Chapter 31 Flashcards by Beth Erb

General Characteristics of Fungi

a. mostly multicellular and terrestrial

b. absorptive heterotrophs (small organics and minerals0

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You find an aquatic type of fungi. Name two characteristics:

a. Ingoldian Hyphomycetes

b. Stream decomposers

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A fungi is what type of heterotroph (small organics and minerals)?

Fungi are generally absorptive heterotrophs

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General Characteristics: Fungi
Absorptive heterotrophs:
a. \_\_\_\_\_
b. parasites
c. mutualists

Saprobes (an organism that derives its nourishment from nonliving or decaying organic matter.

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List three roles of fungi:

sap robes
parasites
mutualists

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T/F Fungi can be sap robes, mutualists but NOT parasites

False. Fungi can be sap robes, parasites or mutualists

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What are the cell walls of fungi made of?

chitin

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a fibrous substance consisting of polysaccharides and forming the major constituent in the exoskeleton of arthropods and the cell walls of fungi.

Chitin

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T/F Fungi only reproduce asexually using spores

False. Fungi reproduce sexually and asexually by spores

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You find a plant that you think is a fungi. it reproduces asexually by spores and is an ingestive heterotroph. It is multicellular and a stream decomposer. Is this a fungi? Why or why not?

No, this is not a fungi. It is an ingestive heterotroph, while fungi are absorptive heterotrophs.

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List the two types of Hypha

septate (walls between)

coenocytic (no walls)

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The parts of a septate hypha:

a. nuclei
b. cell wall
c. pore
d. septum

The parts of a ceonocytic hypha

a. cell wall
b. nuclei

The parts of a septate hypha:

a. nuclei
b. cell wall
c. pore
d. septum

The parts of a ceonocytic hypha

a. cell wall
b. nuclei

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You find a hypha with a pore, septum, nuclei and cell wall. What type of hypha would this be classified as?

Septate hypha

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each of the branching filaments that make up the mycelium of a fungus.

hyphae

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the vegetative part of a fungus, consisting of a network of fine white filaments (hyphae).

mycelium

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The Mycelium

a. Extensive branching hypha growth produces a mycelium
b. Mycelia are either on soil surface or other objects or grow below the soil
c. A single mycelium can cover 100s of acres of area with thousands of miles of hyphae
d. Hyphal growth is key to increased absorption due to increased surface area

The Mycelium

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the vegetative part of a fungus, consisting of a network of fine white filaments (hyphae).

mycelium

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What composes a mycelium?

Extensive branching hypha growth

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T/F Mycelia can be on the soil surface or other objects but NOT below the soil

False. mycelia can be either on the soil surface or other objects or grow below the soil

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A single_______can cover 100s of acres of area with thousands of miles of hyphae

mycelium

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For fungi, its hyphal growth is the key to what?

Fungi: Increased absorption of nutrients, water due to increased surface area

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Fungi have an increased absorption of nutrients and water due to what?

hyphal growth

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Know the general Fungal Life cycle.

Attach picture

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Fungal: Asexual Reproduction

Spores (n) go through germination to produce the mycelium which creates spore-producing structures (n) which then produce spores (n).

Fungal: Asexual Reproduction

Spores (n) go through germination to produce the mycelium which creates spore-producing structures (n) which then produce spores (n).

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Fungi Sexual Reproduction Spores (n) go through germination to produce the mycelium (n) which goes through plasmogamy (fusion of cytoplasm) and then a eukaryotic stage (n+n - may persist and divide for years) and then karyogamy (fusion of nuclei). Then a diploid stage (2n) occurs (very brief) and then meiosis to spore-producing structures (n) which produce spores (n).

Spores (n) go through germination to produce the mycelium (n) which goes through plasmogamy (fusion of cytoplasm) and then a eukaryotic stage (n+n - may persist and divide for years) and then karyogamy (fusion of nuclei). Then a diploid stage (2n) occurs (very brief) and then meiosis to spore-producing structures (n) which produce spores (n).

Fungi Sexual Selection

Spores (n) go through germination to produce the mycelium which creates spore-producing structures (n) which then produce spores (n).

