Genetic complementation of the Arabidopsis ttg1-9 mutant. A, Leaves of the ttg1-9 mutant line. B, Leaves of the ttg1-9 mutant expressing 35S∷MtWD40-1. C, Seed coat pigmentation of the wild type, ttg1-9, and ttg1-9 expressing 35S∷MtWD40-1. D, A single leaf of ttg1-9 showing the glabrous phenotype. E, A single leaf of the ttg1-9 mutant expressing GL2∷MtWD40-1 showing the restoration of the trichome phenotype. F, Seed coat pigmentation of the wild type, ttg1-9, and ttg1-9 expressing GL2∷MtWD40-1. G, Yeast two-hybrid analysis of the interaction between MtWD40-1 and Arabidopsis GL3 (see text for details).