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Evolution of Plant Diversity: A Journey into the World of Botanical Wonders

Join us for a captivating discussion on the evolution of plant diversity, from algae to tracheophytes, exploring key concepts of endosymbiosis, chloroplast evolution, and unique plant structures. Uncover the mysteries of Bryophytes, Lycophytes, and Equisetum as we delve into the fascinating world of plants! Discover the significance of genes in QTL analysis, the regulation of abscission, and the challenges facing conservation biology. Bring your books and curiosity to unravel the secrets of plant life with us today!

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Evolution of Plant Diversity: A Journey into the World of Botanical Wonders

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  1. Announcements Urban Forestry project continues!!! Discussion on reading.

  2. Reading Natural shattering of seed in rice. Genes of large effect vs. many genes of small effect QTL analysis – what is it? Crossing studies – Regulation of abscission very important to plants

  3. Conservation Biology What do you think are the most important questions? How can the many challenges we face be resolved?

  4. Plant diversity Will start following the book much more closely. Would be useful to bring your books to class. Chapter 7 for today's lecture

  5. Evolution of plant diversity Endosymbiosis has evolved several times, including several separate events creating 'chloroplasts' Figure 7.1 Figure 7.2

  6. Algae Red Algae (Rhodopytes) Brown Algae (Phaeophytes) Diatoms (Bacillariophytes) Dinoflagellates Chlorophytes • Chara

  7. Red Algae

  8. Red Algae Typically in deep water Often 'crustose' Quite poorly known with very complicated life cycles

  9. Brown Algae

  10. Brown Algae Kelp forests 'Plant-like' growth forms Middle depth and often have organs that allow them to float.

  11. Diatoms

  12. Diatoms Abundant and diverse in both marine and freshwater environments Must go through sexual reproduction to restore size because of morphology. Diatomaceous earth – an effective way to get rid of a flea infestation.

  13. Dinoflagellates

  14. Dinoflagellates Unique morphology with two flagellae located in grooves. Form important symbioses with reefs, sponges, and squids – zooxanthellae. Diatomaceous earth – an effective way to get rid of a flea infestation.

  15. Chara - “muskgrass” A likely ancestor of all land plants

  16. Algae as biofuels. Many of the major players in the energy industry are moving away from this idea though. Craig Venter has a team working on it.

  17. Evolution of plant diversity Figure 7.6 Invasion of land “Bryophytes”? Liverworts, Hornworts, and Mosses

  18. Liverworts

  19. Liverworts - Marchantia Thallus – flattened body

  20. Hornworts

  21. Hornworts

  22. Evolution of plant diversity Figure 7.8 Tracheophytes Lycophytes Monilophytes – Psilotum, Ophioglossus, Equisetum

  23. Algaophyton

  24. Lycophytes – Lepidodendron

  25. Lycophytes - Selaginella

  26. Lycophytes - Lycopodium

  27. Equisetum

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