week 7

week 7 - Week 7 notes 9.30.11 Phylums listed list from most...

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Week 7 notes 9.30.11 Phylums listed – list from most diverse (largest amount of species) to the least diverse (smallest amount of species) Classification of Fungi o Phylum: Chytrids Ancient group – diverged earliest from the other fungi Aquatic – the only fungi with flagellated spores (zoospores) Sexual reproduction – flagellated spores These spores leave the parent with the ability to swim Saprobic – majority Parasitic – some o Phylum: Zygomycetes = Zygote Fungi Sexual reproduction – via zygosporangia ( resistant heterokaryons ) that produce genetically variable spores Black Bread Mold Life Cycle Sexual or asexual Sexual: o Unstable environment o Opposite mating types o Plasmogamy takes one nuclei form each parent and put them into ONE cell – creating a heterokaryotic (n+n) zygosporangium The cell will stay in this stage until the environment permits for the next stage of Karyogamy o 2 nuclei fuse (heterokayotic) together during Karyogamy Asexual: o Asexual reproduction – via sporangia that produce spores No genetic variation o Lots of mitosis occurs o All these haploid spores are identical to each other Mostly saprobic decayers of organic matter **** ****** o Phylum: Ascomycetes = Sac Fungi Sexual reproduction – via spores produced in asci (singular ascus) (sac like cases) Environment changes Hyphae of opposite mating types fuse – plasmogamy ***fill in steps Why do we find 8 spores in the final ascus sac? o 4 spores result from meiosis of a diploid cell o Each (of the 4) spores undergoes mitosis which results in 8 spores Asexual reproduction – via naked spores called conidia
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Halpoid spores that are identical to the mycelium Many saprobic species (i.e. scarlet cups) Astrocarp is the fruiting body for ascomycetes o Underneath the fruiting bodies are the mycelium Many parasites, especially of plants, but also of animals (i.e. Candida yeasts) Many symbionts with plants (i.e. truffles) Pigs are attracted to them because of the sex hormone in it Morels – delicacy or deadly Sources of many interesting chemicals i.e. penicillium – the source of penicillin Source of interesting chemicals The yeasts used to brew beer and bake breads and pizza crusts Mushrooms come from a different phylum o Phylum: Basidiomycetes = Club Fungi Include: Common mushrooms, puffballs, stink horns, shelf fungi, plant- parasitic smuts & rusts
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This note was uploaded on 01/19/2012 for the course BIO 1002 taught by Professor Hrinchevich during the Fall '10 term at LSU.

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week 7 - Week 7 notes 9.30.11 Phylums listed list from most...

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