Has a glutathione-disulfide oxidoreductase activity in the presence of NADPH and glutathione reductase. Reduces low molecular weight disulfides and proteins (By similarity). Involved in flower development. Interacts with TGA9 and TGA10 in the nucleus. Weakly expressed throughout the inflorescence apical meristem and in young buds (PubMed:18036205). Localized to the tapetum and middle layers (PubMed:20805327). No visible phenotype. Defection in sporogenous cell formation in adaxial anther lobes when associated with the disruption of GRXC7/ROXY1 leading to fertility defects. Belongs to the glutaredoxin family. CC-type subfamily. Truncated N-terminus.