fungi - mt. sac faculty...
TRANSCRIPT
Fungi
General Characteristics• Primarily
terrestrial• Filamentous
– __________• Coenocytic
(aseptate)• septate
– mycelium– Haustoria –
specialized parasitic hyphae
Fungal Hyphae
General Characteristics(animal-like)
• Heterotrophic– absorption
(saprobes)– parasitic– mutualistic
• Cell Wall:______• Store sugar as
glycogen
Fungal Reproduction• Asexual
–haploid spores (conidia/sporangia)• Sexual
–hyphae (haploid)–Syngamy (diploid) – (like us)
• ____________ (dikaryon) (Heterokaryon)
• karyogamy (diploid)
Plasmogamy
Fugal Reproduction
Fungal Classification
Division: Chytridiomycota
• Have _______ (rare in fungi)• Coenocytic hyphae or
unicellular• Cell wall: chitin• Saprobes or parasites• May be most primitive fungi
Division: Zygomycota
Division: Zygomycota
• Coenocytic Fungi• Mostly terrestrial
(live on decaying material)
• Example: Rhizopus(Black bread mold)
• Uses: birth control pills, meat tenderizers, margarine coloring
(enzymes)
Fig. 31-13-4
Rhizopusgrowingon bread
SEXUALREPRODUCTION
Youngzygosporangium(heterokaryotic)
Gametangia withhaploid nucleiMating
type (–)
Matingtype (+)
Diploid (2n)
Haploid (n)Heterokaryotic (n + n)
PLASMOGAMY
Key
Diploidnuclei
Zygosporangium
100 µm
KARYOGAMY
MEIOSIS
Sporangium
Spores
Dispersal andgermination
ASEXUALREPRODUCTION
Dispersal andgermination
Sporangia
Mycelium50 µm
Essay! – probably at least one fungi one plant life cycle!
Division: Zygomycota
• Microsporidia–Parasitic
• Loss of organelles–Cause disease in
people with immune deficiency
–Used as pest control
Division: Glomeromycota
• Arbuscular mycorrhizae– Coenocytic Fungi– ________ - associated
with plant roots– increases surface area
for the absorption of water and nutrients
Division: Ascomycota
Divison: ________• Septate fungi (sac
fungi)• Saprobes,
mutualistic• Examples: Dutch
Elm Disease, yeasts, truffles, some molds
• Uses: Penicillium, pathogens(penicillin, tumor suppression) food(cheese and soy sauce)
Ascomycota
Fig. 31-17-4
KeyHaploid (n)
Diploid (2n)Dikaryotic (n + n)
Conidiophore
Mycelium
ASEXUALREPRODUCTION
Germination
Hypha PLASMOGAMY
Haploid spores (conidia)
Conidia;mating type (–)
Matingtype (+)
SEXUALREPRODUCTION
Dikaryotichyphae
Ascus(dikaryotic)
Mycelia
KARYOGAMY
Diploid nucleus(zygote)
Germination
Asci
Dispersal
Dispersal
AscocarpEightascospores
Fourhaploidnuclei MEIOSIS
Division: Basidiomycota
Division: Basidiomycota
• Septate Fungi (Club fungi)
• Saprobes, parasites, mutualistic
• Examples: mushrooms, toadstools, puffballs, shelf fungi
• Uses: Food
Division: Basidiomycota• Fairy Rings
Basidium
Fig. 31-19-4
SEXUALREPRODUCTION
Diploid (2n)
Haploid (n)Dikaryotic (n+n)
Key
PLASMOGAMY
Matingtype (+)
Haploid myceliaDikaryotic mycelium
Matingtype (–)
Basidia(n+n)
Gills linedwith basidia
Basidiocarp(n+n)
KARYOGAMY
Diploidnuclei
MEIOSIS
Basidium containingfour haploid nuclei
Dispersal andgermination
Basidiospores(n)
Basidium withfour basidiospores
Basidiospore1 µm
Haploid mycelia
Division: Deuteromycota• _________ fungi (no sexual cycle), septate hyphae• Examples: Penicillium?, Aspergillus, predatory fungi• Stachybotrys chartarum
Imperfect
Some taxonomist say Penicillium is an Ascomycota and deutromycota does not exist
__• Mutualistic -
association with a green algae or cyanobacteria and an ascomycota or basidiomycota
• Pioneer organisms
Lichen_____
Ecological Impacts• Decomposers• Pathogens (30% of
species…most plant pathogens).
