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Introduction to the Fungi
Some things you should know……
Goals for today•What are fungi? • How do fungi interact with other organisms?•Why should you care about fungi?
Think for a minute, then write down your opinion of fungi on the slip of paper you were given when you came in
Discussion Question
• Which of the following is most closely related to a mushroom (fungus)?
Why do you think so?
Kingdom comparisonChallenge Plants Fungi Animals
Energy
Water/ avoid
Desiccation
Reproduction
Cells
What do fungi “eat?”
• Decomposers break down complex molecules into sugars or consume sugars found in environmentExamples:
• common bread mold (eats carbs in bread)• shelf fungi on logs (eats carbs in cell wall of
wood)• white button mushrooms in store (eats
sugars and cellulose in dung)
What do fungi “eat?”
• Symbiotic fungi receive their energy (carbohydrates) directly from a plant or algal partner
Examples:
• mycorrhizal fungi (live on plant roots)
• lichens (contain algae)
What else do fungi “eat?”
• Predatory fungi, catch and digest other organisms (like nematodes)
But still absorptive nutrition! Just have to catch it first…
Summary: What do fungi eat?
• Heterotrophs (cannot make their own food like plants)
• Extracellular, absorptive nutrition secrete enzymes outside of their bodies, “digest” the food outside of their cells and then absorb the molecules into their cells.
• Live in their substrate (food)
How is this similar to us? What consequences/ advantages does it have?
Lichens
Absorptive nutrition makes lichens good indicators of air quality
Small Group Discussion Question
The white mushrooms comprise how many fungal individuals?
• one• 42• 420
What is the same in these two
photos?
What does a fungus body look like?
Fungi are made of hyphae (cells joined in thread-like strands)
Mushrooms are for sexual reproduction (~flowers)
Mycelium = body of the fungus
Hyphae = the “bricks” from which the mushroom is built
Recap: Definition of fungus
• Single or multi-celled eukaryote with heterotrophic, absorptive nutrition, chitinous cell walls, and which stores energy as glycogen
• Live in food source or go dormant in low humidity
Discussion Question
How big are fungi?How big are fungi?
A. Microscopic (too small to see)
B. Small (can hold in your hand)
C. About as big as people
D. Larger than a house
Example of a “humungous fungus”
• Armillaria bulbosa – a mushroom producing wood decomposer
• Covers at least 38 acres in a forest in Michigan
• Estimated to weigh 100 tons (size of a blue whale)
• Estimated to be at least 1500 yrs old
Why should you care about fungi?
A few reasons:
• They make foods we like to eat• Mycorrhizae are responsible for plant life on land
and high productivity rates• They decompose wood and organic matter• Penicillin and other medicines• They’re just really cool!
Examples of foods made possible by fungi
Yeast• Beer and Wine • BreadMushrooms• White button,
crimini,portabella• Truffles, chanterellesMycoprotein(food additive like tofu)
Cheese •Rennin, •blue cheeseSoy sauceTempehCitric acid (soft drinks)
Why should you care about fungi?
A few reasons:• They make foods we like to eat
• Mycorrhizae (plant:fungal symbioses that forms on plant roots) are responsible for plant life on land and high productivity rates
• They decompose wood and organic matter• Penicillin and other medicines• They’re just really cool!
Mycorrhizae• “myco” = fungus and “rhiza” = root• Symbiotic association between
plant roots and fungi• Several different types of association
(defined by structure of fungus:plant interface)
Do pine seedlings grow better with a mycorrhizal (fungal) partner?
% s
urv
ival
seed
lin
g h
eig
ht
(cm
)
seed
ling
wei
gh
t (g
)
Advantages to fungi
• Plants are a dependable and abundant source of
carbohydrates
Advantages to plant• Fungi are better than plants at acquiring
mineral nutrition (P,K, N) from the soil.
• Fungi improve a plant’s access to water
Because fungi– can access greater soil volume– can break molecules down into useable
forms
Fungi can access more of the soil because
1. Hyphae are smaller than plant roots
Hyphae are 1/500th the diameter of a plant root hair
Root Hair
hyphae
and fungi expand the surface area available for nutrient uptake
Fungi are better at acquiring nutrients because
2. Fungi have digestive enzymes that plants do not (remember absorptive nutrition)
– Can turn inorganic phosphorus and nitrogen into forms usable by plants
Because fungi secrete their enzymes outside of their cells (into the soil) they can use “dangerous” enzymes which produce too many free radicals to use inside cells
Recap of mycorrhizal benefitsFungi increase the water and nutrients available to their plant partners leading to:•Greater plant productivity
(larger profits in the timber, fiber industries)
•Greater reproductive success for plants (higher yields for agriculture)
•Greater ecosystem stability
Left: No mycorrhizal fungiRight: With mycorrhizal fungi
What would happen if a mycorrhizal fungus grew from one plant to another forming mycorrhizae with
both?
Hyphae are long “tubes” fungi are good at acquiring
and moving compounds
around.
Simard et al. (Nature 1997) experimental setup
These connections can form forest-wide networks!
Implication of fungal networks
• If mycorrhizae can move significant amounts of carbon (sugar) between different plant species, this could reduce competition and contribute to the stability and diversity of ecosystems.
Inadvertent “Parenting” in fungi• Mycorrhizal connections also may move carbon from
dominant trees to shaded seedlings (based on the same source sink relationship)
Are mycorrhizal interactions between
plants and fungi
rare
or
common?
Almost ALL plant species depend on mycorrhizae to some extent
2 of 6 Types of mycorrhizae
Plant partners
Vesicular-arbuscular (VAM)
~150 species of fungi
Nearly all terrestrial plants (200,000 species including grasses, crops, flowering plants, and flowering trees not listed below)
Ectomycorrhizae
~5,000-10,000 species of fungi
Conifer trees, oaks, birches, beeches, Eucalyptus)
(~2000 species of trees)
Why should you care about fungi?
A few reasons:• They make foods we like to eat• Mycorrhizae are responsible for plant life on land
and high productivity rates
• They decompose wood and organic matter
• Penicillin and other medicines• They’re just really cool!
What would happen if wood was not decomposed?
Fungi are important decomposers!
Fungi are the only organisms that can completely decompose lignin (what makes wood hard)
Lignin must be broken down before any other decomposition can occur (no fungi = no decomposition by anyone).
Fungi also decompose cellulose to glucose and play a major role in the global carbon cycle.
Why should you care about fungi?
A few reasons:
• They make foods we like to eat
• Mycorrhizae are responsible for plant life on land and high productivity rates
• They decompose wood and organic matter
• Penicillin and other medicines• They’re just really cool!
Penicillium
WWI, bacterial infections killed more soldiers than bullets.
1928 Dr. Andrew Fleming working at St. Mary’s Hospital in London noticed that mold growing on staph bacterial culture plates had killed the pathogen
zone of dead bacteria
Penicillin kills bacteria by interfering with their ability to synthesize cell wall.
Why do fungi make antibiotics?
Fungi produce antibiotics for the same reason we
need them:
to fight off bacterial infections
Why should you care about fungi?
A few reasons:
• They make foods we like to eat
• Mycorrhizae are responsible for plant life on land and high productivity rates
• They decompose wood and organic matter
• Penicillin and other antibiotics
• They’re just really cool!
• This power point will be posted on my website for your
studying convenience.
• Please write down on your scrap paper your “new” opinion of fungi
• Please turn in scrap paper answers as you exit.