1 / 34

Chapter 30: Plant Diversity II: The Evolution of Seed Plants

Chapter 30: Plant Diversity II: The Evolution of Seed Plants. Free-Living Gametophytes. Reduced Gametophytes. Some Seed-Bearing-Plant Anatomy. Megasporangium gives rise (meiotically) to megaspores Integument envelopes, protecting the megasporangium

rod
Download Presentation

Chapter 30: Plant Diversity II: The Evolution of Seed Plants

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Chapter 30:Plant Diversity II:The Evolution ofSeed Plants

  2. Free-Living Gametophytes

  3. Reduced Gametophytes

  4. Some Seed-Bearing-Plant Anatomy

  5. Megasporangium gives rise (meiotically) to megaspores • Integument envelopes, protecting the megasporangium • An ovule consists of integument surrounding a megasporangium which in turn surrounds a megaspore • The female gametophyte develops mitotically from the megaspore • The female gametophyte gives rise mitotically to the female gamete, the egg • Once fertilized the egg develops into an embryonic sporophyte • The sporophyte embryo surrounded by the parental megagametophyte which, in turn, is surrounded by grandparental sporophyte tissue is a seed Ovules

  6. Seeds (are complicated) Gametophyte (haploid parent) Sporophyte (next generation) Sporophyte (grandparent)

  7. Gymnosperms Gymnosperms have seeds and vasculature but not flowers nor fruit

  8. Gymnosperms “Gymnosperms are plants that have “naked” seeds that are not enclosed in ovaries. Their seeds are exposed on modified leaves that usually form cones.” p. 593, Campbell & Reece (2005)

  9. Gymnosperm

  10. Pollen & Heterospory This is pollen!

  11. Pollen freed plants from flagellated sperm so no more need for water for fertilization to take place Pollen & Pollen Tube

  12. Grains of Pollen Seed-bearing plants disseminate their sperm/male gametophyte as pollen Pine pollen

  13. Overall this life cycle takes about three years (not including growth to sexual maturity of the resulting tree) Gymnosperm Life Cycle

  14. Angiosperms Angiosperms are vascular plants that produce seeds via flowers and distribute those seeds via fruit

  15. Male part A Flower Female part

  16. Flower Cross Section

  17. Pigmented Sepals

  18. Flying Penises! One of the great advantages of flowering is the potential for pollination by animals

  19. Origin of Flower Structure

  20. Primitive Flowers

  21. Fruit “A fruit typically consists of a mature ovary, although it can include other flower parts as well…”

  22. “…As seeds develop from ovules after fertilization, the wall of the ovary thickens. A pea pod is an example of a fruit, with seeds (mature ovules, the peas)…” Various Fruits

  23. Even More Fruits “…encased in the ripened ovary (the pod). Fruit protects dormant seeds and aid in their dispersal.” p. 598, Campbell & Reece (2005)

  24. Angiosperm Life Cycle

  25. Embryo Sac: 7-Cell Gametophyte Synergids …antipodal cells… Egg Double fertilization is of these two cells Formation of embryo sac: the angiosperm female gametophyte Polar Nuclei

  26. Double Fertilization

  27. Monocots vs. Eudicots

  28. Monocots vs. Eudicots

  29. Monocots vs. Eudicots

  30. Overview: Bryophytes (moss)

  31. Overview: Pterophytes (ferns)

  32. Overview: Coniferophytes (pines)

  33. Overview: Anthophytes (flowering)

  34. The End

More Related