Pollen of Morning Glory flower

Pollen of Morning Glory flower

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Caption: False-colour scanning electron micrograph of a pollen grain of Morning Glory, Ipomoea learii. The grain is about 146 micrometres across. It has a highly sculptured outer wall (exine) consisting of crater-like germinal pores surrounded by spine- covered ridges. The spines enable the pollen to adhere to the body hairs of insects & so be transferred to other flowers. When the pollen grain, containing the male gametes, lands on the stigma of a flower, it germinates. A pollen tube grows out of one of the pores, down through the stigma, to the ovary. The male nuclei pass down the tube, fertilize the ovules & a seed is formed. Magnification: x165 at 35mm size. Original is BW print B786/160.

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Keywords: botany, ipomoea learii, morning glory, nature, plant, plants, pollen, reproduction, reproductive, type

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