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Kingdom Fungi






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Kingdom Fungi. Characteristics. Fungi are NOT plants Nonphotosynthetic Eukaryotes Nonmotile Most are saprobes (live on dead organisms). The Characteristics of Fungi. Absorptive heterotrophs (digest food first & then absorb it into their bodies
Kingdom Fungi

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Kingdom Fungi

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Characteristics

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Fungi are NOT plants

Nonphotosynthetic

Eukaryotes

Nonmotile

Most are saprobes (live on dead organisms)

The Characteristics of Fungi

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Absorptive heterotrophs (digest food first & then absorb it into their bodies

Release digestive enzymes to break down organic material or their host

Store food energy as glycogen

The Characteristics of Fungi

BREAD MOLD

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Important decomposers & recyclers of nutrients in the environment

Most are multicellular, except unicellular yeast

Lack true roots, stems or leaves

The Characteristics of Fungi

MULTICELLULAR MUSHROOM

UNICELLULAR YEAST

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Cell walls are made of chitin (complex polysaccharide)

Body is called the Thallus

Grow as microscopictubes or filaments called hyphae

The Characteristics of Fungi

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Some fungi are internal or external parasites

A few fungi act like predators & capture prey like roundworms

The Characteristics of Fungi

Predaceous Fungi feeding on a Nematode(roundworm)

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Some are edible, while others are poisonous

The Characteristics of Fungi

EDIBLE

POISONOUS

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Produce both sexual and asexual spores

Classified by their sexual reproductive structures

The Characteristics of Fungi

Spores come in various shapes

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Grow best in warm, moist environments

Mycology is the study of fungi

Mycologists study fungi

A fungicide is a chemical used to kill fungi

The Characteristics of Fungi

Fungicide kills leaf fungus

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Fungi include puffballs, yeasts, mushrooms, toadstools, rusts, smuts, ringworm, and molds

The antibiotic penicillin is made by the Penicilliummold

The Characteristics of Fungi

Penicillium mold

Puffball

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Vegetative Structures

NON-REPRODUCTIVE

Hyphae l.jpgSlide 13

Tubularshape

ONE continuous cell

Filled with cytoplasm & nuclei

Multinucleate

Hard cell wall of chitin also in insect exoskeletons

Hyphae

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Stolons – horizontal hyphae that connect groups of hyphae to each other

Rhizoids – rootlike parts of hyphae that anchor the fungus

Hyphae

STOLON

RHIZOIDS

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Cross-walls called SEPTA may form compartments

Septa have pores for movement of cytoplasm

Form network called mycelia that run through the thallus (body)

Hyphae

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Absorptive Heterotroph

  • Fungi get carbon from organic sources

  • Tips of Hyphae release enzymes

  • Enzymatic breakdown of substrate

  • Products diffuse back into hyphae

Nucleus “directs” the digestive process

Enzymatic breakdown

Enzymes

Digested material is then used by the hypha

Modifications of hyphae l.jpgSlide 17

  • Fungi may be classified based on cell division (with or without cytokinesis)

    • Aseptate or coenocytic (without septa)

    • Septate(with septa)

Modifications of hyphae

NO CROSS WALLS

CROSS WALLS

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Modifications of hyphae

HAUSTORIA – parasitic hyphae on plants & animals

Septate Hyphae

Coenocytic Hyphae

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Hyphae grow from their tips

Mycelium is an extensive, feeding web of hyphae

Mycelia are the ecologically active bodies of fungi

Hyphal growth

This wall is rigid

Only the tip wall is plastic and stretches

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REPRODUCTIVE STRUCTURES

ASEXUAL & SEXUAL SPORES

Reproduction l.jpgSlide 21

Most fungi reproduce Asexually and Sexually by spores

ASEXUAL reproduction is most common method & produces genetically identical organisms

Fungi reproduce SEXUALLY when conditions are poor & nutrients scarce

REPRODUCTION

Spores l.jpgSlide 22

Spores are an adaptation to life on land

Ensure that the species will disperse to new locations

Each spore contains a reproductive cell that forms a new organism

Nonmotile

Dispersed by wind

Spores

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Sexual Reproduction

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  • Used when environmental conditions are poor (lack of nutrients, space, moisture…)

  • No male or female fungi

  • Some fungi show dimorphism

    • May grow as MYCELIA or a YEAST –LIKE state (Filament at 25oC & Round at 37oC)

SEXUAL REPRODUCTION

Dimorphic Fungi

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Haploid 1n hyphae from 2 mating types (+ and -) FUSE (Fertilization)

Forms ahyphae with 2 nuclei that becomes a ZYGOTE

The zygote divides to make a SPORE

SEXUAL REPRODUCTION

-

+

SPORE FORMS

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ASexual Reproduction

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  • Fragmentation – part of the mycelium becomes separated & begins a life of its own

  • Budding – a small cell forms & gets pinched off as it grows to full size

    • Used by yeasts

  • Asexual spores – production of spores by a single mycelium

Three types of Asexual Reproduction

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Reproduce by spores

  • Spores may be Formed:

    • Directly on hyphae

    • Inside sporangia

    • On Fruiting bodies

Penicillium hyphae

Pilobolussporangia

Amanita fruiting body

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Fruiting Bodies are modified hyphae that make asexual spores

An upright stalk called the Sporangiosphore supports the spore case or Sporangium

ASEXUAL REPRODUCTION

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  • Types of Fruiting Bodies:

    • Basidia

    • Sporangia

    • Ascus

ASEXUAL REPRODUCTION

Sporangia

Basidia

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Fruiting Bodies

Both are composed of hyphae

mycelium

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Mycelia have a huge surface area

More surface area aids digestion & absorption of food

Hyphal growth from spore

Germinating spore

mycelium

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Evolution of Fungi

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  • Which of the following is most closely related to a mushroom (fungus)?

