Fig. 2. Effect of ectopic expression of AmMYBML2, AtMYB16 and PhMYB1 on epidermal cells. (A-D) SEM micrographs of conical inner epidermal cells of wild-type tobacco petal limb (A), and of tobacco petals transformed with 2x35S::AmMYBML2 (B), 2x35S::PhMYB1 (C), or 2x35S::AtMYB16 (D). The activity of each of the three genes causes the inner epidermal petal cells to grow to a greater length than the wild-type cells. (E,F) Micrographs of carpel epidermis of wild-type tobacco (E) and of cellular outgrowths on tobacco carpels transformed with 2x35S::PhMYB1 (F); tobacco carpels overexpressing AmMYBML2 or AtMYB16 have the same phenotype (not shown). (G,H) Micrographs of conical inner epidermal cells of wild-type Arabidopsis thaliana petals (G), and of petals transformed with 2x35S::AtMYB16 (H), where the cells grew to a greater length than in wild-type. Scale bars: 20 µm.