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Unformatted text preview: asmogamy produces a resistant structure called a zygosporangium in which karyogamy & meiosis occur Resistant to freeze and drying & are metabolically inactive not metabolizing at all When conditions improve release genetically diverse haploid spores undergo meiosis to produce haploid spores cytoplasm fuses Phylum Glomeromycota ~ 160 species Form a distinct type of mycorrhizae (arbuscular mycorrhizae) endo push up against plasma membrane Push into plant root cells, form arbuscules (tiny tree-like structures). Found in about 90% of plants both are benefiting Phylum Ascomycota: Sac fungi - produce sexual spores in saclike asci > 32,000 species of ascomycetes or sac fungi marine, freshwater & terrestrial Range in size from unicellular yeasts to elaborate cap fungi & morels Include some of most devastating plant pathogens Many are important saprobes Defining feature is production of sexual spores in saclike asci Sexual stages occur in macroscopic fruiting bodies = ascocarps forms sac like fruiting body Produce asexually by producing enormous # of spores at tips of specialized hyphae (conidiophores) spores called conidia Phylum Basidiomycota: Club fungi 30,000 species including mushrooms, shelf fungi, puffballs rusts and smuts Basidium (L., little pedestal ) transient diploid stage in organisms life cycle Important decomposers of wood & other plant material (best at decomposing lignin) Life cycle includes long-lived dikaryotic mycelium Periodically mycelium reproduces sexually by producing elaborate fruiting bodies called basidiocarps A mushroom is a basidiocarp Basidia of a basidiocarp are sources of sexual spores Cap supports & protects large surface area of basidia on gills Mycelium can erect fruiting structure in just a few hours Fairy ring may appear overnight Increases about 30 cm/y Molds, yeasts, lichens & mycorrhizae are specialized lifestyles that evolved independently in diverse fungal phyla Morphological & ecological adaptations - evolved independently among zygote, sac & club fungi Molds Rapidly growing, asexually reproducing fungi Go through series of different repro...
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This document was uploaded on 03/02/2014 for the course BIO 109 at University of Missouri-Kansas City .

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