Overview of G Proteins (GTP binding proteins) in Eukaryotes -- Overview of Small GTPase Signaling Proteins in Plants --  Identification and Classification of Rho GTPases in Plants -- Sequence, Structure and Domain Analysis of GTPases in Plants -- Expression of Small GTPases Under Stress and Developmental Conditions in Plants -- Emerging Roles of Rho GTPases in Plants -- Cellular Localization of Small GTPases -- Functional Genomic Perspective of Small GTPases -- Systemic Approaches to Resolve Spatio-Temporal Regulation of GTPase Signaling -- Key Questions and Future Prospects.