Bis2CF10.Lecture23

Bis2CF10.Lecture23 - Extra office hours: Friday 1:30-2:30...

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Unformatted text preview: Extra office hours: Friday 1:30-2:30 BLC Review session: Sunday, 3:00-5:00, 123 Science Lecture Hall “Faced with information overload, we have no alternative but pattern-recognition.” Marshall McLuhan (via Tom Goliber) Phylogeny = the pattern Evolution = the process that made the pattern Lecture 22 FUNGI: ASCOMYCETES Last: aquatic fungi, early terrestrial lines Dikarya: basic life cycle Ascomycetes: “hemiascomycetes,” including yeasts Euascomycetes Next: lichens, basidiomycetes EUKARYOTES Chromalveolates Plantae Excavates Rhizaria Opisthokonts UNIKONTS Amoebozoans coenocytic hypha zoospore Absorptive heterotrophy Chitin walls Sporangium with rhizoids and chitinous wall Haploid life cycle zoospore Allomyces: alternation of generations zygosporangium alternation of generations? paraphyletic! paraphyletic! Loss of motile cells Terrestrial form mycorrhizae Dikarya Septate hyphae Dikaryotic stage Sporangium with rhizoids and chitinous wall Haploid life cycle zoospore Allomyces: alternation of generations zygosporangium alternation of generations? paraphyletic! paraphyletic! form mycorrhizae Dikarya Septate hyphae Dikaryotic stage GENERALIZED LIFE CYCLE OF DIKARYA fusion of cytoplasms Dikaryotic hyphae fusion of nuclei DELAY OF KARYOGAMY GENERALIZED LIFE CYCLE OF DIKARYA Asexual “loops” fusion of cytoplasms Dikaryotic hyphae fusion of nuclei DELAY OF KARYOGAMY Absorptive heterotrophy Chitin walls Sporangium with rhizoids and chitinous wall Haploid life cycle zoospore Allomyces: alternation of generations zygosporangium alternation of generations? paraphyletic! paraphyletic! Loss of motile cells Terrestrial form mycorrhizae Dikarya Septate hyphae Dikaryotic stage “Hemiascomycetes” Saccharomycetes Taphrinomycetes Taphrina Euascomycetes Saccharomyces yeasts secondarily unicellular Dimorphic: hyphal and yeast-like stages ascocarp ASCOMYCOTA ascus; conidia/budding? Euascomycetes Conidia: asexual sporeproducing structures Ascomycota, Taphrinomycetes Taphrina: leaf curl disease of peaches asci 2n Taphrina n+n 1n asci epidermis Taphrina Schizosaccharomyces Pneumocystis Neolecta Saccharomycetes Saccharomyces baker’s/brewer’s yeast S. cerevisiae Yeast cells budding Fermentation: C6H12O6 → 2C2H5OH + 2CO2 Saccharomycetes Saccharomyces baker’s/brewer’s yeast n+n 2n 1n Fermentation: C6H12O6 → 2C2H5OH + 2CO2 ascus perithecium Diversity of ASCOCARPS apothecium cleistothecium Truffle hunting in France CONIDIA Penicillium spp. ASCOMYCETES Cordyceps: parasitic on insects Cordyceps sinensis: “vegetable caterpillar” Arthrobotrys: ascomycete predator of nematodes ...
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