Pollination and Fertilization in Flowering Plants - PowerPoint PPT Presentation

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Pollination and Fertilization in Flowering Plants

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  1. Pollination and Fertilization in Flowering Plants Plant Propagation

  2. Pollination • Begins when a grain of pollen lands on a receptive stigma. • It ends when a pollen tube punctures the embryo sac.

  3. Pollen Grain = Generative nucleus + Tube nucleus What kinds of things can move pollen from an anther to the receptive stigma of a flower? Stigma

  4. Generative nucleus Pollen grain “germinates”. Tube nucleus forms a pollen tube which grows down through the style. Ovule inside the flower’s ovary

  5. The generative nucleus divides to create 2 sperm. The tube nucleus continues to lengthen the pollen tube

  6. The tube nucleus disintegrates when it reaches the ovule. The 2 sperm continue down the pollen tube and eventually reach the ovule as well.

  7. Ovule Pollen tube 2 Sperm Polar nucleus(Central cell) Integuments Egg nucleus Embryo sac

  8. Fertilization • In Angiosperms 2 different things are fertilized: • Egg nucleus • Polar nucleus • Fertilization is the fusion or “joining” of one sperm with the egg nucleus and the other sperm with the polar nucleus.

  9. In Angiosperms there is a “double fertilization”. The egg nucleus is fertilized by one sperm and the polar nucleus is fertilized by the other sperm. Fertilized polar nucleus Fertilized egg nucleus

  10. In nature many pollen grains will land on a stigma and start germinating simultaneously. Each ovule requires one grain of pollen for fertilization.

  11. Post-Fertilization Structures

  12. Embryo Seed coat Endosperm Cotyledon MONOCOT SEED

  13. Endosperm Seed coat Embryo Cotyledons DICOT SEED

  14. The End