Lecture 31 _March 25_ Fungi post

Lecture 31 _March 25_ Fungi post - 3/23/11 1 Lecture 31:...

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Unformatted text preview: 3/23/11 1 Lecture 31: Friday March 25, 2011 Biology 171 Fungal Diversity and Evolution Announcements Exam Review: Sunday March 27, 3-5pm 1800 Chemistry Discussion Next Week: Ant-Fungal Coevolution Text Reading Chapter 31 (579-591) The Origin of Fungi Fungal Phylogeny Fungal Structure and Reproduction Ecological Roles of Fungi master decomposers vital mutualists dangerous diseases Fungi: Who Cares? • Fungi provide essential ecosystem services as decomposers, contributing in vital ways to carbon and nutrient cycling • Fungi also provide us with food (mushrooms, truffles) and with some medicines • We use fungi to make wine and cheese • Unfortunately, some fungi are also pathogenic, acting as sources of disease for humans, their crops, their livestock, and wildlife 3/23/11 2 What are Fungi? fungi share these characteristics: - all are chemoorganoheterotrophic eukaryotes - they absorb nutrients from other organisms - most are multicellular, one lineage is strictly unicellular - cells have cell walls made of chitin - complex life cycles; reproduce asexually and/or sexually When Did Fungi Evolve? 3/23/11 2 What are Fungi? fungi share these characteristics: - all are chemoorganoheterotrophic eukaryotes - they absorb nutrients from other organisms - most are multicellular, one lineage is strictly unicellular - cells have cell walls made of chitin - complex life cycles; reproduce asexually and/or sexually When Did Fungi Evolve? 3/23/11 3 oldest fossil fungus 460 Ma Origin of the Fungi • Fungi colonized land about 460 MYA, shortly after the appearance of the first land plants (475 MYA) • There were no animals on land to eat either plants or fungi until about 400 MYA (first insects) • Some fungi developed mutualisms with plant roots very early in the colonization of land and likely played a significant role in plant diversification A Phylogeny of the Fungi (Work In Progress) do not memorize this tree Fungal Structure • Fungi grow as either single cells or as mycelia – some species can do both • Mycelia provide very large surface area to volume ratios which allow fungi to absorb nutrients from the environment around them . But they are also prone to desiccation, and fungi are most abundant in damp environments 3/23/11...
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This note was uploaded on 04/24/2011 for the course BIOLOGY 171 taught by Professor Hunter during the Winter '09 term at University of Michigan.

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Lecture 31 _March 25_ Fungi post - 3/23/11 1 Lecture 31:...

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