PIF transcriptional regulators are required for rhythmic stomatal movements

Arnau Rovira, Nil Veciana, Aina Basté-Miquel, Martí Quevedo, Antonella Locascio, Lynne Yenush, Gabriela Toledo-Ortiz, Pablo Leivar and Elena Monte ()
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Arnau Rovira: Campus UAB
Nil Veciana: Campus UAB
Aina Basté-Miquel: Campus UAB
Martí Quevedo: Campus UAB
Antonella Locascio: Universitat Politècnica de València-Consejo Superior de Investigaciones Científicas
Lynne Yenush: Universitat Politècnica de València-Consejo Superior de Investigaciones Científicas
Gabriela Toledo-Ortiz: Errol Road Invergowrie
Pablo Leivar: Universitat Ramon Llull
Elena Monte: Campus UAB

Nature Communications, 2024, vol. 15, issue 1, 1-12

Abstract: Abstract Stomata govern the gaseous exchange between the leaf and the external atmosphere, and their function is essential for photosynthesis and the global carbon and oxygen cycles. Rhythmic stomata movements in daily dark/light cycles prevent water loss at night and allow CO2 uptake during the day. How the actors involved are transcriptionally regulated and how this might contribute to rhythmicity is largely unknown. Here, we show that morning stomata opening depends on the previous night period. The transcription factors PHYTOCHROME-INTERACTING FACTORS (PIFs) accumulate at the end of the night and directly induce the guard cell-specific K+ channel KAT1. Remarkably, PIFs and KAT1 are required for blue light-induced stomata opening. Together, our data establish a molecular framework for daily rhythmic stomatal movements under well-watered conditions, whereby PIFs are required for accumulation of KAT1 at night, which upon activation by blue light in the morning leads to the K+ intake driving stomata opening.

Date: 2024
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DOI: 10.1038/s41467-024-48669-4

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