Figure 4.

Pollination-induced silique and embryo development in a FIS1/fis1 heterozygote and a fis1/fis1 homozygote. (A) Torpedo stage Gus-positive (blue) embryos resulting from the pollination of a pi/pi FIS/FIS homozygous plant with a plant homozygous for a ³⁵S-Gus construct. (B) Torpedo stage Gus-positive (blue) and Gus-negative (white, arrow) embryos from the pollination of a fis1/fis1 homozygote with pollen from plants carrying a ³⁵S-Gus construct. (C) Silique development after self-pollination of (1) fis1/fis1, (2) FIS1/fis1, and (3) FIS1/FIS1 plants.