Fungi: Asexual Life Cycle

Fungal Phylogeny a. Chytrids b. Zygomycetes (pin or sugar molds) c. Glomeromycetes d. Ascomycetes e. Basidiomycetes

``` Chytrids Zygomycetes (pin or sugar molds) Glomeromycetes Ascomycetes Basidiomycetes ```

``` Fungal Phylogeny Chytrids Zygote fungi Arbuscular mycorrhizal fungi Sac fungi Club fungi ```

``` Chytrids Zygomycetes (pin or sugar molds) Glomeromycetes Ascomycetes Basidiomycetes ```

common in lakes and soil flagellated spores thought to be among earliest fungi

Chytrids

You find a fungi that has flagellated spores and is common lakes and soil. What fungi taxon may this fungi be in?

Chytrids

Club fungi

Basidiomycetes

Mostly terrestrial, on soil or detritus Mycorrhizae are mutualistic on plant roots Coenocytic hyphae, expect where reproductive cells are formed Zygosporangia are extremely resistant to environmental conditions

Zygomycota

You find a fungi that has coenocytic hyphae and is extremely resistant to environmental conditions. When it attaches to plant roots, it has a mutualist relationship with them. What is this fungi?

Zygomycota (Zygote fungi - bread mold)

T/F Mycorrhizae on Zygomycota are mutualists on plant roots.

True

You find a fungi that you think is zygomycota. It has coenocytic hyphae where the reproductive cells are formed and is extremely resistant to environmental conditions and is found on garden plants. Is this an example of zygomycota?

No, because zygomycota have coenocytic hyphae except where reproductive cells are formed.

The Life Cycle of Zygomycota

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In the Sexual Life Cycle of Zygomycota, Karyogamy is followed by what?

Meiosis

mycorrhizae - symbiosis (typically) with eighty-percent land plants Arbuscular mycorrhiza - Penetrates cortical cells of roots - Helps to supply water, minerals and nutrients to roots

Glomeromycetes

What is the function of arbuscular mycorrhiza?

Helps to supply water, minerals, and nutrients to roots

A type of mycorrhiza in which the fungus penetrates the cortical cells of the roots of a vascular plant.

arbuscular mycorrhiza

Environment: Marine, freshwater, terrestrial (65k species) Yeast, cup fungi, truffles, morels Saprobes, plant pathogens, mutualists (lichens or mycorrhizae) Dikaryotic hyphae form ascocarps Sexual spores borne in asci on ascocarps Asexual spores borne in "naked" groups on hyphae

Ascocmycota (sac fungi)

You find a fungi that has asexual spores that arise on "naked groups" on the hyphae. The fungi is served at Tra Vigne on steaming hot fries. a. What is the classification of this fungi? b. Where is it found (3)? c. What 3 roles does it play?

a. Ascomycota b. Is found in marine, freshwater and terrestrial environments. c. This fungi could be a sap robe, plant pathogen, or mutualist.

Many fungi undergo a reproductive phase in which more than one genetically distinct nuclei (from 2 separate mating types) is present within the same cytoplasm. In the Ascomycota and Basidiomycota, this phase is termed "_____", whereas in other fungal phyla the phase is "_____.

dikaryotic (Ascomycota, Basidiomycota) | heterokaryotic (other fungal phyla)

Sexual Life Cycle of Ascomycota Neurospora can reproduce sexually by producing specialized hyphae. Conidia of the opposite mating type fuse to these hyphae (+). PLASMOGAMY A dikaryotic ascus develops. KARYOGAMY Karyogamy occurs within the ascus producing a diploid nucleus. (zygote) MEIOSIS The diploid nucleus divides by meiosis, yielding four haploid nuclei. Each haploid nucleus divides once by mitosis, yielding eight nuclei. Cell walls develop around the nuclei, forming ascospores. The developing asci are contained in an ascocarp. The ascospores are discharged forcible from the asci through an opening in the ascocarp. Germinating ascospores give rise to new mycelia.

KnowSexual Life Cycle of Ascomycota Neurospora can reproduce sexually by producing specialized hyphae. Conidia of the opposite mating type fuse to these hyphae (+). PLASMOGAMY A dikaryotic ascus develops. KARYOGAMY Karyogamy occurs within the ascus producing a diploid nucleus. (zygote) MEIOSIS The diploid nucleus divides by meiosis, yielding four haploid nuclei. Each haploid nucleus divides once by mitosis, yielding eight nuclei. Cell walls develop around the nuclei, forming ascospores. The developing asci are contained in an ascocarp. The ascospores are discharged forcible from the asci through an opening in the ascocarp. Germinating ascospores give rise to new mycelia.

Sexual Life Cycle of Ascomycota "__ occurs within the ascus, producing a diploid nucleus" "the diploid nucleus divides by meiosis, yielding ___ haploid nuclei" "each haploid nucleus divides once by __, yielding eight mitosis. Cell walls develop around the nuclei forming ascospores" "The developing ascidians are contained in an ___. The ascospores are ___ forcibly from the ascidians through an opening in the ascocarp. Germinating ascspores give rise to mycelia."

karyogamy four mitosis asci discharged

