Germination of two pollen grains on the surface of the stigma of the wild mustard flower (Brassica sp.) The pollen grains, which contain the male gametes, are transferred to the sticky stigma of the female flower by insects or wind. Pollen tubes are seen growing out of the two pollen grains. They grow through the stigma, down the style, enter the ovary and approach the ovule (egg). The male nuclei (gametes) travel down the pollen to fertilize the ovules, resulting in seed formation.

Image and text copyright © Dennis Kunkel. All rights reserved.

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