ROP2 — Arabidopsis thaliana

Summary

AT1G20090 (ROP2) of Arabidopsis thaliana encodes a RAC-like GTP-binding protein (ARAC4) belonging to the small GTPase Rho family. The product exhibits multiple molecular functions including GDP binding, GTPase binding, GAP binding, G actin binding, phosphatidylinositol kinase activity, and protein prenyltransferase activities. ROP2 is associated with isotropic cell growth, cell polarization, regulation of morphogenesis, regulation of actin polymerization or depolymerization, cytoplasmic microtubule organization, SNARE complex assembly, regulation of calcium-mediated signaling, reactive oxygen species anabolism, and protein geranylgeranylation. It localizes to the filiform apparatus, pollen tube tip, apical plasma membrane, site of polarized growth, SCAR complex, and secondary cell wall. The gene is associated with waterlogging tolerance, and has been linked to numerous traits including petal length, leaf lamina morphology, seed weight, yield, root branching, lateral root number, root hair length, auxin content, abscisic acid concentration, cadmium concentration, starch content, and phyllotaxy.