GMED1000 Lecture Notes - Lecture 8: Saprotrophic Nutrition, Food Spoilage, Sporangium

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Reproduce by budding (asexual) - new daughter cell grows from mother cell - blastospores. Fungi and their spores are ubiquitous (found everywhere in the environment) Four morphological groups based on thallus, aka the vegetative body. Molds: mycelial growth through branching hyphae, aka tubular filaments. Dimorphic fungi: yeast or mycelial depending on the environment. Aka yeast looks like bacterial colonies, other types don"t. Chlamydospores: spores with thickened cell wall of hyphae. Conidiospores (conidia): naked spores in chains at hyphal tip. Cells of + thallus and - thallus fuse (dikaryotic stage) After several hours, yrs or centuries nuclei fuse ( diploid stage) Haploid nucleus partitioned into + and - spores. True fungal pathogens e. g. blastomcyes dermatitidis are very difficult to treat. Ti(cid:374)ea or ri(cid:374)g(cid:449)or(cid:373) (cid:894)(cid:374)o (cid:449)or(cid:373) i(cid:374)(cid:448)ol(cid:448)ed it"s a trick(cid:895) Usually introduced by thorn pricks or wood splinters, therefore common in gardeners, farmers. Start from lung infection and spread to other body areas.

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