Abstract
Drought stress is a major problem for agriculture worldwide, causing significant yield losses. Plants have developed highly flexible mechanisms to deal with drought, including organ- and developmental stage-specific responses. In young leaves, growth is repressed as an active mechanism to save water and energy, increasing the chances of survival but decreasing yield. Despite its importance, the molecular basis for this growth inhibition is largely unknown. Here, we present a novel approach to explore early molecular mechanisms controlling Arabidopsis leaf growth inhibition following mild drought. We found that growth and transcriptome responses to drought are highly dynamic. Growth was only repressed by drought during the day, and our evidence suggests that this may be due to gating by the circadian clock. Similarly, time of day strongly affected the extent, specificity, and in certain cases even direction of drought-induced changes in gene expression. These findings underscore the importance of taking into account diurnal patterns to understand stress responses, as only a small core of drought-responsive genes are affected by drought at all times of the day. Finally, we leveraged our high-resolution data to demonstrate that phenotypic and transcriptome responses can be matched to identify putative novel regulators of growth under mild drought.
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Claims 7
Claim · model-written summary
Growth responses to drought were highly dynamic.
- Taxon
- Arabidopsis
Arabidopsist0 - Outcome
- growthe0
- Qualifier
- highly dynamice0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“We found that growth and transcriptome responses to drought are highly dynamic.”
t0“Arabidopsis”
Claim · model-written summary
Transcriptome responses to drought were highly dynamic.
- Taxon
- ArabidopsisArabidopsist0
- Outcome
- transcriptome responses to droughte0
- Qualifier
- highly dynamice0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“We found that growth and transcriptome responses to drought are highly dynamic.”
t0“Arabidopsis”
Claim · model-written summary
Drought repressed Arabidopsis growth only during the day.
- Taxon
- ArabidopsisArabidopsist0
- Treatment
- droughte0
- Outcome
- Growthe0
- Direction
- repressede0
- Qualifier
- during the daye0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Growth was only repressed by drought during the day”
t0“Arabidopsis”
Claim · model-written summary
Circadian clock gating may explain daytime growth repression by drought.
- Taxon
- ArabidopsisArabidopsist0
- Outcome
- Growth was only repressed by drought during the daye1
- Qualifier
- gating by the circadian clocke0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“our evidence suggests that this may be due to gating by the circadian clock.”
e1“Growth was only repressed by drought during the day”
t0“Arabidopsis”
Claim · model-written summary
Time of day strongly affected the extent, specificity and sometimes direction of drought induced gene expression changes.
- Taxon
- ArabidopsisArabidopsist0
- Treatment
- droughte0
- Outcome
- drought-induced changes in gene expressione0
- Qualifier
- time of daye0
Not reportedSettingDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“time of day strongly affected the extent, specificity, and in certain cases even direction of drought-induced changes in gene expression.”
t0“Arabidopsis”
Claim · model-written summary
Only a small core of drought responsive genes responded at all times of day.
- Taxon
- ArabidopsisArabidopsist0
- Gene
- drought-responsive genese0
- Outcome
- drought-responsive genes are affected by drought at all times of the daye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“only a small core of drought-responsive genes are affected by drought at all times of the day.”
t0“Arabidopsis”
Claim · model-written summary
Matching phenotype and transcriptome responses identified putative novel regulators of growth under mild drought.
- Taxon
- ArabidopsisArabidopsist0
- Outcome
- identify putative novel regulators of growth under mild droughte0
Not reportedComparatorValue
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“phenotypic and transcriptome responses can be matched to identify putative novel regulators of growth under mild drought.”
t0“Arabidopsis”
The same questions in other papers
drought · growth · ArabidopsisPositive and negative results
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