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Fungi - PowerPoint PPT Presentation


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Fungi. Eukaryotic heterotrophs that have cell walls Cell walls – made of chitin Food Intake Digest food outside body and absorb it Feed by absorbing nutrients from decaying matter Live as parasites absorbing nutrients from bodies of hosts. Structure and Function.

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fungi
Fungi
  • Eukaryotic heterotrophs that have cell walls
  • Cell walls – made of chitin

Food Intake

  • Digest food outside body and absorb it
  • Feed by absorbing nutrients from decaying matter
  • Live as parasites absorbing nutrients from bodies of hosts
structure and function
Structure and Function
  • Multicellular (besides yeast)
  • Composed of Hyphae- thin filaments
    • Lack cross walls- multinucleated
    • Cross walls- cells contain one or two nuclei
slide4

Mycelium- multicellular fungi are composed of many hyphae tangled together in a thick mass

  • Large surface area- more area to absorb food
  • Fruiting body- reproductive structure
hyphae 3 types
Hyphae- 3 types
  • Rhizoids- anchor fungus
  • Stolons- on surface give rise to mating types (+ -)
  • Sporangiophores- give rise to tips of sporangia which produce spores
fairy ring
Fairy Ring

http://www.dnatube.com/video/1438/Bread-Mold

reproduction
Reproduction
  • Asexually-
    • Hyphae break off and begin to grow on their own
    • Produce spores- scatter and grow on their own
    • Sporangia- structures producing spores
    • Sporangiophores- specialized hyphae containing sporangia
slide10

Sexually- two types + and – (no male/female)

  • Hyphae of opposite types meet, nuclei fuse together
  • Nuclei form diploid zygote
slide12

Spores spread-

    • Wind
    • Animals
  • http://www.dnatube.com/video/1437/Mushroom
fungus phylum
Fungus Phylum
  • Zygomycota- common molds
  • Ascomycota- sac fungi
  • Basidiomycota- club fungi
  • Deuteromycota- imperfect fungi
fungi heterotroph
Fungi= Heterotroph
  • Saprobes- obtain food from decaying matter
  • Parasites- obtain food from living directly on organisms
  • Symbionts- live mutually with other organisms
  • Carnivorous- Ex: mushroom that traps worms
fungi decomposers
Fungi= Decomposers
  • Break down wastes
  • Promote recycling nutrients in environment
fungi parasite
Fungi= Parasite
  • Cause serious plant and animal disease
  • Plants
    • Corn smut
    • Mildews
    • Wheat rust
    • 15% of crops lost to fungus in temperate regions
    • 50% or up in tropical regions
slide17

Human diseases

    • Athletes foot
    • Yeast infection
slide18

Animal

    • Cordyceps- infect insects
    • Chitrid- affects frogs
fungus symbiotic
Fungus=Symbiotic
  • Lichens- fungus/cyanobacteria or green algae
    • organism- provides energy
    • Fungus- provides water and minerals, protection
slide20

Mycorrhizae- fungus/plants

    • Plant roots
    • 80% of plant species form mycorrhizae
    • Fungus- absorbs water/nutrients/release enzymes that free nutrients in soil
    • Plants- provide energy