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Understanding the Evolution of Seedless Plants and Their Adaptations

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This article delves into the fascinating evolution of seedless plants, exploring their journey from nonvascular forms in the Ordovician period to advanced vascular species in the Devonian and beyond. It covers key adaptations to terrestrial life, including the development of apical meristems, multicellular embryos, and spore production. We examine the classification of nonvascular (Bryophyta, Hepatophyta, Anthocerophyta) and vascular seedless plants (Lycophyta, Psilophyta, Sphenophyta, Pterophyta), and their unique reproductive strategies, highlighting the intricate relationships between plant evolution and their environment.

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Understanding the Evolution of Seedless Plants and Their Adaptations

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  1. Seedless Plants

  2. Plant Evolution

  3. Plant Evolution • Nonvascular Seedless plants • (Ordovician - 475 mya) • Vascular Seedless plants • (Devonian - 400 mya) • Vascular Seed plants • (Carboniferous - 360 mya) • Flowering plants • (Cretaceous - 130 mya)

  4. Plant Evolution(Common with Algae) • Multicellular and Eukaryotic • Cell walls made of Cellulose • Chlorophyll a and b • Store excess sugar as starch

  5. Charophyceans • Homologous Cell Walls • Peroxisome enzyme (Photorespiration) • Homologous Chloroplasts • Sperm ultrastructure • Phragmoplasts (Mitosis & Cytokinesis) • Genetic Relationships

  6. Adaptations to Terrestrial Life • Apical Meristems • Multicellular Dependent Embryos • Alternation of Generation • Walled Spores produced in Sporangia • Other Adaptations • Cuticle, stomata, Xylem & Phloem, secondary compounds

  7. Apical Meristems

  8. Multicellular Dependent Embryos

  9. Alternation of Generation

  10. Walled Spores produced in Sporangia

  11. Other Adaptations

  12. Adaptations in Shallow Water Algae • Subjected to occasional drying • Protection of gametes and embryos in gametangia • Sporopollenin

  13. Nonvascular Seedless plants Bryophyta Mosses Hepatophyta Liverworts Anthocerophyta Hornworts Vascular Seedless plants Lycophyta Club mosses Psilophyta Whiskferns Spenophyta Horsetails Pterophyta Ferns Classification of Seedless Plants

  14. Nonvascular Seedless Plants • Plant is a thallus (no vascular tissue) • no true leaves, roots, stems • Embryophytes • gametangia • (antheridium and archegonium) • sporangium (produces spores)

  15. Hepatophyta • Liverworts • Two forms • leafy (80%) • thalloid (20%)

  16. Hepatophyta • Liverworts • Reproduction • asexual (gemmae cups) • sexual

  17. Anthocerophyta • Hornworts • Similar to liverworts except for sporophytes • Most closely related to higher plants

  18. BryophytaMosses

  19. BryophytaMosses

  20. Vascular Seedless Plants • Formation of vascular tissue • Xylem (water) • Phloem (food) • True leaves, roots, and stems • Lignin • Sporophyte generation dominate • Sperm with flagella

  21. Lycophyta • Lycophytes • true leaves • microphylls • true stems • true roots • sporophylls • leaves that produce spores

  22. Psilophyta • Whisk Ferns • no true leaves • no true roots

  23. Sphenophyta • Horsetails • true leaves • microphylls • true stems • silica • true roots

  24. Division: Pterophyta

  25. Division: Pterophyta

  26. Fern Life Cycle

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