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The Angiosperm Plant Body

The Angiosperm Plant Body. Structure and development Formation of embryo Mature embryo and seed Embryo to adult. The structure of the Flower. Fertilization detailed. In most angiosperms, the ovule consists of three layers of tissue:

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The Angiosperm Plant Body

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  1. The Angiosperm Plant Body • Structure and development • Formation of embryo • Mature embryo and seed • Embryo to adult

  2. The structure of the Flower

  3. Fertilization detailed

  4. In most angiosperms, the ovule consists of three layers of tissue: • Integuments - two outer layers of diploid (2N) tissue that will develop into the seed coat. • Nucellus - the wall of megasporangium, also diploid (2N). • Embryo sac - also call the megagametophyte of angiosperms, consists of only 7 cells. Contains 8 haploid nuclei in all.

  5. “Polarity” -Apical- basal pattern - Radial pattern

  6. Embryo development • Orderly cell division • Differentiation leads into two distinct parts • Embryo proper • The suspensor Before this stage is reached the developing embryo is referred to as the proembryo Becomes food nourishing component

  7. Monocot or Dicot? • Solanum caroliense

  8. Monocot or Dicot?

  9. Monocot or Dicot?

  10. Monocot or Dicot?

  11. Monocot or Dicot?

  12. Monocot or Dicot?

  13. Development of the embryo of a monocot (arrowhead)

  14. Stage of embryo development preceding cotyledon development • Globular stage- embryo proper (proembryo) is spherical • Heart stage (dicots only)- seed leaf (cotyledon) development • Torpedo stage- apical basal pattern just prior to germination

  15. Stages of embryo development • Stages of embryo development • Globar stage • Heart stage (dicot only) • Torpedo stage

  16. Pre Globular stage- proembryo

  17. Future Epidermis Embryo proper will become - meristemic tissue Future Ground meristem (ground) and Procambium (vascular)

  18. Forms the seed coat

  19. Twin embryo development- embryo proper limits the dev of suspensors

  20. (Precursor to vascular)

  21. (nucellar tissue) (Embryonic root)

  22. Lets look at Seed of some common dicots and monocots • Garden bean • Castor bean • Onion • Maize

  23. Grass embryo Mature grain or kernel of Wheat Monocot or dicot?

  24. Grass embryo -First bud of radicle Protective layer of radicle and plumule

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