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Lecture 11 - plant diversity I0 - Lecture 12 Outline Plant...

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Lecture 12 Outline – Plant Diversity I I. Plants evolved from green algae A. Shared characters with algae 1. Multicellular 2. Eukaryotic 3. Photosynthetic 4. Cell walls contain cellulose Land plants share a common association with green algae Plants are terrestrial II. Charophyceans are closest land plant relative A. Inhabit shallow, ephemeral waters; selects for desiccation resistance B. Shared characters with charophyceans 1. Rose shaped complexes for cellulose synthesis (instead of linear) 2. Peroxisome enzymes (for photorespiration) 3. Phragmoplast (specialized microtubules)-only in charophycean and land plants Charophyceans survived in water and without water, they became so good at surviving when water wasn’t around that they adapted 75 MYA Cambrian explosion-in Ordovician invasion of land plants III. Terrestrial plant evolution A. Land invasion during Ordovician (~480 MYA) B. Terrestrial adaptations 1. Cuticle - waterproof epidermal layer (to keep water in) 2. Sporopollenin - durable polymer that prevents pollen desiccation
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