• 10-50% world’s fruit lost due to Fungi
• Ergots on rye (lysergic acid > LSD)
• Food Production –recycling, alcohol, cheese, truffles
• Ergots – another compound used to reduce blood pressure/maternal bleeding after childbirth
• Worldwide 1/3 of worlds amph suffering serious decline
• 60% human diseases originate from animals3/7/17 24
Domain: Archaea
• Group: Methanogens– methane releasing
• Group: Halophiles– lives in high salt areas
• Group: Thermophiles– lives in extreme
temperatures
Viruses
b
Virus Structure
Virus Structure• Capsid – Protein
coat covering virus; present in all viruses. Capsids are made from protein subunits called capsomeres.
• __________ –Layer of fat surrounding capsid; present in some viruses but not all.
Viral Replication• Only reproduce
when they enter a host cell
• They lack ribosomes and enzymes necessary for protein synthesis and simple metabolism
Viral Genome Structure
• dsDNA• ssDNA• dsRNA • ssRNA
– Serve as mRNA– Serve as template
for mRNA– Serve as template
for DNA (retro)
Bullet shaped envelope
HIV (a retrovirus)• Viruses that
causes AIDS• Peters Duesberg
______• ss RNA that can
serve as mRNA• Can cause paralysis
in motor neurons• Transmitted through
fecal contaminated food/water
• Worse in intermediately clean cities
• Salk vaccine, 1954
Hepatitis• Inflammation of the
liver• At least 5 different
types of the virus• Hep A – ss RNA, no
envelope; fecal-oral• Hep C – ss RNA
with envelope; sexually transmitted/ blood
__________• Bullet Shaped
Envelope (ss RNA)
• Long incubation period
• Almost always fatal if unvaccinated.
• Zoonosis• Host Range
Flu• Influenza, commonly
known as the flu• Symptoms include
fever, sore throat, myalgia, coughing, weakness
• Many Epidemic/• PandemicEpisodes (1918-1919)
20-100 million died; Spanish Flu
3/7/17 36
• Infectious Protein Particles
• Examples:• Mad Cow
Disease• Creutzfeldt-
Jakob Disease• Kuru (Fore tribe
of Papua New Guinea)
Plant Diversity I
Highlights of Plant Evolution
Gymnosperms
Alternation of GenerationBoth a __________haploid and __________diploid stages in the life cycles.
Multicellular
Multicellular
Classification of Seedless Plants (Kingdom: Plantae)• Nonvascular
Seedless plants– _____________
• Mosses– Hepatophyta
• Liverworts– Anthocerophyta
• Hornworts
• Vascular Seedless plants– Lycophyta
• Club mosses– Psilophyta
• Whiskferns– Spenophyta
• Horsetails– _____________
• FernsKingdom Plantae – currently defined as plants with embryos)
Bryophyta
Pterophyta
We will treat all of these as “divisions”!
Bryophytes - Nonvascular Seedless Plants
• Plant is a thallus (no vascular tissue)–no true leaves, roots, stems
• __________/_________:–Gametophyte
• (antheridium and archegonium)–sporangium (produces spores)
Sporophyte
Hepatophyta• Liverworts
– Two forms• __________ (80%)• __________ (20%)Thalloid
Hepatophyta
• Liverworts– Reproduction
• Asexual
(_______________)
• sexual
Anthocerophyta• Hornworts
– Similar to liverworts except for sporophytes
– Most closely related to higher plants
____________
Sporophyte
BryophytaMosses
Moss gametophytes grow more vertically than horizontally
Bryophyta
Essay!
Pteridophytes - Vascular Seedless Plants
• Formation of vascular tissue–__________ (water)–__________ (food)–True leaves, roots, and stems
• Lignin (chemical in cell wall)• Sporophyte generation
dominate• Sperm with flagella
Phloem
Lycophyta
• Lycophytes– true leaves
• Microphylls – small, usually spine shaped leaves with a single vein.
– true stems– true roots– ____________
• leaves that produce spores
Sporophylls
Psilophyta
• Whisk Ferns– True stems– no true leaves– no true roots
Sphenophyta
• Horsetails– true leaves
• microphylls– true stems
• silica– true roots
Division: Pterophyta
Fern Life Cycle
Essay!