Figure 4.

Effects of GA₃ and PAC application to wild-type (WT) and pro plants. A, Wild-type control and GA₃-treated plants compared with pro plants. B, Morphology of the fifth leaf (from the cotyledons) of nontreated and GA₃-treated plants. C, Flower morphology and size of pistils from plants treated with GA₃ and PAC. D, Effects of GA₃, IAA, and 2,4-D on the style elongation of wild-type pistils. The pistils were treated with hormone solutions on day −5 after removing stamens and petals, and style length was measured on day 0. Final means ± se of style lengths (mm) were as follows: mock, 3.8 ± 0.2; +GA₃, 4.7 ± 0.1*; +IAA, 5.3 ± 0.2**; +2,4-D, 6.1 ± 0.2** (n = 7; *P < 0.05, **P < 0.01). E, Effect of continuous GA₃ application to plants on the morphology of representative fruits displaying additional fruit-like structures. F, Wild-type and pro plants untreated and treated with PAC. [See online article for color version of this figure.]