Chapter12part1 - Fungi Chapter 12 Most fungi are...

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1 Chapter 12 Eukaryotic Microorganisms Fungi Most fungi are beneficial; a few cause disease Chemoheterotrophs Decomposers in food chains Yeasts Unicellular Facultative anaerobes New cells produced by budding (asymmetric) or fission (symmetric) Saccharomyces species used in baking bread, brewing beer, etc. Molds Multicellular Aerobic Filamentous hyphae that mass together in a mycelium (colony) Vegetative hyphae absorb nutrients Reproductive, or aerial, hyphae form spores Fig. 12.2 Hyphal Structure Septate hyphae are divided into cells Coenocytic hyphae have continuous cytoplasm with many nuclei
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2 Dimorphic Fungi Some fungi can grow in either yeast or mold form, depending on environment Many of the pathogenic species are dimorphic Fungal Reproduction Fragments of hyphae can grow into new mycelia Or, spores can form Fungi have asexual and sexual spores (NOT like endospores: they are reproductive, and not especially resistant) Asexual Spores Conidiospores Not enclosed in a sac; several types Sporangiospores Form in a sac Conidiospores Sporangiospores Sexual Spore Formation Two haploid cells from different individuals fuse Spore structure forms Meiosis produces haploid spores Fungi are classified into phyla by type of sexual spores
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3 Fungal Phyla Zygomycota: molds, with coenocytic hyphae Ascomycota: Yeasts, and molds with septate hyphae Basidiomycota: Mushrooms “Deuteromycota”: turn out to be Ascomycota that have lost the ability to make sexual spores
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This note was uploaded on 04/18/2011 for the course MICR 130 taught by Professor Umemoto during the Fall '09 term at University of Hawaii, Manoa.

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Chapter12part1 - Fungi Chapter 12 Most fungi are...

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