BIOL108 Lecture Notes - Lecture 26: Ordovician, Polysaccharide, Dikaryon

• School: University of Alberta
• Department: Biology (Biological Sciences)
• Course: BIOL108
• Professor: Trevor Pasanen

Document Summary

Earliest evidence of fungi on land is ordovician (460 mya) same as plants. Hypothesis; earliest plants were symbiotic with fungi, while fungi aided colonization of. Molecular data shows fungi closer to animals than plants together in clade. Zygomycetes resistant zygosporangium as sexual stage. Glomeromycetes arbuscular mycorrhizae formed with plants. Ascomycetes sexual spores (ascospores) born internally in sacs called asci: vast. Cells walls contain polysaccharide chitin also in some arthropods. Store glycogen also in protists slime molds and animals. Hypothesis: recent high temperatures in hibernacula allow winter survival of fungus. Reproduction by spore asexual (conidia) and sexual. Asexual most common, favourable or unchanging conditions. Molds asexual stage of fungi from all phyla. some may become sexual or no longer. Karyogamy meiosis in reproductive structures only mold. Phylum basidiomycota club fungi, puffballs, mushrooms, shelf fungi, some yeasts, many mycorrhizae. **plasmogamy between different mating types delay dikaryon (n+n) may be long lived. **dikaryotic mycelia fast growing and outcompete haploid hyphae.