Actin-depolymerizing protein. Severs actin filaments (F-actin) and binds to actin monomers. As root hairs emerges and the microfilament bundles redirect to the outgrowth ADF3 concentrates at the tip of the emerging hair and remains in this position as elongation proceeds. Expressed in all tissues except pollen. Belongs to the actin-binding proteins ADF family.