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Updated: Nov 6, 2025

Chromatin Immunoprecipitation Assay for the Identification of Arabidopsis Protein-DNA Interactions In Vivo
Published on: January 14, 2016
Phytochrome interacting factor proteins regulate cytokinesis in Arabidopsis
Yuanyuan Zhang1, Na Li2, Lei Wang2
1Key Laboratory of Plant Molecular Physiology, CAS Center for Excellence in Molecular Plant Sciences, Institute of Botany, Chinese Academy of Sciences, Beijing 100093, China.
Phytochromobilin interacting factors (PIF) proteins regulate plant apical hook opening by controlling cell division (cytokinesis) through Budding Uninhibited by Benzimidazole 3.1 (BUB3.1). This reveals a key mechanism in plant development.
Area of Science:
- Plant Biology
- Developmental Biology
- Molecular Genetics
Background:
- Dicotyledonous plants form an apical hook for protection during soil emergence.
- Mutant etiolated pifq seedlings exhibit an open apical hook, indicating PIF proteins' role.
Purpose of the Study:
- To elucidate the mechanism by which PIF proteins regulate apical hook opening.
- To investigate the role of Budding Uninhibited by Benzimidazole 3.1 (BUB3.1) in this process.
Main Methods:
- Analysis of etiolated pifq seedlings.
- Gene expression analysis of BUB3.1.
- Cytokinesis assays including phragmoplast formation and DNA staining.
- Flow cytometry for endoreduplication levels.
- Chemical treatment with caffeine.
Main Results:
- PIF proteins regulate apical hook opening by controlling BUB3.1 expression and cytokinesis.
- Phragmoplasts are well-formed in pifq mutants, unlike wild type.
- Endoreduplication levels are reduced in pifq mutants.
- Caffeine treatment affects apical hook opening, confirming cytokinesis involvement.
- BUB3.1 is genetically epistatic to PIFq in regulating cytokinesis.
Conclusions:
- PIF proteins regulate cytokinesis via BUB3.1 during apical hook development.
- This study uncovers an organ-specific function of PIF proteins in controlling cell division for plant morphogenesis.
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