Abstract
The root is in direct contact with soil. Modulation of root growth in response to alterations in soil conditions is pivotal for plant adaptation. Extensive research has been conducted concerning the adjustment of root elongation and architecture in response to environmental factors. However, little is known about the modulation of the root growth trajectory, as well as its hormonal mechanism. Here we report that abscisic acid (ABA) participated in controlling root growth trajectory. The roots upon ABA treatment or from ABA-accumulation double mutant cyp707a1,3 exhibit agravitropism-like growth pattern (wavy growth trajectory). The agravitropism-like phenotype is mainly ascribed to the compromised shootward transportation of auxin since we detected a reduced fluorescence intensity of auxin reporter DR5:VENUS in the root epidermis upon exogenous ABA application or in the endogenous ABA-accumulation double mutant cyp707a1,3 . We then tried to decipher the mechanism by which ABA suppressed shootward auxin transport. The membrane abundance of PIN2, a facilitator of shootward auxin transport, was significantly reduced following ABA treatment and in cyp707a1,3 . Finally, we revealed that ABA reduced the membrane PIN2 intensity through suppressing the PIN2 expression rather than accelerating PIN2 degradation. Ultimately, our results suggest a pivotal role for ABA in the root growth trajectory and the hormonal interactions orchestrating this process.
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Claims 8
Claim · model-written summary
ABA treatment produced wavy, agravitropism like root growth.
- Taxon
- Arabidopsis thaliana
Arabidopsis thalianat0 - Organ / stage
- rootse0
- Treatment
- ABA treatmente0
- Outcome
- agravitropism-like growth pattern (wavy growth trajectory)e0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The roots upon ABA treatment or from ABA-accumulation double mutant cyp707a1,3 exhibit agravitropism-like growth pattern (wavy growth trajectory)”
t0“Arabidopsis thaliana”
Claim · model-written summary
The ABA accumulation mutant displayed wavy roots.
- Taxon
- Arabidopsis thalianaArabidopsis thalianat0
- Material
- cyp707a1,3e0
- Outcome
- agravitropism-like growth pattern (wavy growth trajectory)e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“ABA-accumulation double mutant cyp707a1,3 exhibit agravitropism-like growth pattern (wavy growth trajectory)”
t0“Arabidopsis thaliana”
Claim · model-written summary
ABA treatment reduced auxin reporter fluorescence in root epidermis.
- Taxon
- Arabidopsis thalianaArabidopsis thalianat0
- Organ / stage
- root epidermise0
- Treatment
- exogenous ABA applicatione0
- Outcome
- fluorescence intensity of auxin reporter DR5:VENUSe0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“reduced fluorescence intensity of auxin reporter DR5:VENUS in the root epidermis upon exogenous ABA application”
t0“Arabidopsis thaliana”
Claim · model-written summary
The ABA accumulation mutant showed reduced auxin reporter fluorescence.
- Taxon
- Arabidopsis thalianaArabidopsis thalianat0
- Material
- cyp707a1,3e0
- Outcome
- fluorescence intensity of auxin reporter DR5:VENUSe0
- Direction
- reducede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“reduced fluorescence intensity of auxin reporter DR5:VENUS in the root epidermis upon exogenous ABA application or in the endogenous ABA-accumulation double mutant cyp707a1,3”
t0“Arabidopsis thaliana”
Claim · model-written summary
ABA treatment significantly reduced membrane PIN2 abundance.
- Taxon
- Arabidopsis thalianaArabidopsis thalianat0
- Treatment
- ABA treatmente0
- Gene
- PIN2e0
- Outcome
- membrane abundance of PIN2e0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The membrane abundance of PIN2, a facilitator of shootward auxin transport, was significantly reduced following ABA treatment”
t0“Arabidopsis thaliana”
Claim · model-written summary
The ABA accumulation mutant also had significantly reduced membrane PIN2.
- Taxon
- Arabidopsis thalianaArabidopsis thalianat0
- Material
- cyp707a1,3e0
- Gene
- PIN2e0
- Outcome
- membrane abundance of PIN2e0
- Direction
- reducede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The membrane abundance of PIN2, a facilitator of shootward auxin transport, was significantly reduced following ABA treatment and in cyp707a1,3”
t0“Arabidopsis thaliana”
Claim · model-written summary
ABA reduced membrane PIN2 by suppressing PIN2 expression.
- Taxon
- Arabidopsis thalianaArabidopsis thalianat0
- Gene
- PIN2e0
- Compound
- ABAe0
- Outcome
- membrane PIN2 intensitye0
- Direction
- reducede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“ABA reduced the membrane PIN2 intensity through suppressing the PIN2 expression”
t0“Arabidopsis thaliana”
Claim · model-written summary
PIN2 degradation acceleration did not explain the ABA response.
- Taxon
- Arabidopsis thalianaArabidopsis thalianat0
- Gene
- PIN2e0
- Outcome
- PIN2 degradatione0
- Qualifier
- rather than acceleratinge0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“rather than accelerating PIN2 degradation”
t0“Arabidopsis thaliana”
The same questions in other papers
(+)-abscisic acid · pest · Arabidopsis thaliana (thale cress)Positive and negative results
2 in the opposite direction
- positive
- positive
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.