kingdom fungi first fossil evidence about 600 my ago; may have been on land before plants usually...
TRANSCRIPT
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Kingdom Fungi
• first fossil evidence about 600 my ago; may have been on land before plants
• usually small• fungi are saprophytic or
parasitic• if saprophytic, they
secrete enzymes that break down organic material and absorb nutrients from that
• If parasitic, means lives off hosts
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Kingdom Fungi
• most fungi are multicellular and filamentous
• some are unicellular—yeast
• most are non-harmful, a few are deadly
• fungal cells use a glucose polymer, chitin, as their main cell wall component
• the body of a multicellular fungus is a mycelium, composed of filaments called hyphae
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Kingdom Fungi
• fungi are non-motile (usually)
• have no flagella or cilia in any part of their life cycle (usually)
• they have to grow towards a food source; sometimes up to a kilometer (6/10ths of a miles) per day growth
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What groups make up the Fungi?
• Slime molds (both cellular and acellular) are now split off from rest of fungi
• Bread molds
• Water molds
• Sac fungi
• True mushrooms
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From 2012
Sac fungi
Mushrooms
Water molds
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Sac fungi
Mushrooms
Water molds
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sexual reproduction involves:1. the meiosis of a
temporarily diploid cell to produce haploid spores
2. wind-dispersed to new areas
3. spores grow directly back into hyphae
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asexual reproduction occurs by budding in yeast, or by fragmentation of a mycelium
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1. Water molds • Rusts, shower
mildews, fish fungi, potato blight
• Responsible for 2 historic events: 1. Irish potato famine—1845-1851
2. French vineyard disaster—1870s
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• 2. Bread molds
• Produces spores from stalked structures
• Some use water pressure to blast their spores some 30 feet away at 25 miles per hour
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3. Sac fungi
• Morels, truffles, ergot, chestnut blight, Dutch elm disease, yeasts
• “sac” name comes from spore-holding cell, holds 8 spores
• Life cycle is haploid cells growing in filaments, then some cells fuse (n + n) but don’t merge nuclei until much later
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4. Club fungi
Mushrooms, shelf fungi, puffballs
“Club” is name for part of mycelium that produces spores
Clubs found on gills
Many are very toxic and fatal the first time you try one
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http://imgkid.com/fungi-mushroom-diagram.shtml
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5. Imperfect fungi
Fungi with no known sexual stages
A 'junkyard' group
Example: nematode-trappers
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Fungi can parasitize humans:
Yeast infections
Tinea pedis (athlete's foot) affects the feet
Tinea unguium affects the fingernails and toenails
Tinea corporis affects the arms, legs, and trunk
Tinea cruris (jock itch) affects the groin area
Tinea manuum affects the hands and palm area
Tinea capitis affects the scalp
Tinea barbae affects facial hair
Tinea faciei (face fungus) affects the face
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Fungus + Algae = Lichen
Some fungi can form a living association with algae = symbiosis
No official name for these, since they consists of two different organisms living together
3 types: crustose, foliose, and fruticose
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Economic aspects of fungi
• Allow many plant seeds to germinate• We use their enzymes in biotechnology• Sources of antibiotics• Fungi produce cheeses• Fungi produce alcohols
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Yeasts: the source of ethanol
• Alcohol=ethanol (not methanol; methanol is poisonous)
• 2 types: fermented & distilled• Alcohol derived from Arabic al kuhul because
they invented distillation process• Proof = double the % of ethanol:
– 100 proof = 50% ethanol– 190 proof = 95% ethanol
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Fermented vs. Distilled• Fermented: beers, wines• Distilled: uses fermented
solutions & steam to concentrate % ethanol
• Fermented uses fungus Saccharomyces to turn glucose into ethanol as a byproduct
• ~50% of sugars get made into ethanol
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Fermented: Beer• Beers start as fermented
grains• Usually barley, rye, or
wheat (sometimes corn)• Malting=sprouting grain
used• Hops (marijuana family)
used to de-bitter beer• Beers (by law) usually 3.5%-
8%
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Fermented: Wine
• Wines start as fruits (grapes usually), not seeds• Grape wine usually red or white; white wine has
skins removed; red keeps skins• Usually 4-8% ethanol
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Other fermented:• Sake—rice beer, not wine• Pulque—agave-based (yucca
relative)• Chicha—corn-based
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Distillation Process• Ethanol boils at 83C,
water at 100C• As ethanol
evaporates, leaves water behind
• Fumes are concentrated
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Distilled: Whiskeys• 3 types: scotch, bourbon,
rye• Scotch: malted barley• Bourbon: malted corn
(only American whiskey)• Rye: malted rye
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Distilled: Vodka• Potatoes used as starch source• Usually 100-200 proof (50-100%)• Can almost run car on high proof
vodka• Tasteless, odorless
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Distilled: Rum
• Uses sugar cane sap as sugar source
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Distilled: Gin
• Flavored with juniper cones (‘berries’)
• Gin & tonic favorite drink of British because in India, gin covered the bitter taste of quinine (anti-malarial drug)
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Distilled: Tequila
• Made from sap of yucca-relative
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Brandy/Liqueurs
•A fortified wine
•Wine+ethanol
•Usually based on non-grape wine; ex. Blackberry, elderberry
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1. slime molds • Two groups, cellular and
mostly acellular• Body is mass of nuclei
called plasmodium • Can dry up into form
called sclerotium, then rehydrate and be fine
• Can also form spore-producing stalks
• Spores released, then grow into amoeboid-type forms
• These forms release chemical attractant and form diploid plasmodium