Lecture 30 _March 23_ Colonization of Land post

Lecture 30 _March 23_ Colonization of Land post - Biology...

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1 Lecture 30: Wednesday March 23, 2011 Biology 171 Colonization of Land and Early Plant Evolution Announcements Exam Review Sunday March 27, 3-5pm 1800 Chemistry Discussion Next Week: Ant & Fungal Coevolution Text Reading Chapter 30 (546-561) First Colonizers of Land Origin of Green Plants Adaptations of Plants to Life on Land - Non-vascular plants cuticle & stomata - Vascular Plants vascular tissues - Seed Plants pollen & seeds Alternation of Generations Why We Care • Almost all terrestrial food chains are based on plant production • Without plants, there would be no reptiles, birds, or mammals • Plants also produce most of the oxygen that allows us to breathe and sequester carbon dioxide from the atmosphere • Plants are important sources of medicine Food : wheat, rice, corn, barley… Clean Air Clothing : linen, cotton, Building material : wood & rope Fuel : wood & coal Medicine : aspirin, morphine, codeine, quinine, cancer drugs Human Uses of Land Plants
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2 What are Land Plants? land plants share these characteristics: - are multicellular, photoautotrophic eukaryotes - cells have cell walls - reproduce asexually & sexually - unique life cycle: alternation of generations with gametophyte & sporophyte stages When Did Land Plants Evolve? About 475 MYA, during the Ordovician When Did Land Plants Evolve? The first angiosperms appeared about 130 MYA, in the Cretaceous Colonization of Land: Plants First & Fungi Soon After (475 to 460 Ma) ; Animals Colonized Later (Insects about 400Ma, tetrapods about 370 Ma) oldest fossil fungus 460 Ma According to the fossil record, fungi colonized land soon after plants and mutualistic associations between plant roots and fungi are ancient Permian, Triassic, Jurassic From Cretaceous onwards
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3 Terrestrial habitats had been largely devoid of visible life for over 3 billion years. Land plants
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Lecture 30 _March 23_ Colonization of Land post - Biology...

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