bi 211 lab: fungi - linn–benton community collegecf.linnbenton.edu/mathsci/bio/bienekr/upload/bi...
TRANSCRIPT
11/6/2013
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Kingdom Fungi
Announcements
Friday lab: Fungi & Lichen
Bring a Lichen to ID!
Do prelab
Quiz #4 Friday
Study Prokaryotes & Protists
Mushroom Fest extra credit due Fri
Email me or bring to lab
Endosymbiosis article– 1 page
summary due Friday.
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Protist review:
1-minute paper topics A. Why is the Kingdom Protista not an
evolutionarily valid group?
B. Briefly describe the malaria life cycle.
C. What is a red tide? Why do they form and
why are they dangerous?
Lecture Outline 1. Major Fungal Characteristics
2. Fungi Diversity
1. Chytrids
2. Zycomycets
3. Glomeromycets
4. Basidiomycets
5. Ascomycets
3. Ecology
1. Decomposers
2. Mutualisms
1. Lichen
2. Mycorrhiza
3. Endophytes
3. Pathogens
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Stepping back to “the tree”
Fungi are more closely related to animals than plants…
In your groups - discuss:
1. Why they were originally
thought to be more closely
related to plants?
2. Why they are now
considered to be more
closely related to animals?
Major Fungal
Characteristics 1. Organism organization:
Unicellular or
Multicellular
2. Eukaryotic cells
3. Heterotrophs-- they obtain their nutrients from other organisms
4. Fungi secrete enzymes outside their bodies and absorb the digested nutrients
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Fungi have
filamentous bodies
• Fruiting body
• Mycelium
Made of
hyphae
Anatomy
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Figure 18.1 Masses of hyphae form
mycelia
The dense interwoven mat you see here growing through leaves
on a forest floor is a mycelium made up of microscopic hyphae
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Filamentous body
Fig. 22-1
mycelium hyphae
Filamentous Structural Organization
One cell
of one hypha
thread
of the
mycelium.
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Septum and pore between cells in a
hypha
DNA in Chromosomes
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Haploid nucleus
Haploid cells have one set of chromosomes
Diploid cells have two sets of chromosomes
Fungi
(1n)
Adult
human
(2n)
What causes a ‘fairy ring’?
Discuss with your table
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Major Fungal Characteristics
Cell wall composition Chitin (with some cellulose), a nitrogen-containing polysaccharide
Characteristics of the Kingdom Fungi
Reproduction spores
asexual
sexual
Sex: Fungi can be classified
as:
male, female
….. + many more sexes!
Called “mating types”
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Fungi Classification & Taxonomy
Groups are based
on cell nuclear
structure: number
of nuclei per cell
and
Reproductive
structures
Hyphae cell nuclear structure
Hyphae of most species
are divided into many
cells by partitions called
septa (singular, septum);
each cell possesses one
or more nuclei
Pores in the septa allow
cytoplasm to stream from
one cell to the next.
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Fungi Classification & Taxonomy
Groups are
based on cell
nuclear
structure:
and
reproductive
structures
Phylogeny of the Major Groups of Fungi
Septation
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Fungal Diversity
56,000 known species
+ a million unknown?
Chytridiomycota
Most chytrids are aquatic
They are distinguished from other fungi
by forming flagellated spores that
require water for dispersal
They reproduce both asexually and
sexually
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Zygotmycota (Zygomycetes)
1% of known species
Successful, rapid reproducers
Produce and disperse hundreds of spores
from hyphae tips
Bread molds
Zygomycosis- malnourished, diabetics,
burns, weakened immunity systems
Zygomycota Zygote Fungi
Aseptate: Multi-nucleated cells of
hyphae
Reproduces both sexually and
asexually through sporangia
Reproductive structure:
zygosporangia
Examples: Rhizopus stolonifer &
Pilobus crystallinus
Pilobolus crystallinus
Rhizopus
stolonifer
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Pilobus crystallinus
http://www.youtube.com/watch?v=TrKJ
AojmB1Y
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Glomeromycota
Live in intimate contact with the roots of plants
Their hyphae penetrate root cells and form
microscopic branching structures inside the cell
Mutualism: Internal mycorrhizae
Club fungi (Basidiomycota)
25,000 species
Reproductive structures protrude out
from mycelium
“mushrooms”
Caps with gills on
surface that have
spores
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Basidiomycota
Cells: Septate
Amanita muscaria
Basidiomycota
Reproductive structures:
Basidiocarp, basidium,
basidiospore
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Ascomycota: Sac fungi Most diverse group
30,000 species
Cells: Septate
Reproductive structures Ascocarp, ascospores develop in
ascus
Symbiotic associations: Endophytic mycorrhizae -
beneficial association with plants
With insects: leaf cutter ants, termites
Peziza sp.
Ascomycota Sexual reproductive structures:
Ascocarp, asci, ascospores
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Ascomycota
Asexual reproduction
Structure: Conidia
Example:
Penicillium
Diverse lifestyles
Fungi can be:
Decomposers e.g. bread mold
Parasites e.g. Athlete’s foot
Mutualistic symbionts
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Decomposers
Angel wings
Pleurocybella porrigens
Chicken of the woods
Mutualists:
A. Lichens
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Lichen A. Lichens are a
composite
organism
(fungus+algae or
cyanobacteria)
The fungal component is
usually in the Ascomycota
Lichen
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Lichen with
basidiomycet
fungi
Lichen with
Basidiomycota fungi
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Ecological Roles of Lichens
Pioneer species: Survive in hostile
habitats and colonize new habitats
Cyanobacteria-containing lichens can fix
nitrogen
Convert atmospheric nitrogen to a form
plants can use
Environmental indicators
Symbiosis of Fungi with Other Organisms
1. Mutualistic
B. Mycorrhizal fungi
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Mycorrhizal fungi
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Symbiosis of Fungi with Other
Organisms
1. Mutualism
C. Endophytic fungi Aphids
Clacvicepts
Symbiosis of fungi with other
organisms
2. Pathogenic
Examples:
Ergot
Salem witch trials?
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Symbiosis of fungi with other
organisms
2. Pathogenic
Plant diseases caused by
Rusts
Smuts
Examples:
Corn smut
Dutch elm disease
Chestnut blight
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World’s largest
organism?
Pathogenic Fungi
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Lobster mushrooms
Parasitize other
fungi!
Pathogenic fungi
Symbiosis of fungi with other
organisms
2. Pathogenic Example:
Chytridiomycosis infectious skin disease that
affects amphibians
worldwide
Caused by a Chytrid fungus
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Chytrid life cycle
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Chytrid infection
The pathogenic chytrid, Batrachochytrium dendrobatidis,
has infected this frog
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Symbiosis of fungi with other
organisms: Pathogenic
White nose syndrome:
Geomycets destructens
Bat populations in the
east are devistated!
Globalization—from
Europe
Cordyceps/ Phasyrum and
Insects
http://www.youtube.com/watch?v=RuopJ
YLBvrI&feature=related