Abstract
roots. Using HPTS, we demonstrate that cell wall acidification triggers cellular expansion, which is correlated with a preceding increase of auxin signaling. Reduction in auxin levels, perception, or signaling abolishes both the extracellular acidification and cellular expansion. These findings jointly suggest that endogenous auxin controls apoplastic acidification and the onset of cellular elongation in roots. In contrast, an endogenous or exogenous increase in auxin levels induces a transient alkalinization of the extracellular matrix, reducing cellular elongation. The receptor-like kinase FERONIA is required for this physiological process, which affects cellular root expansion during the gravitropic response. These findings pinpoint a complex, presumably concentration-dependent role for auxin in apoplastic pH regulation, steering the rate of root cell expansion and gravitropic response.
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Claims 7
Claim · model-written summary
Cell wall acidification triggers cellular expansion.
- Taxon
- Arabidopsis thaliana
Arabidopsis thalianat0 - Outcome
- cellular expansione0
- Qualifier
- cell wall acidificatione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“cell wall acidification triggers cellular expansion”
t0“Arabidopsis thaliana”
Claim · model-written summary
Cellular expansion is correlated with preceding increased auxin signaling.
- Taxon
- Arabidopsis thalianaArabidopsis thalianat0
- Compound
- auxine0
- Outcome
- cellular expansione0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“cellular expansion, which is correlated with a preceding increase of auxin signaling”
t0“Arabidopsis thaliana”
Claim · model-written summary
Reduced auxin levels, perception or signaling abolish extracellular acidification.
- Taxon
- Arabidopsis thalianaArabidopsis thalianat0
- Treatment
- Reduction in auxin levels, perception, or signalinge0
- Outcome
- extracellular acidificatione0
- Direction
- abolishese0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Reduction in auxin levels, perception, or signaling abolishes both the extracellular acidification and cellular expansion”
t0“Arabidopsis thaliana”
Claim · model-written summary
Reduced auxin levels, perception or signaling abolish cellular expansion.
- Taxon
- Arabidopsis thalianaArabidopsis thalianat0
- Treatment
- Reduction in auxin levels, perception, or signalinge0
- Outcome
- cellular expansione0
- Direction
- abolishese0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Reduction in auxin levels, perception, or signaling abolishes both the extracellular acidification and cellular expansion”
t0“Arabidopsis thaliana”
Claim · model-written summary
Increased endogenous or exogenous auxin transiently alkalinizes the extracellular matrix.
- Taxon
- Arabidopsis thalianaArabidopsis thalianat0
- Treatment
- increase in auxin levelse0
- Outcome
- alkalinization of the extracellular matrixe0
- Direction
- increasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“an endogenous or exogenous increase in auxin levels induces a transient alkalinization of the extracellular matrix”
t0“Arabidopsis thaliana”
Claim · model-written summary
Increased auxin reduces cellular elongation.
- Taxon
- Arabidopsis thalianaArabidopsis thalianat0
- Treatment
- increase in auxin levelse0
- Outcome
- cellular elongatione0
- Direction
- reducinge0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“an endogenous or exogenous increase in auxin levels induces a transient alkalinization of the extracellular matrix, reducing cellular elongation”
t0“Arabidopsis thaliana”
Claim · model-written summary
FERONIA is required for the auxin-associated physiological process affecting root expansion during gravitropism.
- Taxon
- Arabidopsis thalianaArabidopsis thalianat0
- Organ / stage
- roote0
- Gene
- FERONIAe0
- Outcome
- cellular root expansione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The receptor-like kinase FERONIA is required for this physiological process, which affects cellular root expansion during the gravitropic response”
t0“Arabidopsis thaliana”
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