Actin-depolymerizing protein. Severs actin filaments (F-actin) and binds to actin monomers (PubMed:15563618, PubMed:19794115). Required for normal cell growth, plant development, cell organ expansion and flowering. Essential for root-knot nematode infection (PubMed:19794115). Interacts with AIP1-1. By the root-knot nematode Meloidogyne incognita. Plants silencing ADF2 show net stabilization of F-actin that blocks cell maturation and root-knot nematode development and reproduction. Belongs to the actin-binding proteins ADF family.