1 / 11

Tracheophyte Evolution

Tracheophyte Evolution. Origin. Big split between Lycophyte lineage and Euphyllophytes Euphyllophytes have megaphylls, pseudomonopodial growth. Next Big Split. Monilophytes (ferns and fern allies, including horsetails) and Lignophytes

tuyet
Télécharger la présentation

Tracheophyte Evolution

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. Tracheophyte Evolution

  2. Origin • Big split between Lycophyte lineage and Euphyllophytes • Euphyllophytes have megaphylls, pseudomonopodial growth

  3. Next Big Split • Monilophytes (ferns and fern allies, including horsetails) and Lignophytes • Monilophytes: Multiflagellate sperm; reproduction by spores; many functional megaspores; stellar anatomy; chloroplast inversion.

  4. Lignophytes • Progymnosperms, Seed Ferns, Gymnosperms, and Flowering plants • Secondary xylem and phloem, cambial ring; heterospory.

  5. Seed plants • 1 functional megaspore; integument around megasporangium; seeds; pollen grains. • Radiation (= who knows order) into Genophytes, Conifers, Ginkgo, cycads and ANGIOSPERMS

  6. Angiosperms • Seeds in carpels; stigmatic surface; megagametophyte of 8 nuclei; double fertilization • Closest ancestor – shifting ideas

  7. Basal Angiosperm Evolution • Vessels after Amborella • Diploid endosperm • Carpels sealed by secretion

  8. And then …. • Postgenital fusion of carpel epidermes • Carpel primordium is U-shaped • Radiation – Magnoliids, ?? Monocots, Eudicots

  9. Monocots • Scattered vascular bundles; no vascular cambium; leaf blade from base of primordium; one cotyledon • About half the monocots are orchids (19,500) or grasses (10,000)

  10. Poales

  11. Monocots

More Related