Pollen from the pot marigold

Pollen from the pot marigold

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Credit: DR JEREMY BURGESS/SCIENCE PHOTO LIBRARY

Caption: False-colour scanning electron micrograph of a pollen grain of the pot marigold Calendula officinalis. The surface of the pollen grain is covered with tiny barbs, which secure it to the body of an insect for transportation and subsequently to the surface of the stigma at the start of fertilization. One of the furrows, visible here along the length of the grain, will produce a slender tube, called a pollen tube, which will grow down to the ovary. Inside the pollen tube, two sperms follow its growth. When the egg is reached, the tube bursts, releasing the sperm, one of which will fertilise the egg. Magnification: x900 at 6x4.5cm size.

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Keywords: botany, calendula officinalis, calendula sp., nature, plant, plants, pollen, reproduction, reproductive, sem, type

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