  • WHY?

    Recent DNA-based studies show that fungi are more similar to animals than to plants

Cladogram

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Evolution of the Fungi

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  • Fungi are classified by their REPRODUCTIVE STRUCTURES and SPORES

  • The reproductive structures are:

    • BASIDIA - BASIDIOMYCOTA

    • SPORANGIA - ZYGOSPORANGIA

    • ASCUS - ASCOMYCOTA

It’s All About the Spores!

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  • Spores are made of:

    • Dehydrated cytoplasm

    • Protective coat

    • Haploid cell

  • Wind, animals, water, & insects spread spores

  • Spores germinates when they land on a moist surface (new hyphae form)

It’s All About the Spores!

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asci

basidia

zygosporangia

Classification & Phylogeny

motile spores

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Major Groups of Fungi

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Major Groups of Fungi

  • Within the past few years, several groups have been re-classified into the protists

  • Two of these groups are the slime molds and water molds

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  • Saprobes

    • Decomposers

    • Molds, mushrooms, etc.

  • Parasites

    • Harm host

    • Rusts and smuts (attack plants)

  • Mutualists

    • Both benefit

    • Lichens

    • Mycorrhizas

Classification by Nutrition

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Major Groups of Fungi

  • Basidiomycota – Club Fungi

  • Zygomycota – Bread Molds

  • Chytridiomycota – Chytrids

  • AM Fungi - Mycorrhizas

  • Ascomycota – Sac Fungi

  • Lichens – Symbiosis (algae & Fungi)

Zygomycota l.jpgSlide 43

ZYGOmycota

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Zygomycota

Rhizopus on strawberries

  • Called the sporangiumfungi

  • Commonly called molds

  • Also includes blights

  • Hyphae have no cross walls (aseptate)

  • Grow rapidly

  • Includes bread moldRhizopus stolonifer

Tomato Blight

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Zygomycota

  • Asexual reproductive structure called sporangiumatop sporangiospores make spores

  • Rhizoids anchor the mold & release digestive enzymes & absorb food

  • Stolonsconnect the fruiting bodies

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Zygomycota

  • Sexual spores are produced by conjugation when (+) hyphae and (-) hyphae fuse

  • Sexual spores are called ZYGOSPORES

  • Zygospores can endure harsh environments until conditions improve

zygospore

Basidiomycota l.jpgSlide 47

Basidiomycota

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Basidiomycota

  • CalledClub fungi

  • Includes:

    • Mushrooms

    • Toadstools

    • Bracket & Shelf fungi

    • Puffballs

    • Stinkhorns

    • Rusts and smuts

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Some are used as food (mushrooms)

Others damage crops (rusts & smuts)

USES For Basidiomycota

Portobello Mushrooms

Soybean Rust

Corn Smut

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Seldom reproduce asexually

The visible mushroom is a fruiting body

Basidiocarp(fruiting body) is made of a stalk called the stipeand a flattened cap with gills called Basidia underneath

Basidiospores are found on basidia

Annulus is a skirt-like ring around some stipes

Vegetative structures found below ground

Characteristics of Club Fungi

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Hyphal fusion of haploid mycelia

mycelium and fruiting body are dikaryotic

Mushroom Life Cycle

haploid mycelium

N 2N N+N

Meiosis

Nuclear fusion in basidium

Fig 31.12

young basidia - the only diploid cells

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Ascomycota

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Characteristics

  • CalledSac fungi

  • IncludesCup fungi, morels, truffles, yeasts, and mildew

  • May be plant parasites (Dutch elm disease and Chestnut blight)

  • Reproduce sexually & asexually

  • Ascus - sac that makes ascospores in sexual reproduction

  • Specialized hyphae known as Ascocarps contain the asci

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Characteristics

  • Yeasts reproduce asexually by budding (buds break off to make more yeast cells)

  • Asexual spores called conidia form on the tips of special hyphae called conidiophores

CONIDIA

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Conidia Formation

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Yeasts Budding

Saccharomyces

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Uses of Ascomycetes

  • Trufflesandmorelsare good examples of edible ascomycetes

  • Penicillium mold makes the antibiotic penicillin.

  • Some ascomycetes also gives flavor to certain cheeses.

  • Saccharomyces cerevesiae (yeast) is used to make bread rise and to ferment beer & wine.

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CHYTRIDIOMYCOTA

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Chytridiomycota

  • Called chytrids

  • Produce motile spores

  • Mostly saprobes and parasites in aquatic habitats

  • Biodegrade and recycle nutrients

Chytrid that attacks Potatoes

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MYCORRHIZA

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  • Fungus associated with plant roots

  • Mutualism between:

    • Fungus (nutrient & water uptake for plant)

    • Plant (carbohydrate for fungus)

  • Several kinds:

    • Zygomycota – hyphae invade root cells

    • Ascomycota & Basidiomycota – hyphae invade root but don’t penetrate cells

  • Extremely important ecologically

Mycorrhizas

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Lichens

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Lichens

  • Mutualism between:

    • Fungus(structure)

    • Algae or cyanobacteria (provides food)

  • Form a thallus (body)

    • Foliose

    • Fruticose

    • Crustose

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Lichen structure

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Thalli act like sponges

Some species more sensitive than others to pollutants

Which species are present can indicate air quality

Most resistant species can also be analyzed for pollutants

Lichens as biomonitors


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