Fungi
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Transcript of Fungi
FungiBy……...Sara Lee, Sruthi Merneedi,
Nikitha Duggirala…………..
Target 1 Kingdom Fungi•Fungi are heterotrophs; they cannot make their own food.•Fungi absorb nutrients from the environment outside of its body by secreting powerful hydrolytic enzymes into the environment to break down complex molecules so that they can be absorbed•Most fungi are structured with multicellular filaments and/or single cells (such as yeast)•Most fungi reproduce by producing large numbers of spores, either asexually or sexually
Key: Compare and Contrast
Fungi Plant•Fungi are heterotrophs
•Fungi cell walls are made of chitin
•Fungi can be coenocytic
•Plants are autotrophs
•Plants are made of cellulose
•Plants cannot be coenocytic
*eukaryotic*originated from protists*alternationof generations
Target 2Alternation of Generations
bcs.whfreeman.com
Hyphae are haploid. When two hyphae fuse in plasmogamy,
the resultimg mycelium is said to be heterokaryon, meaning there are two coexisting nuclei present.
In Karygomy, the two coexisting nuclei form to create a diploid zygote.
After meiosis, the haploid conditions are restored with the formation of haploid spores.
Target 3 Importance of Fungi ecologically,
economically, and medicinally
Ecologically Fungi As Decomposers
› Fungi Keep ecosystem stocked with inorganic material for plant growth
› Without fungi carbon nitrogen and other elements would be tied up in organic matter
› metabolize dead organisms and other waste products, making their molecules available to other creatures.
Mutualism› Endophytes-live inside leaves or plants which create toxins
that deter herbivores or by increasing host plan tolerance of heat drought, or heavy metals.
› Symbiosis-Some fungi share digestive services with animals which help break down plant material in the stomach.
› Lichens-is a mass of hyphae that hold individual photosynthetic cells
Economically Pathogens
› Chestnut blight, pine pinch canker, rye disease
› Fungal infections is called mycosis Ringworm disease Yeast infections Molds
Food› Creation of cheeses, colas, yeast, alcohol,
bread, mushrooms, truffles
Medicinally Fungi used to stop internal bleeding
after childbirth Antibiotics
› Penicillium› Cyclosporine- suppress immune system
after organ transplants
Target 4Zygomycota, Ascomycota, and
Basidiomycota
Zygomycota 1000 species Fast-growing molds on food Hyphae of zygomycetes spreads and absorbs
nutrients out over the food surface In asexual phase, bulbous black sporangium
develop at tips of the upright hyphae and are dispersed through the air
When environmental conditions deteriorate, zygomycetes may reproduce sexually› * Plasmogamy produces a zygosporangium, in which
karyogamy and subsequently meiosis can occur
Life Cycle of the Zygomycete
Figure 31.13 Campbell
Ascomycota A.k.a. Sac Fungi Ascomycotes produce sexual spores called ascospores in sac
like structure called an ascus (asci plural)+When ascomycotes reproduce sexually, dikaryotic cells
are formed, and cells at the tip of dikaryotic hyphae develop into many asci.
+Within each ascus, karygomy combines the two parental genomes and through meiosis, four different nuclei are formed. Mitosis following this results in eight ascospores.* an extended dikaryotic stage provide increased opportunities for genetic recombination
When Ascomycotes reproduce asexually, they produce an enormous amount of asexual spores called conidiospores in clusters at the tips of specialized hyphae called conidia.
Ascomycotes can be multicellular (ex. Morels and truffles) or unicellular (ex. Yeast)
Life Cycle of an Ascomycete
Figure 31.17 Campbell
Basidiomycota A.k.a Club Fungi Important decomposers of wood and
other plant material. During sexual reproduction of a
basidiomycete, two mycelium combine through plasmogamy to form a dikaryotic mycelium. In response to environmental stimuli, the basidiocarp forms (mushroom) The gills of the basidiocarp houses basidia, dikaryotic cells, which form basidiospores through meiosis.
Life Cycle of a Basidiomycete
Figure 31.19 Campbell