Actin-Depolymerizing Factors 8 and 11 Promote Root Hair Elongation at High pH

The study explores the role of actin-depolymerizing factors ADF8 and ADF11 in root hair elongation in Arabidopsis thaliana under high pH conditions. It reveals that while high pH typically inhibits the elongation rate, it extends the elongation duration, resulting in longer root hairs. ADF8 and ADF11 are crucial for maintaining the F-actin meshwork at root hair tips, which is essential for proper vesicle transport and root hair growth. The absence of these factors leads to disrupted actin filament organization and impaired vesicle trafficking, resulting in shorter root hairs. The research utilized CRISPR-Cas9 gene editing and live-cell imaging to demonstrate that ADF8 and ADF11 function redundantly to regulate root hair growth in response to environmental pH changes.