Figure 2.

Effects of auxin transport inhibition on fruit-set and growth. A, Effects of NPA on fruit-set and growth of unpollinated (Unpoll.) and pollinated (Poll.) ovaries from MT, MT-D, and MT-SP plants. Data are means ± se (n = 16). B, Images of representative unpollinated and pollinated MT ovaries nontreated and treated with NPA. Mean weight of unpollinated/−NPA and pollinated/+NPA MT ovaries were 12 and 30 mg, respectively. C, Effects of TIBA on fruit-set and growth and number of seeds in unpollinated and pollinated MT ovaries. Data are means ± se (n = 8). Asterisks denote significant differences (P < 0.05) between untreated and treated organs. D, IAA concentration (ng g⁻¹) in unpollinated and pollinated MT ovaries nontreated and treated with NPA. IAA values are means ± se (n = 3, 15 ovaries/fruits per replicate). Different letters on the bars represent means that are statistically different (P < 0.05). NPA and TIBA were applied in lanolin to the pedicel (at 1.5 and 15 mg g⁻¹, respectively) at day 0, and fruits were collected 20 d (A–C) or 10 d (D) later. For meaning of values in parentheses, see legend of Figure 1A. [See online article for color version of this figure.]