Dynamics of Actin Filaments Play an Important Role in Root Hair Growth Under Low Potassium Stress in Arabidopsis Thaliana

The study investigates the role of actin filament dynamics in root hair growth of Arabidopsis thaliana under low potassium (K+) stress. It was found that root hairs grow faster and longer under low K+ conditions, with actin filaments in the sub-apex being longer and more parallel. The actin bundling proteins Villin1 (VLN1) and Villin4 (VLN4) were differentially regulated, with VLN1 inhibited and VLN4 induced under low K+ stress, affecting actin filament bundling and length. These findings highlight the importance of actin filament dynamics in root hair adaptation to low K+ stress, providing insights into the molecular mechanisms involved. The study involved over 60 plants, ensuring robust data.