The succinate dehydrogenase complex catalyzes the reaction of succinate and ubiquinone to form fumarate and ubiquinol. The electrons yielded in this reaction ultimately enter mitochondrial electron transport via FAD. The rice complex has not been studied experimentally; the identities of its components are inferred by homology from those of the better-studied Arabidopsis thaliana complex (Figueroa et al. 2001, 2002).