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This 1 page Reader was uploaded by Patrick Maloney on Friday January 30, 2015. The Reader belongs to ECOL182 at University of Arizona taught by Walsh, Perriere, Chesson in Spring2015. Since its upload, it has received 66 views. For similar materials see Introduction to Biology II in Science at University of Arizona.
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Date Created: 01/30/15
Mycorrizal fungi critical in soilplant interactions Saprophytes digest dead plant material critical agents in the land carbon cycle It s the only eukaryote that can digest wood Cause diseases in plants rusts smuts mildews blights as well as valley fever athlete39s foot vaginitis ringworm Single cells yeasts complex filaments mycelia Hyphae individual filamets Heterokaryon most hyphae are haploid in many species there can be two distinct haploid nuclei Septa no true cell walls within the hyphae which have septa holes hence the mycelia is somewhere between a multicellular and a giant single celled organism Mycelia Very high surface area to volume ratios making absorption extremely efficient but makes fungi prone to drying out Extracellular digestion synthesize and secrete enzymes outside their hyphae the resulting compounds are then absorbed by the hyphae Mating types a and alpha Plasmogamy occurs when the cytoplasms fuse if the nuclei remain independent the mycelium becomes heterokaryotic Karyogamy occurs when the nuclei fuse Zygosporangium hyphae of different mating types yoked together Basidia spores formed on little pedestals Asci spores formed in sacs Chytridiomycota motile cells produce spores and gametes with flagella Zygomycota has a zygosporangium most are saprophytes some are parasitic or predatory Basidiomycota basidia form at the ends of hyphae and produce spores above ground mushrooms Ascomycota produce saclike cells asci quotsaccharomyces cervisiaequot is used for brewing baking and wine making model organism for research Microsporidia single celled and parastic has a polar tube that allows them to enter the interior of the cell they parasitize Dramtically reduced genome and lack fuctioning mitochondria Lichens known as a chimera two things in one fungal outside layers and algal layer on the inside algae is cyanobacteria