Figure 3.

Effect of GA on Pollen Tube Elongation.

Growth of pollen from rpe1 ([A] to [D]) on its own stigmas that were left treated with mock ([A] and [C]) or with GA₄ ([B] and [D]). Pollen grains were stained with aniline blue at 30 min ([A] and [B]) or 2 h ([C] and [D]) after artificial pollination. Emasculated wild-type flowers with stamens removed were pretreated with GA₄ for 30 min before pollination. Arrowhead indicates pollen elongation. Bars = 200 μm.