PBIO 117 Lecture Notes - Rhizoctonia Solani, Basidiomycota, Parasitism
27 Dec 2013
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Sexless (usually: smuts, rust fungi, mushroom (class: basidiomycete) Soil inhabiting, causes a range of diseases. Mycelia & sclerocia (masses of fungal mycelium) Brown patch/large patch on grass: no asexual spores, persist as mycelium or sclerocia in thatch and soil, sexual spores are rare. Hyphae explore surface of plant and mass up when a wound is encountered: management. Smuts: 1200 + species that cause disease on cereals, attacks grain kernels and replace w/ dusty black spore masses. Plasmogamy occurs attached to the basidium: dikaryotic before leaving the basidium. Can overwinter as teliospored on the surface of a healthy seed for 10 yrs. Disease progress- dikaryotic hyphae penetrate seedlings: pathogen & seed race, if the pathogen wins, hyphae replalce the seed and form teliaspores. Fungicides: fungicide resistance has yet to happen so there is little investment in resistant cultivars, corn smut. Fusion (plasmogamy) of haploid hyphae occurs w/n plant. Fungus goes down silks & into plant, occurs before pollination.
