Abstract
Root water uptake is influenced by root system architecture, which is determined by root growth and branching and the hydraulics of root cells and tissues. The phytohormone abscisic acid (ABA) plays a major role in the adaptation of plants to water deficit (WD). Here we addressed at the whole-root level in Arabidopsis (Arabidopsis thaliana) the regulatory role of ABA in mechanisms that determine root hydraulic architecture. Root system architecture and root hydraulic conductivity (Lpr) were analyzed in hydroponically grown plants subjected to varying degrees of WD induced by various polyethylene glycol (PEG) concentrations. The majority of root traits investigated, including first- and second-order lateral root production and elongation and whole-root hydraulics, had a bell-shaped dependency on WD, displaying stimulation under mild WD conditions (25 g PEG L−1) and repression under more severe conditions. These traits also showed a bell-shaped dependency on exogenous ABA, and their regulation by WD was attenuated in genotypes altered in ABA biosynthesis and response. Thus, we propose that ABA acts as a coordinator and an integrator of most root responses to mild and moderate WD, whereas responses to strong WD (150 g PEG L−1) are largely ABA independent. We also found that roots exhibit different growth responses to both WD and ABA depending on their rank and age. Taken together, our results give further insights into the coordinated water acquisition strategies of roots deployed in relation to WD intensity.
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Claims 7
Claim · model-written summary
Mild water deficit stimulated lateral root production, elongation, and whole-root hydraulics.
- Taxon
- Arabidopsis
Arabidopsise0 - Treatment
- mild WD conditions (25 g PEG L−1)e1
- Outcome
- first- and second-order lateral root production and elongation and whole-root hydraulicse1
- Direction
- stimulatione1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Arabidopsis (Arabidopsis thaliana)”
e1“first- and second-order lateral root production and elongation and whole-root hydraulics, had a bell-shaped dependency on WD, displaying stimulation under mild WD conditions (25 g PEG L−1)”
Claim · model-written summary
More severe water deficit repressed lateral root production, elongation, and whole-root hydraulics.
- Taxon
- ArabidopsisArabidopsise0
- Treatment
- more severe conditionse1
- Outcome
- first- and second-order lateral root production and elongation and whole-root hydraulicse1
- Direction
- repressione1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Arabidopsis (Arabidopsis thaliana)”
e1“first- and second-order lateral root production and elongation and whole-root hydraulics, had a bell-shaped dependency on WD, displaying stimulation under mild WD conditions (25 g PEG L−1) and repression under more severe conditions”
Claim · model-written summary
Root traits had a bell-shaped response to exogenous ABA.
- Taxon
- ArabidopsisArabidopsise0
- Treatment
- exogenous ABAe1
- Outcome
- These traitse1
- Direction
- bell-shapede1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Arabidopsis (Arabidopsis thaliana)”
e1“These traits also showed a bell-shaped dependency on exogenous ABA”
Claim · model-written summary
Altered ABA biosynthesis and response attenuated regulation of root traits by water deficit.
- Taxon
- ArabidopsisArabidopsise0
- Treatment
- genotypes altered in ABA biosynthesis and responsee1
- Outcome
- their regulation by WDe1
- Direction
- attenuatede1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Arabidopsis (Arabidopsis thaliana)”
e1“their regulation by WD was attenuated in genotypes altered in ABA biosynthesis and response”
Claim · model-written summary
Authors propose ABA coordinates most root responses to mild and moderate water deficit.
- Taxon
- ArabidopsisArabidopsise0
- Compound
- ABAe1
- Outcome
- root responses to mild and moderate WDe1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Arabidopsis (Arabidopsis thaliana)”
e1“ABA acts as a coordinator and an integrator of most root responses to mild and moderate WD”
Claim · model-written summary
Strong water deficit responses were largely ABA independent.
- Taxon
- ArabidopsisArabidopsise0
- Compound
- ABAe1
- Outcome
- responses to strong WD (150 g PEG L−1)e1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Arabidopsis (Arabidopsis thaliana)”
e1“responses to strong WD (150 g PEG L−1) are largely ABA independent”
Claim · model-written summary
Root growth responses to water deficit and ABA differed by root rank and age.
- Taxon
- ArabidopsisArabidopsise0
- Organ / stage
- rootse1
- Treatment
- WD and ABAe1
- Outcome
- growth responsese1
- Direction
- differente1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Arabidopsis (Arabidopsis thaliana)”
e1“roots exhibit different growth responses to both WD and ABA depending on their rank and age”
The same questions in other papers
drought · yield · ArabidopsisPositive and negative results
1 paper in the same direction as this paper · 1 in the opposite direction
- no effect
- 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.