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Bio 101 Day 13 - Ascomycete Summary Asciform at the top of...

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Ascomycete Summary Asciform at the top of each thallus Bottom of each thallus develops into an ascocarp Haploid Thallus (n) (+) and (-) Form asci during karyosis (n) plus (n) Zygote (2n) ↓meiosis 4 nuclei (n) ↓mitosis 8 nuclei (n) Become 8 ascospores in each asci Spores release haploid thallus (+) and (-) Asexual Sexual Conidia (at tips) Ascocarp Asci Life Cycle of Basidiomycete -Fusion of 2 hypha of different mating types during plasmogamy
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-Dikrayotic secondary mycellum forms; basidiocarp (fruiting body) develops and basidia form along gills -Karyogamy occurs producing diploid zygote nucleus -Meiosis produces 4 haploid nuclei which become basiospores -When basidiospores germinate—form haploid primary mycella of different mating types
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Basidiomycete Summary Haploid Thallus (n) (+) and (-) Dikyaosis Stage (n+n) Basidiocarp Structure forms (secondary structure) Basidia develop on gills (n+n) Zygote (2n) 4 Haploid Nuclei (n) Basidiospores (n) Form Haploid Thalli ↓ (Sexual Meiosis) TO BEGINNING OF CYCLE Basidiomycete Fruiting Bodies Causes diseases like dry rot and wheat rust Basidia line gills of Jack O’ Lantern Stink horn—smell attracts flies; helps dispense basidiospores in basidium Bracket fungus—grow on live and dead trees; shell-like bodies
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Basidium with Basidiospores -4 per basidium -Basidiomycetes include mushrooms, puffballs, bracket fungi, rusts, smuts Decomposers -Most fungi are decomposers -break down organic compounds; dead organisms etc into simpler nutrients (water, CO2) that can be recycled -Important for animals that don’t break down cellulose and lignin -Chytrids in cow’s stomachs -Symbiosis as fungi live in nutrient-rich environment Symbionts -Mycorrhizae: mutualistic between fungi and plant root -Lichens: symbiotic combination of fungus and photoautotroph (alga or cyanobacterium) -Photoautotroph provides fungus with organic compounds through photosynthesis, as well as water, minerals. Fungus provides protection Lichens Lichen: soredia are asexual reproductive structures consisting of clusters of algai or cyanobacterial cells enclosed by fungal hyphae Useful Lichens?
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