Pollen grain of Leucospermum flower

Pollen grain of Leucospermum 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 Leucospermum sp. , a member of the Proteaceae family. Three germinal apertures are visible at the apices of the triangular form of this pollen grain. It is through one of these apertures that the pollen tube emerges during germination, after the pollen grain (containing the male sex cell) has landed on the stigma of a flower. The pollen tube grows down the stigma and into the ovary, giving the male nuclei access to the ovules & allowing fertilisation to take place. Magnification: x3000 at 6x7cm size.

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Keywords: botany, leucospermum, leucospermum sp., nature, plant, plants, pollen, protea, reproduction, reproductive, type

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