kingdom fungi the characteristics of fungi the characteristics of fungi the evolution of the fungi...
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Kingdom Fungi
• The characteristics of fungi
• The evolution of the fungi
• Fungal classification
• Fungal life stylesAll photographsin this presentation © Pearson Education or Fred M. Rhoades
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The Characteristics of Fungi
• Fungi are NOT plants
• Hyphae = tubular units of construction• Heterotrophic by absorption• Reproduce by spores• Ecologically pivotal roles
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Hyphae
• Tubular• Hard wall of chitin• Crosswalls may
form compartments (± cells)
• Multinucleate• Grow at tips
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Heterotrophic by Absorption• Fungi get carbon from organic sources• Hyphal tips release enzymes• Enzymatic breakdown of substrate• Products diffuse back into hyphae
Product diffuses backinto hypha and is used
Nucleus hangs backand “directs”
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Modifications of hyphae
Fig 30.2 (don’t worry about the terms)
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Hyphal growth• Hyphae grow from their tips• Mycelium = extensive, feeding web of hyphae
• Mycelia are the ecologically active bodies of fungi
This wall is rigid Only the tip wall is plastic and stretches
Video of time lapse growth in a Zygomycote, Phycomyces
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Reproduce by spores• Spores are reproductive cells
* Sexual* Asexual
• Formed:* Directly on hyphae* Inside sporangia* Fruiting bodies
Amanita fruiting body
Pilobolus sporangia
Penicillium hyphae
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Hyphal growth from spore
mycelium
germinatingspore
• Mycelia have a huge surface area
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Fig 31.1
mycelium
fruiting bodies
both are composed of hyphae
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Fungal Ecology• Saprobes
* Decomposers* Mostly of plants, some animals
• Parasites* Harm host* Mostly on plants, some animals
• Mutualists* Lichens* Mycorrhizas* Others
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Fig 28.8
Evolution of the fungi
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Classification & Phylogeny
motile spores
zygosporangia
ascibasidia
Fig 31.4
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Chytridiomycota – “chytrids”
• Simple fungi• Produce motile spores• Mostly saprobes and
parasites in aquatic habitats
• Could just as well be Protists
Fig 31.5 Chytridium growing on spores
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Zygomycota – “zygote fungi”
• Sex - zygosporangia• Asex - common• Hyphae have no cross
walls• Grow rapidly
• Mycorrhizas
Fig 31.6 Rhizopus on strawberries
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Fig 31.7 Life cycle of RhizopusYou are not responsible for this life cycleLife cycle is predominantly haploid
Asexual sporangium with spores inside
Sexual zygsporangium with one zygospore
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Ascomycota – “sac fungi”
• Sex. – asci• Asex. – common• Cup fungi, morels,
truffles• Important plant
parasites & saprobes• Yeast - Saccharomyces• Most lichens
A cluster of asci with spores inside
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Sac fungi diversity
• Note general comments about habitats and roles
• Enjoy looking at some amazing organisms
• This smaller-sized PPT file lacks diversity slides
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Basidiomycota – “club fungi”
• Sex – basidia• Asex – not so common• Long-lived dikaryotic
mycelia• Rusts & smuts – primitive
plant parasites• Mushrooms, polypores,
puffballs• Enzymes decompose wood• Mycorrhizas
SEM of basidia and spores
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Mushroom Life Cycle
Fig 31.12
Nuclear fusion in basidium
Meiosis
Hyphal fusion of haploid myceliahaploid
mycelium
young basidia - the only diploid cells
mycelium and fruiting body are dikaryotic
N 2N N+N
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Club fungi diversity
• Check out Taylor Lockwoods, “Treasures from the Kingdom Fungi”!
• This smaller-sized PPT file lacks diversity slides
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A rust growing on a currant leaf
0.5 cm
• Yeasts• Molds• Mycorrhizas• Lichens
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Yeasts
• Single celled fungi• Adapted to liquids
* Plant saps* Water films* Moist animal tissues
CandidaSaccharomyces
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Schizosaccharomyces octospora – fermenter of Palm Wine
10 μm
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Molds• Rapidly growth• Asexual spores• Many human importances
* Food spoilage* Food products* Antibiotics, etc.
Fig 31.21 Antibiotic activityNoble Rot - Botrytis
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Mycorrhizas• “Fungus roots”• Mutualism between:
* Fungus (nutrient & water uptake for plant)* Plant (carbohydrate for fungus)
• Several kinds* Zygomycota – hyphae invade root cells* Ascomycota & Basidiomycota – hyphae invade root
but don’t penetrate cells
• Extremely important ecological role of fungi!
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“Ecto”mycorrhizas
Russula mushroom mycorrhizas on Western Hemlock root
Fungal hyphae around root and between cells
Mycorrhiza cross sections
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Lichens• “Mutualism” between
* Fungus – structure* Alga or
cyanobacterium – provides food
• Form a thallus* Foliose* Fruticose* Crustose
Fig 31.16
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Lichen internal structureFig 31.17
Lobaria
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Lichens as biomonitors
• Thalli act like sponges• Some species more sensitive• Which species are present can indicate air quality• (Most resistant species can also be analyzed for
pollutants)• Northwest Air Net Project
* Species chart* Table of sensitivities
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Lichen diversity
• Check out my 3-D cryptogam site!
• More pictures of:* Lichens* Mushrooms* Bryophytes* Slime molds
• This smaller-sized PPT file lacks diversity slides