis thalianaArabidopsis thalianat0
- Gene
- HB24e0
- Outcome
- root hair elongatione0
- Qualifier
- upregulating the expression of IBR1 and subsequently promoting the IBA-to-IAA conversione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“HB24 participates in root hair elongation by upregulating the expression of IBR1 and subsequently promoting the IBA-to-IAA conversion.”
t0“Arabidopsis thaliana seedlings”
Claim · model-written summary
IAA elevated HB24 expression, suggesting a feedback loop.
- Taxon
- Arabidopsis thalianaArabidopsis thalianat0
- Treatment
- IAAe0
- Gene
- HB24e0
- Outcome
- expression of HB24e0
- Direction
- elevatede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“IAA also elevated the expression of HB24, suggesting a feedback loop is involved in IBA-to-IAA conversion-mediated root hair elongation.”
t0“Arabidopsis thaliana seedlings”
The same questions in other papers
indole-3-butyric acid · growth · Arabidopsis thaliana (thale cress)Positive and negative results
1 in the opposite direction
- positive
1-naphthaleneacetic acid · growth · Arabidopsis thaliana (thale cress)Positive and negative results
2 papers in the same direction as this paper · 4 in the opposite direction · 1 reporting no difference from an alternative
- negative
- no effect
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See all 8 papers →indole-3-acetic acid · growth · Arabidopsis thaliana (thale cress)Positive and negative results
8 papers in the same direction as this paper · 2 in the opposite direction · 1 reporting no difference from an alternative
- negative
- no effect
- no effect
8 papers more in this group
See all 12 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.