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Pteridophytes

Pteridophytes. Vascular non seed plants. Remember that all plants share certain features in their life cycles: Multicellular haploid gametophyte stage, which produces haploid gametes (egg and sperm). Egg and sperm fuse to form diploid zygote .

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Pteridophytes

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  1. Pteridophytes

  2. Vascular non seed plants

  3. Remember that all plants share certain features in their life cycles: • Multicellularhaploid gametophyte stage, which produces haploid gametes (egg and sperm). • Egg and sperm fuse to form diploid zygote. • Multicellulardiploid sporophyte stage, which produces haploid spores by meiosis. • Haploid spores grow into haploid gametophytes.

  4. Moss vs. Ferns • The biggest difference between fern life cycles and moss life cycles is that in ferns, the sporophyte is much bigger and longer-lived than the gametophyte. Fern gametophytes are typically only a few millimeters across.

  5. Life Cycle • http://www.sciencelearn.org.nz/Contexts/Ferns/Sci-Media/Animations-and-Interactives/Fern-life-cycle • http://www.deanza.edu/faculty/mccauley/6a-labs-plants-02.htm

  6. Homosporus Plant

  7. Homosporous Plant

  8. Heterosporous Plant • In ferns only the aquatic (water ferns) are heterosporous • Very important in evolution of seeds

  9. Heterosporous Plant

  10. A sporophyte produces two types of sporangia: micro- and megasporangia. • Microspores grow into microgametophytes that possess antheridia. • Megaspores grow into megagametophyteswith archegonia.

  11. Sporangia • Fern sporangia: produces spores • Spore mother cell undergoes meiosis (2n →n) • Fern sporophytes (like all sporophytes) are diploid. Haploid spores are produced inside the sporangia via meiosis. The spores are eventually released, and they can grow into new haploid gametophytes.

  12. Spores • Haploid (n) • Sporangia and spores with sporopollenin-enriched walls are key terrestrial adaptations of land plants • Spores are the main means of dispersal for all seedless plants

  13. Assignment • 6th edition: • Read 590- 594 • Summarize each section (4 sections) • Pg. 596 Take the self quiz for 1- 15

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