Involved in basal disease resistance to bacterial blight (X.oryzae). May act as positive regulator of basal defense. Probably required for SCF-mediated ubiquitination, by coupling HSP90 to SCF complex for ubiquitination of HSP90 client proteins. Interacts (via CS domain) with RAR1 (via CHORD 2 domain). Interacts with RAD6. Expressed in roots, root tips, shoot apical meristem (SAM), young leaves, flag leaves and ears. By hydrogen peroxide. Belongs to the SGT1 family.