ArticleJournal of integrative plant biology2024
MYB52 negatively regulates ADF9-meditated actin filament bundling in Arabidopsis pavement cell morphogenesis.
Article in Journal of integrative plant biology, 2024. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 3 papers.
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3 citing papers in PubMed.
- Systematic Analysis of theLife (Basel, Switzerland) · 2026Article
- Transcription Factor BnaC04.MYB89 Negatively Regulates Seed Fatty Acid Biosynthesis inPlants (Basel, Switzerland) · 2025Article
- MYB52 negatively regulates ADF9-meditated actin filament bundling in Arabidopsis pavement cell morphogenesis.Journal of integrative plant biology · 2024Article
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7 authors.
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Abstract
It has been proposed that cortical fine actin filaments are needed for the morphogenesis of pavement cells (PCs). However, the precise role and regulation mechanisms of actin filaments in PC morphogenesis are not well understood. Here, we found that Arabidopsis thaliana ACTIN DEPOLYMERIZING FACTOR9 (ADF9) is required for the morphogenesis of PC, which is negatively regulated by the R2R3 MYELOBLASTOSIS (MYB) transcription factor MYB52. In adf9 mutants, the lobe number of cotyledon PCs was significantly reduced, while the average lobe length did not differ significantly compared to that of wild type (Col-0), except for the variations in cell area and circularity, whereas the PC shapes in ADF9 overexpression seedlings showed different results. ADF9 decorated actin filaments, and colocalized with plasma membrane. The extent of filament bundling and actin filament bundling activity in adf9 mutant decreased. In addition, MYB52 directly targeted the promoter of ADF9 and negatively regulated its expression. The myb52-2 mutant showed increased lobe number and cell area, reduced cell circularity of PCs, and the PC phenotypes were suppressed when ADF9 was knocked out. Taken together, our data demonstrate that actin filaments play an important role in the morphogenesis of PC and reveal a transcriptional mechanism underlying MYB52 regulation of ADF9-mediated actin filament bundling in PC morphogenesis.
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