Does the plant clock gate auxin responses?
The Arabidopsis circadian clock regulates auxin-responsive transcription and gates growth responses to auxin.
Source
The circadian clock regulates auxin signaling and responses in Arabidopsis
Study at a glance
- Design
- Animal / in-vitro — Circadian transcriptomes overlapped with auxin responses; timed auxin transcriptional/growth assays
- N
- Arabidopsis seedling genome-wide profiling — no single organismal N in stored text
- Population
- Arabidopsis thaliana seedlings
- Outcome
- Clock gating of auxin transcriptional responses and growth
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Inspect source passages
Does the plant clock gate auxin responses?
These passages occur verbatim in the stored paper text. They support the points listed below; they do not verify every statement in the explanation.
Over 10% of expressed Arabidopsis seedling genes are circadian regulated
Using genome-wide transcriptional profiling, we found that over 10% of genes expressed in Arabidopsis seedlings are circadian regulated at the level of transcript abundance.
How does the clock affect auxin transcription?
Indeed, we show that transcriptional responses to both endogenous and exogenous auxin are regulated by the circadian clock.
What they did
Profiled circadian transcriptomes and tested overlaps with auxin-regulated genes, then assayed transcriptional and growth responses to auxin across the day.
What they found
>10% of seedling genes cycle; auxin-induced genes are enriched for clock regulation; endogenous/exogenous auxin transcriptional responses and auxin-driven growth are clock-gated.
The limits
What it doesn't show
Does not fully map every clock–auxin molecular node in all tissues or prove clinical relevance outside plants.
Key terms
- Circadian clock
- Endogenous ~24 h timing system coordinating physiology.
- Auxin
- Plant hormone controlling growth and development.
- Gating
- Time-of-day restriction of response amplitude to a stimulus.
- Transcriptional profiling
- Genome-wide measurement of mRNA abundance over time.
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Quiz yourself
Clock effect on auxin transcription:
Common questions
Are auxin genes clock-enriched?
Yes—more than expected by chance.
Is growth gated?
Yes—responses to exogenous auxin are clock-gated.
How many genes cycle?
Over 10% of expressed seedling genes in their estimate.
Organism?
Arabidopsis.
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