BIOL 111 Lecture Notes - Lecture 6: Basidiomycota, Chytridiomycota, Chlorophyll
Document Summary
Heterotrophs (obtain nutrients from other organisms) life cycles with dikaryotic (n+n) stages. Secrete enzymes which digest food outside the body. Absorbed by specialized structures: hyphae (network of threads), which form a mass: mycelium (the complete feeding network of hyphae of a fungus) Septate: hyphae may have cross walls that separate nuclei and cytoplasm into cells. Absorb from nonliving sources (fallen trees and animal corpses. Both fungus and host organism benefit from the relationship (mycorrhizal association of a fungus with plant roots) Mainly asexual (when environmental conditions are stable) Glomeromycota- comprised of important mycorrhizal fungi that live in mutualistic relationship with plant roots. Beneficial in adapting to a changing environment. Only occurs when mycelia of different mating strains meet and fuse. Union of gamete cells in distinct phases. Plasmogamy: the union of the cytoplasm of the 2 gamete cells. 2 nuclei may remain dikaryon (unfused) for long periods of time.
