Pollen grains of stigma of turnip

Pollen grains of stigma of turnip

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Credit: DR JEREMY BURGESS/SCIENCE PHOTO LIBRARY.

Caption: Scanning electron micrograph (SEM) of pollen grains on the stigma of the turnip, Brassica campestris. The stigma is the pollen receiving structure, which together with the ovary, forms the female reproductive organ. In this species it consists of a series of finger-like projections, which impale the pollen grains. At germination, the pollen grows a tube which conveys the male gametes (sperm) down through the stigma, into the ovary & up to the ovule (egg). The tip of the tube ruptures, releasing the sperm to fuse with & fertilize the egg. Mag: X440 at 10x8 inch size.

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Keywords: botany, brassica campestris, flower, nature, plant, plants, pollen, reproduction, reproductive, sem, stigma, turnip, type

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