
Arabidopsis thaliana male gametophyte (pollen grain). (A) Schematic representation of a mature pollen grain, which contains two sperm cells enclosed in the cytoplasm of a vegetative cell. Characteristics of the vegetative cell include a large vacuole and nucleus. The pollen coat is composed of an external layer (the exine) and an internal layer (the intine). (B) DNA staining with DAPI (diamidino-2-phenylindole) showing the vegetative nucleus and two sperm nuclei. (C) Purity of mature pollen grains collected on the 6-μm mesh. Scale bars, 10 μm.