Basidiomycota - Club Fungi

mostly terrestrial roles: saprobes or plant parasites mushrooms, shelf fungi, puffballs, rusts septate hyphae dikaryotic fruiting body is the prominent visible stage of the life cycle spores are borne in basidia on basidiocarp, often on gills beneath the cap

You find a puffball that has a visible dikaryotic fruiting body. What type of fungi may this be?

Basidiomycota

Key Concepts: 31. 1 Fungi are ___ that feed by absorption 31. 2 Fungi produce ___ through sexual or asexual life cycles 31. 3 the ancestor of fungi was an aquatic, single-celled flagellated _____ 31. 4 Fungi have radiated into a diverse set of lineages 31. 5Funki play key roles in nutrient cycling, ecological interactions, and human welfare

heterotrophs, spores, protist

T/F A fungi absorbs nutrients from the environment outside of its body

True

The most common fungal body structure are: a. multicellular filaments and single cells (yeasts) b. single-celled filaments and multicellular cells (yeast) c. multi-cellular yeasts and single celled organisms d. skinny, flabby and the "dad-bod" look

a. multicellular filaments and single cells

Fungi form a network of tiny filaments that are called...

hyphae

Tubular cell walls surrounding the plasma membrane and cytoplasm of fungi cells

Hyphae

A strong but flexible polysaccharide that strengthens the cell walls of fungi

Chitin

All fungi are a. symbiont b. heterotrophic c. flagellated d. decomposers

b. heterotrophic

Which of the following cells or structures are associated with asexual reproduction in fungi? a. ascospores b. basidiospores c. zygosporangia d. conidiophores

d. conidiophores (Ascomycota)

The closest relatives of fungi are thought to be a. animals b. vascular plants c. mosses d. slime molds

a. animals

Ascomycota Phylum of Fungi: T/F Their sexual spores (ascospores) are borne externally in sacs called asci. They have vast amounts of sexual spores called (conidia), also.

False. Ascomycota have sexual spores (ascospores) that are borne internally in sacs called asci. They have vast amounts of asexual spores called conidia.

The elaborate fruiting body of Basidiomycetes that contain many basidia that produce sexual spores

Basidiocarp

T/F Glomeromycota do not produce Arbuscular mycorrhizae with plants, but Zygomycotas do.

False. Glomeromycota do produce arbuscular mycorrhizae with plants. (more than 80% of all plant species have such mutualistic partnerships with glomeromycetes).

For Zygomycetes, this is the place where karyogamy and. meiosis occur.

Zygosporangium

For Zygomycetes, this is the place where karyogamy and meiosis occur.

Zygosporangium

Which of these is not like the other? ascospores basidiospores zygosporangia conidiophores

conidiophores (Ascomycota - asexual structure)

Sexual Reproduction: Basidiomycete | What part of the basidiomycete is dikaryotic?

Basidiocarp

1. Two haploid mycelia of different mating types undergo plasmogamy. 2. Dikaryotic mycelium forms, growing faster than, and ultimately crowding out, the haploid parental mycelia 3. Environment cues, like rain or temp. changes, ... 4. The basidiocarp gills are lined with terminal dikaryotic cells called basidia Karyogamy 5. Karyogamy in the basidia produces diploid nuclei, which then undergo meiosis. Meiosis Each diploid nucleus yields four haploid nuclei. Each basidium grows four appendages and one haploid nuclei enters each appendage and develops into a basidiospore (SEM). 7. When .... Know this slide.

Know this slide.

Unique lifestyles in fungi

molds yeasts lichens mycorrhizae

There are four unique lifestyles in fungi. Three of them include molds, mycorrhizae and lichens. Which one is missing?

Yeast

Molds: Rapid growing, asexually reproducing Saprobes Parasites - downy mildew: spinach, beans, peas and grapes - aquatic molds: cottony growths on dead fish Fungi imperfect - no known sexual stage in life cycle - Penicillium has had economic importance as antibiotic source and in cheese making

Molds are... Rapid growing, asexually reproducing Saprobes Parasites - downy mildew: spinach, beans, peas and grapes - aquatic molds: cottony growths on dead fish Fungi imperfect - no known sexual stage in life cycle - Penicillium has had economic importance as antibiotic source and in cheese making

Rapid growing, asexually reproducing Saprobes Parasites - downy mildew: spinach, beans, peas and grapes - aquatic molds: cottony growths on dead fish Fungi imperfect - no known sexual stage in life cycle - Penicillium has had economic importance as antibiotic source and in cheese making

Molds

Name the three categories of Molds

Saprobes, parasites and fungi imperfect

Why are fungi imperfecti called this?

Because Fungi imperfecti have no known sexual stage in life cycle

Molds can be parasites, or downy mildew: spinach, beans, peas and grapes. What other type of parasite is a mold?

aquatic molds: cottony growths on dead fish

You find a cottony growth on a dead fish. What type of mold is this an example of?

Parasitic aquatic mold

