Fig. 1.

Inflorescences of wild-type and ABC mutants. a) Wild-type (Landsberg erecta). b) ag-3 mutant (C function), closely similar to ag-1 and thus likely to reflect full loss-of-function. c) ap2-2 mutant (A function), an atypical allele with leaf-like sepals. d) ap2-2 mutant with more severe disruptions same as those of several other alleles. e) ap3-1 mutant (B function), with a weak phenotype. f) pi-1 mutant (B function), with a strong phenotype. a–e) modified from Meyerowitz et al. (1989); f) modified from Bowman et al. (1989).