Pollen from Iris flower

Pollen from Iris flower

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Credit: J.C. REVY, ISM/SCIENCE PHOTO LIBRARY

Caption: False-colour scanning electron micrograph (SEM) of a single pollen grain of Iris unguicularus. Its outer wall (exine) is composed of a network of ridges and blebs. The deep groove running along the centre of the pollen grain is called the germinal furrow. When the pollen grain, containing the male gametes, lands on the stigma of a flower, it germinates. A pollen tube grows out of the furrow, down through the stigma, to the ovary. The male nuclei pass down the tube, fertilize the ovules & a seed is formed. Magnification: x1880 at 6x7cm size.

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Keywords: botany, iridaceae, iris, iris unguicularis, nature, plant, plants, pollen, reproduction, reproductive, type

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