Lecture 2 - Fungi What are Fungi? - Eukaryotes - Cell walls...

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Fungi What are Fungi? - Eukaryotes - Cell walls of chitin - Absorptive heterotrophs - Exoenzymes: digest food outside body - Food obtained from variety of sources - Lifestyle - Decomposers (saprobes) - Parasites. 80% of plant parasites are fungi - Mutualistic symbionts Form and Function - Single Cell - Yeasts: single cell fungus - Reproduce through asexual budding - Multicellular - Hyphae: ±lamentous cell - Septate hypha - Have nuclei, cell wall, pore, and septum - Pores allow ribosomes, mitochondria, and nuclei to pass - Coenocytic hypha - Only has nuclei and cell wall - Mycelium: Hyphae mass. - Majority underground - 1 cm^3 of soil may have 1 km of hyphae
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Specialized Hyphae - Haustoria: specialized hyphae that exchanges (mutualistic) or extracts (parasitic) nutrients with a host - Mycorrhizae: mutualistic haustoria; associates with plant roots and improves water/nutrient uptake - Fungus Trap: parasitic haustoria; associates with nematodes and extracts nutrients Reproduction - Asexual - Produces spores - Sexual
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Lecture 2 - Fungi What are Fungi? - Eukaryotes - Cell walls...

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