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PIF transcriptional regulators are required for rhythmic stomatal movements
Arnau Rovira1, Nil Veciana1, Aina Basté-Miquel1
1Centre for Research in Agricultural Genomics (CRAG) CSIC-IRTA-UAB-UB, Campus UAB, Bellaterra, Barcelona, Spain.
Nature Communications
|May 29, 2024
Summary
Morning stomatal opening relies on nighttime PHYTOCHROME-INTERACTING FACTORS (PIFs) accumulation. These PIFs induce the KAT1 channel, which blue light then activates for stomatal opening and CO2 uptake.
Area of Science:
- Plant physiology
- Molecular biology
- Biochemistry
Background:
- Stomata regulate gas exchange critical for photosynthesis and global carbon/oxygen cycles.
- Daily rhythmic stomatal movements optimize water conservation and CO2 uptake.
- Transcriptional regulation of stomatal rhythmicity remains largely uncharacterized.
Purpose of the Study:
- Investigate the molecular mechanisms underlying daily rhythmic stomatal opening.
- Elucidate the role of transcription factors in regulating stomatal movements.
- Establish a framework for understanding how nighttime events influence morning stomatal function.
Main Methods:
- Analysis of gene expression patterns related to stomatal function.
- Investigating the role of PHYTOCHROME-INTERACTING FACTORS (PIFs) in guard cells.
- Studying the function of the K+ channel KAT1 in stomatal opening.
Main Results:
- PHYTOCHROME-INTERACTING FACTORS (PIFs) accumulate at the end of the night.
- PIFs directly induce the expression of the guard cell-specific K+ channel KAT1.
- PIFs and KAT1 are essential for blue light-induced stomatal opening, demonstrating a link between nighttime PIF accumulation and morning K+ influx.
Conclusions:
- A molecular framework for daily rhythmic stomatal movements is established.
- Nighttime PIF accumulation is crucial for KAT1 accumulation.
- Blue light activation of KAT1, driven by PIFs, facilitates morning stomatal opening and CO2 uptake.
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