Lec16_Fungi

Lec16_Fungi - Fungi are ! Unikont eukaryotes in the...

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Kathie Hodge Assoc Prof of Mycology [email protected] Fungi are ! Unikont eukaryotes in the supergroup Opisthokonta ! close relatives of yours ! often overlooked
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Characters of fungi ! filamentous ( hyphae ) tubular cells with cell walls of chitin ! reproduce via spores (sexual or asexual) Classification is based mainly on sexual spore producing structures ! Nutrition is heterotrophic and absorptive enzymes are excreted; the products of external digestion are absorbed ! Asexual cycle: Mitosis Spores are genetically identical ! Sexual cycle: Mating, then meiosis Spores are recombinant Different-looking fruiting bodies Fungi are Modular ! We are unitary organisms ! Fungi are modular Composed of repeating units Hard to define an individual Fungi can be big ! Even though most fungi are small, they can extend over large areas ! One fungus in Oregon (a “humungous fungus”) covers over 2200 acres of forest (3.4 sq. miles). This single colony is probably about 2400 years old .
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!"#$% '())(*+, %-. -#/#*+0#$ 1#*+#$ ($ 2.3445 3 -0*.5 /#$-200/6 7 fungal colonies grow radially because hyphae grow outward at the tips Origins ! Earliest fossil fungi date from the Ordovician (about 450 mya) ! Molecular clock data suggest an earlier origin (over 500 mya) ! Fungi may have facilitated early evolution and colonization of land by plants
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fossil fungi are scarce o fungi are ephemeral and don’t preserve well o they’re small o fruiting structures needed for classification /04) 82.$.29.) :;/53 (* <34%(= >/?.2 Fungal phyla "#$ 23##' Fungal phyla
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phylum Ascomycota ! the largest phylum (65,000 to 100,000 known species) ! truffles, morels, cup fungi, flask fungi, most yeasts and molds, most lichens ! Synapomorphy: the ascus cell in which meiosis occurs spores are formed internally inside asci, then forcibly discharged through an apical opening by a turgor cannon method ! three major lineages (subphyla)
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This note was uploaded on 12/20/2011 for the course BIOG 1440 taught by Professor Owens during the Spring '10 term at Cornell.

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Lec16_Fungi - Fungi are ! Unikont eukaryotes in the...

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