Fig. 1.

Mature pollen phenotypes of gem2. Panels show light micrographs and fluorescence images of DAPI stained material. A, gem2 population, with aberrant pollen indicated with arrowheads. B, DAPI staining of the same population. C-I, pollen phenotypic classes. C, morphologically normal pollen in gem2 with one diffusely-stained vegetative nucleus and two intensely-stained sperm nuclei. D, E, equal or unequally divided pollen. F, G, uninucleate and binucleate pollen with internal dividing walls. H, I, binucleate and uninucleate pollen showing failed cytokinesis