Does the plant clock gate auxin responses?

The Arabidopsis circadian clock regulates auxin-responsive transcription and gates growth responses to auxin.

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How does the clock affect auxin transcription?

It regulates transcriptional responses to endogenous and exogenous auxin.

Is auxin-driven growth gated by the clock?

Yes—plant growth responses to exogenous auxin are gated by the clock.

What fraction of seedling genes cycle in their estimate?

Over 10% of expressed genes show circadian transcript rhythms.

Are auxin-induced genes enriched for clock regulation?

Yes—more than expected by chance.

What classic physiological observation do they revisit?

Went and Thimann noted auxin sensitivity varies with time of day, peaking early morning.

How many nuclear genes showed circadian mRNA fluctuations?

Over 1,600 nuclear-encoded genes.

What hormone pathway is the focus of clock intersection?

Auxin signaling.

Model organism?

Arabidopsis seedlings.

What does enrichment of auxin-induced genes among clock genes suggest?

That the circadian clock might modulate auxin signaling.

Is the 10% estimate likely an underestimate?

Authors say yes—some auxin-induced genes look rhythmic but were classified noncircadian.

Core teaching point?

Clocks can gate hormone responsiveness, not only hormone levels.