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Article

Phosphorylation of WDR48 by phototropins drives starch degradation to promote stomatal opening.

Nature communications - 6 Mar 2026

Yamauchi Shota, Fuji Saashia, Ikuta Hiroki, Sugiyama Naoyuki, Kodama Yutaka, Distefano Luca, Fujii Haruki, Yamashita Kota, Takase Hinano, Nomoto Mika, Tada Yasuomi, Umezawa Taishi, Hotta Kazuhiro, Santelia Diana, Shimazaki Ken-Ichiro, Takemiya Atsushi

Abstract excerpt

Plant stomata open in response to blue light under a background of red light. Red light induces starch accumulation through guard cell photosynthesis, whereas blue light causes rapid starch degradation via the activation of plasma membrane H+-ATPase through phosphorylation of BLUS1 by phototropins, thus promoting stomatal opening. However, how phototropins mediate starch degradation remains unclear. In this...

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Arabidopsis
Arabidopsis Proteins
Light
Phosphorylation
Phosphotransferases

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Signal Transduction

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PMID: 41792178
DOI: 10.1038/s41467-026-70314-5
PMCID: PMC13096123

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Phosphorylation of WDR48 by phototropins drives starch degradation to promote stomatal opening.PMID 41792178Read ↗

A BLUS1 kinase signal and a decrease in intercellular CO2 concentration are necessary for stomatal opening in response to blue light.Semantic proximity Read ↗

Phosphorylation of BLUS1 kinase by phototropins is a primary step in stomatal opening.Semantic proximity Read ↗

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Brassinosteroid and Hydrogen Peroxide Interdependently Induce Stomatal Opening by Promoting Guard Cell Starch Degradation.Semantic proximity Read ↗

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