Proteomics

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

ABSTRACT: 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 study, we identified WD-repeat protein 48 (WDR48), which is essential for starch degradation. Phosphoproteome analysis revealed that WDR48 was phosphorylated in response to blue light. Mutation of WDR48 impaired starch degradation and stomatal opening by blue light. Phototropins interacted with and phosphorylated WDR48. WDR48 and BLUS1 constituted separate signalling pathways required for starch degradation. We propose that the coordinated control of starch synthesis by red light and its degradation by blue light signalling through WDR48 and BLUS1 is a key mechanism for stomatal opening by red and blue light.

ORGANISM(S): Arabidopsis Thaliana (mouse-ear Cress)

SUBMITTER: Atsushi Takemiya 

PROVIDER: PXD073138 | JPOST Repository | Wed Feb 18 00:00:00 GMT 2026

REPOSITORIES: jPOST

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240511NS01WT_RL.raw Raw
240511NS02WT_BL.raw Raw
240511NS03p1p2_RL.raw Raw
240511NS04p1p2_BL.raw Raw
240511NS07WT_RL.raw Raw
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Publications

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<sup>+</sup>-ATPase through phosphorylation of BLUS1 by phototropins, thus promoting stomatal opening. However, how phototropins mediate starch degradation remains unclear. In this study, we identified WD-repeat protein 48 (WDR48), which is essential for star  ...[more]

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