``` unicellular (sometimes forms mycelium) - perfect: produces asci - imperfect: no asci, Deutromycota economic uses - bread making - alcohol production (enzymes convert carbohydrates to alcohol) ```

T/F Yeasts are unicellular and always forms mycelium

False. Yeasts are unicellular and sometimes forms a mycelium

What will a perfect, unicellular yeast do that an imperfect unicellular yeast will not do?

A perfect unicellular yeast will produce asci

Yeast infections in humans are caused by this unicellular yeast

Candida

You find a fungi that is unicellular, produces no asci, and can be used in alcohol production. How would you classify this fungi?

An imperfect yeast (Deutoromycta)

A symbiotic relationship of fungus and algae or cyanobacteria and yeast

Lichens

Lichens are generally ____, but occasionally they are ____

ascomycetes, basidiomycetes

What type of relationship do fungus have with algae, and algae or cyanobacteria have with yeast?

"balance of power" symbiotic relationship

What type of relationship do fungus have with algae, and algae or cyanobacteria have with yeast?

"balance of power" symbiotic relationship

T/F Lichens are generally basidiomycetes and sometimes glomeromycetes

False. Lichens are generally ascomycetes and sometimes basidiomycetes

Licens are an important _____ species in primary succession: can break down rock into sand, dead lichens, soil

pioneer

T/F In terms of their reaction to environment, Lichens are similar to Zygomycetes

True (very hardy and can survive desiccation)

Fungi from all 3 main divisions that are mutualistic with vascular plants Hyphae penetrate roots and sometimes even cells Aid plant in mineral uptake, receive organic molecules in return Some plants cannot survive without mycorrhizae Mushrooms beneath trees are typically the fruiting bodies of mycorrhizae

Mycorrhizae (a fungus that grows in association with the roots of a plant in a symbiotic or mildly pathogenic relationship.)

a fungus that grows in association with the roots of a plant in a symbiotic or mildly pathogenic relationship.

Mycorrhizae

Mycorrhizae are fungi from all three main divisions: basidiomycota, ascomycota and zygomycota

True

T/F Mycorrhizae hyphae can penetrate the roots of a vascular plant but not the cells

False

Ectomycorrhizae

hyphae surround the cortical cells of roots

List three benefits of fungi

decomposition of detritus pathogens :( food for animals and humans (leavening agent for bread, cheese, alcohol, etc.)

The sexual spores of ascomycota

ascospores

What are the ascomycota sacs called?

asci

Asexual spores of ascomycetes

conidia

T/F yeasts, a type of fungi, are multicellular

False. Yeasts are single-celled fungi.

Fungi Origins: Fungi are most closely related to ______ nucleariids Animals are most closely related to fungi Multicellularity arise ___ in animals and fungi The oldest undisputed fossils of fungi are only about 460 million years old

unicellular, separately

What were among the earliest colonizers of land?

fungi

You find a terrestrial fungi that has mutualist mycorrhizae on plant roots. It has septate hyphae where its reproductive cells are formed. What is this fungi?

Zygote fungi

You find a fungi with mycorrhiza that penetrates the cortical cells of roots but not the cell membrane. Its mycorrhizae has a symbiotic relationship with land plants. What is this fungi classified as?

Glomeromycete

You find a freshwater fungi that acts as a plant pathogen. It has sexual and asexual spores, and it has a dikaryotic hyphae which forms fruiting bodies. What is it?

Ascomycete (sac fungi)

Chapter 31 Flashcards

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