Abstract
The increase in the ratio of root growth to shoot growth that occurs in response to phosphate (Pi) deprivation is paralleled by a decrease in cytokinin levels under the same conditions. However, the role of cytokinin in the rescue system for Pi starvation remains largely unknown. We have isolated a gene from Arabidopsis thaliana (AtIPS1) that is induced by Pi starvation, and studied the effect of cytokinin on its expression in response to Pi deprivation. AtIPS1 belongs to the TPSI1/Mt4 family, the members of which are specifically induced by Pi starvation, and the RNAs of which contain only short, non-conserved open reading frames. Pi deprivation induces AtIPS1 expression in all cells of wild-type plants, whereas in the pho1 mutant grown on Pi-rich soils, AtIPS1 expression in the root was delimited by the endodermis. This supports the view that pho1 is impaired in xylem loading of Pi, and that long-distance signals controlling the Pi starvation responses act via negative control. Exogenous cytokinins repress the expression of AtIPS1 and other Pi starvation-responsive genes in response to Pi deprivation. However, cytokinins did not repress the increase in root-hair number and length induced by Pi starvation, a response dependent on local Pi concentration rather than on whole-plant Pi status. Our results raise the possibility that cytokinins may be involved in the negative modulation of long-distance, systemically controlled Pi starvation responses, which are dependent on whole-plant Pi status.
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Claims 6
Claim · model-written summary
AtIPS1 was isolated and found inducible by phosphate starvation.
- Taxon
- Arabidopsis thaliana
Arabidopsis thalianae0 - Gene
- AtIPS1e0
- Outcome
- induced by Pi starvatione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“We have isolated a gene from Arabidopsis thaliana (AtIPS1) that is induced by Pi starvation”
Claim · model-written summary
AtIPS1 belongs to the TPSI1/Mt4 family with short, non-conserved open reading frames.
- Taxon
- ArabidopsisArabidopsist0
- Gene
- AtIPS1e0
- Outcome
- TPSI1/Mt4 familye0
- Qualifier
- short, non-conserved open reading framese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Arabidopsis”
e0“AtIPS1 belongs to the TPSI1/Mt4 family, the members of which are specifically induced by Pi starvation, and the RNAs of which contain only short, non-conserved open reading frames”
Claim · model-written summary
Phosphate deprivation induced AtIPS1 in all wild-type plant cells.
- Taxon
- ArabidopsisArabidopsist0
- Material
- wild-type plantse0
- Treatment
- Pi deprivatione0
- Gene
- AtIPS1e0
- Outcome
- AtIPS1 expressione0
- Direction
- inducese0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Arabidopsis”
e0“Pi deprivation induces AtIPS1 expression in all cells of wild-type plants”
Claim · model-written summary
In pho1 roots on Pi-rich soils, AtIPS1 expression was delimited by the endodermis.
- Taxon
- ArabidopsisArabidopsist0
- Material
- pho1 mutante0
- Organ / stage
- roote0
- Gene
- AtIPS1e0
- Outcome
- AtIPS1 expression in the root was delimited by the endodermise0
- Qualifier
- Pi-rich soilse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Arabidopsis”
e0“in the pho1 mutant grown on Pi-rich soils, AtIPS1 expression in the root was delimited by the endodermis”
Claim · model-written summary
Exogenous cytokinins repressed AtIPS1 and other phosphate-starvation-responsive genes.
- Taxon
- ArabidopsisArabidopsist0
- Treatment
- Exogenous cytokininse0
- Outcome
- expression of AtIPS1 and other Pi starvation-responsive genese0
- Direction
- represse0
- Qualifier
- in response to Pi deprivatione0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Arabidopsis”
e0“Exogenous cytokinins repress the expression of AtIPS1 and other Pi starvation-responsive genes in response to Pi deprivation”
Claim · model-written summary
Cytokinins did not repress phosphate-induced root-hair number and length increases.
- Taxon
- ArabidopsisArabidopsist0
- Organ / stage
- root-haire0
- Treatment
- cytokininse0
- Outcome
- root-hair number and lengthe0
- Direction
- did not represse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Arabidopsis”
e0“cytokinins did not repress the increase in root-hair number and length induced by Pi starvation”
The same questions in other papers
class · growth · ArabidopsisPositive and negative results
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