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The Angiosperm Plant Body

The Angiosperm Plant Body

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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