the amazing world of fungus and protists
DESCRIPTION
Chapter 17-18 NotesTRANSCRIPT
The Amazing World of Fungus and Protists
Designed by yours truly….so you better appreciate it!
What is a protist?
Eukaryotes that are not classified as animals, plants or fungi.
Protists are classified by the way they obtain nutrition
3 Types of Protists
Animal-like protists- Protozoa Plant-like protists- algae and kelp,
photosynthetic Fungus-like protists-decomposers, slime
molds
Protozoa or animal-like Protists
Zooflagellates
Move using flagella
Giardia and Trypanosoma
Causes stomach upsets, diarrhea, comes from contaminated water Causes African sleeping
sickness, spread by the tsetse fly
Giardia
Trypanosoma
Protozoa or animal-like Protists
Amoebas and Forams Move using pseudopodia or false feet
Protozoa or animal-like Protists
CiliatesUse cilia for movement and feeding
Paramecium live in freshwater environments.
Paramecium
Protozoa or animal-like Protists
Some protozoans can’t move at all on their own
They are called apicomplexans.
These include Plasmodium which causes malaria, it is transmitted by mosquitos.
Malaria stinks!
Fungus-like protists-slime molds
These are NASTY! Very much like real fungus because it makes fungus like hairs on it and makes sporangia and fruiting bodies.
Slime molds, water molds, and downy mildews
Irish potato famine was caused by a downy mildew.
Slime Molds
Fungus-like protists
They are like real fungus because they break down organic material and are important decomposers and recyclers in the ecosystem.
Thank you Mr. fungus-like protist!
Plant-like protists
Include algae Include euglenoids-single-celled
photosynthetic protists, they are green Dinoflagellates cause red tide, mostly
unicellular
Plankton-microscopic organisms
Phytoplankton- photosynthetic protists that often float along with the currents of the ocean, include dinoflagellates
Zooplankton- animal-like protists in the ocean Plankton makes the base of the food chain in
many ecosystems
Other plant like protists
Diatoms have a glass like shell surrounding them
Seaweeds aren’t actually plants but a form of algae which is a protist
There are 3 kinds of algae, green, brown and red, which are used for many purposes
Diatoms are Pretty!
Green Algae-most well known
Chlamydomonas can sense and swim towards light
Volvox is a colonial algae shaped like a ball
Ulva are multicellular and form long strings and look just like plants
Holy Green Algae, Batman!
Brown-nosers!
The Red coats are coming!
Plants, fungi and animals evolved from protists. Endosymbiotic theory suggests that
organelles such as mitochondria and chloroplasts were capture protists that formed a relationship with early animal cells
Mitochondria and chloroplasts have separate DNA with the rest of the cell
They have double membranes indicating they were “folded” in to the early cells
YAY, we love fungus!
Hyphae are tiny threads of cytoplasm surrounded by a plasma membrane and a cell wall.
Hyphae are wound together and make up most of the fungus and when they branch out and grow underground, they form an interwoven mat o stuff called a mycelium
There’s a fungus among us!
Fungus feed by decomposing other organisms and absorbing the nutrients.
Fungi reproduce using spores. There are 4 types of fungus classified by
reproductive structures and physical structures.
The Zygote Fungi (Zygomycota)
Some types of mold are actually zygote fungi.
Makes structures called sporangia which they reproduce asexually with during times of prosperity and abundant nutrition.
Make structures called zygosporangium to reproduce sexually when times are tough. This helps them tolerate harsh conditions.
The Zygote Fungi (Zygomycota)
Sporangia
Sac Fungi- Ascomycota
Include many that we can eat like morels and truffles.
They form reproductive structures called the fruiting body which is what we see and sometimes eat.
Forms an ascus which is the sac in which the cells fuse to create spores to reproduce.
Sac Fungi- Ascomycota
The Club Fungi- Basiomycota
Includes most of the fungi you are familiar with
Mushrooms yay!!!!!!!
Forms structures called basidium which is used for reproduction.
Makes fairy rings. Fairy rings are the outer edges of the fungus mycelium.
Some mushrooms grow rapidly and appear within a few hours.
The Club Fungi- Basiomycota
Yeasts
Makes great bread but stinks when you have athlete’s foot.
Reproduce asexually like bacteria through budding and simple cell division.
One of the few single-celled types of fungi
Imperfect fungi
Some fungi are confused and are types of yeast but reproduce using an ascus like a sac fungus or a basidium like a club fungus. Sometimes nothing is know about their reproduction so they are classified as imperfect.
Yeast cell
Who you callin’
imperfect?!!
Imperfect fungi (Chytridiomycota )
Other notes
Some fungi which look like molds are actually classified as other things because of their reproduction.
Pencillium is a bread “mold” but is classified as a sac fungus because is produces an ascus.
A mold is classified as anything which is a fungus that grows fast, so that could mean pretty much anything.
Fungi have a major impact on other life. Fungi are symbiotic in some cases. A lichen is a pairing between a fungus and an
algae. The fungus is a sac fungus because it does produce an ascus or fruiting body.
Mycorrhizae are found in 90% of all tree species. This fungus increases the surface area of the roots to improve nutrition absorption.
Some plants, (mostly endangered) can’t grow without their mycorrhizae partners.
Lichens= sac fungus + algae
Mycorrhizae
Disease Causing Fungi
Of the 100,000 known species of fungi, about 30% are parasites mostly on or in plants. Dutch Elm disease has eliminated most elm trees in North
America. It evolved in Europe and was accidently transported in logs to America. American elms did not grow up with the fungus
and had no resistance to it. About 50 species of fungus are known to be parasitic on
animals. Some are yeast infections of the lungs which can be fatal. Other fungal parasites produce a skin disease called ringworm
because it forms red rings on the skin. Another highly contagious condition is athlete’s foot.
Fungal Diseases
Fungal Diseases
Commercial Uses of Fungi
Truffles are a delicacy that are hunted by dogs and pigs that can smell them underground.
They cost hundreds of dollars per kilogram and are used in fancy restaurants.
A certain strain of Penicillium is inject into cheese which ripens and forms bleu cheese.
Commercial Uses of Fungi
The Role of Fungi in Chemical Cycling Fungi and bacteria are the principal
decomposers that supply ecosystems with the nutrients essential for plant growth.
Fungi destroy 10-50% of the world’s fruit harvest every year.
The air is completely loaded with fungal spores.
When something dies, it is completely invaded and decomposed.
Fungus as decomposers