BIOL10005 Lecture Notes - Lecture 20: Symbiogenesis, Apicoplast, Red Algae
3 Oct 2018
School
Department
Course
Professor
Document Summary
Genetics and evolution - lecture 20 - week 10. Dinoflagellates: photosynthetic protists, 2 agella, derived from a red algae (endosymbiosis, tertiary symbiotic chloroplast: has 6 cell membranes, toxic algal blooms: red tides, bioluminescence, zooxanthellae: symbionts in corals and some other animals (causes coral bleaching) First land plants: water balance, gas exchange (co2 from atmosphere), water transport (buoyancy), structural support and reproduction, very small, looked like moss or similar, don"t fossilise well, first evidence: spores, covered in a substance that preserves them well. Adaptation of first land plants: cuticle: waxy covering the covers the surface of all land plants. So water can be e ciently moved from one part of the plant to another. Functional cells are trachids and are dead: stems, roots, leaves (begins at ferns). Di erentiation of tissues into organs is an advanced feature: secondary growth and vascular cambium. Allowed plant to grow larger and add girth.
