Responses of selected mutant and wild-type seedlings on spectinomycin. A, Parental Columbia accession. B, toc34-1 (ppi3-2). C, tic20-IV-1 (SAIL_97_F10). D, tic20-IV-2 (Koncz 11324). E, acc2-1 (Salk_148966c). F, Most sensitive accession (Sav-0) identified in the initial screen. Bar = 1 mm.