Explained: Process of Germination of Pollen on Stigma

Process of Germination of Pollen on Stigma

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Pollen is a yellow coloured dust-like substance produced by flowering plants. These pollen grains produce male gametes.

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Pollen grains are produced by anther. The stamen, i.e., anther and pollen grains, is the male reproductive part of the flower.

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Study of pollen grains is known as palynology.

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Ovary, style and stigma are the female reproductive parts. Pollen grains reach the stigma of the flower through the process of pollination.

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Transfer of pollen grains from the anther to stigma. Pollination is of two types.

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The transfer of pollen grains from the anther to the stigma of the same flower is known as self-pollination.

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Pollen grains of one flower transfer to the stigma of another flower is known as cross-pollination.

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Pollination occurs in different ways. These include air, water, insects, birds, animals and humans.

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After pollination, pollen grains reach the stigma. Stigma secretes some sticky nutrient fluid that contains sugar and other substances.

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These sugar liquids are produced by antipodal and synergid cells of the embryo sac.

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Pollen grains absorb these sugar liquids. Pollen grains germinate to form a pollen tube.

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Pollen grains absorb these sugar liquids. Pollen grains germinate to form a pollen tube. Pollen grains have two nuclei.

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The tip of the pollen tube enters the embryo sac. The end of the pollen tube ruptures and releases two nuclei into the embryo sac.

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