Abstract
The postembryonic developmental program of the plant root system is plastic and allows changes in root architecture to adapt to environmental conditions such as water and nutrient availability. Among essential nutrients, phosphorus (P) often limits plant productivity because of its low mobility in soil. Therefore, the architecture of the root system may determine the capacity of the plant to acquire this nutrient. We studied the effect of P availability on the development of the root system in Arabidopsis. We found that at P-limiting conditions (<50 microM), the Arabidopsis root system undergoes major architectural changes in terms of lateral root number, lateral root density, and primary root length. Treatment with auxins and auxin antagonists indicate that these changes are related to an increase in auxin sensitivity in the roots of P-deprived Arabidopsis seedlings. It was also found that the axr1-3, axr2-1, and axr4-1 Arabidopsis mutants have normal responses to low P availability conditions, whereas the iaa28-1 mutant shows resistance to the stimulatory effects of low P on root hair and lateral root formation. Analysis of ethylene signaling mutants and treatments with 1-aminocyclopropane-1-carboxylic acid showed that ethylene does not promote lateral root formation under P deprivation. These results suggest that in Arabidopsis, auxin sensitivity may play a fundamental role in the modifications of root architecture by P availability.
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Claims 6
Claim · model-written summary
Low P conditions changed lateral root number, density and primary root length.
- Taxon
- Arabidopsis
Arabidopsise0 - Treatment
- P-limiting conditions (<50 microM)e0
- Outcome
- lateral root number, lateral root density, and primary root lengthe0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“at P-limiting conditions (<50 microM), the Arabidopsis root system undergoes major architectural changes in terms of lateral root number, lateral root density, and primary root length”
Claim · model-written summary
Root architectural changes under P deprivation were related to increased auxin sensitivity.
- Taxon
- ArabidopsisArabidopsise0
- Treatment
- P-deprivede0
- Outcome
- auxin sensitivitye0
- Direction
- increasee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“these changes are related to an increase in auxin sensitivity in the roots of P-deprived Arabidopsis seedlings”
Claim · model-written summary
The axr1-3, axr2-1 and axr4-1 mutants had normal low P responses.
- Taxon
- ArabidopsisArabidopsise0
- Material
- axr1-3, axr2-1, and axr4-1e0
- Outcome
- normal responses to low P availability conditionse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the axr1-3, axr2-1, and axr4-1 Arabidopsis mutants have normal responses to low P availability conditions”
Claim · model-written summary
The iaa28-1 mutant resisted low P stimulation of root hair and lateral root formation.
- Taxon
- ArabidopsisArabidopsist0
- Material
- iaa28-1e0
- Outcome
- resistance to the stimulatory effects of low P on root hair and lateral root formatione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the iaa28-1 mutant shows resistance to the stimulatory effects of low P on root hair and lateral root formation”
t0“Arabidopsis”
Claim · model-written summary
Ethylene did not promote lateral root formation during P deprivation.
- Taxon
- ArabidopsisArabidopsist0
- Treatment
- ethylenee0
- Outcome
- lateral root formatione0
- Direction
- does not promotee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“ethylene does not promote lateral root formation under P deprivation”
t0“Arabidopsis”
Claim · model-written summary
The authors suggest auxin sensitivity may mediate P-induced root architecture changes.
- Taxon
- ArabidopsisArabidopsise0
- Outcome
- modifications of root architecturee0
- Qualifier
- auxin sensitivity may play a fundamental rolee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“in Arabidopsis, auxin sensitivity may play a fundamental role in the modifications of root architecture by P availability”
The same questions in other papers
ethene · growth · ArabidopsisResults differ
8 papers in the same direction as this paper · 17 in the opposite direction
- positive
- positive
- positive
22 papers more in this group
See all 26 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.