Mushrooms,etc (23)

Mushrooms,etc (23) - Kingdom Fungi Kingdom Fungi Mushrooms...

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Unformatted text preview: Kingdom Fungi Kingdom Fungi Mushrooms, Mildew, Mold, Morels, Yeasts Characteristics • Kingdom Fungi contains 80,000 spp • Mostly multicellular eukaryotes that share a common mode of nutrition – Heterotrophic ( saprotrophic decomposers ) – Cells release digestive enzymes and then absorb resultant nutrient molecules • Some are parasitic- millions of dollars of crop losses/yr- Human diseases: ringworm, athlete’s foot, yeast infections (fungal infection = mycosis ) • Several have mutualistic relationship Structure- Cell walls of chitin- Excess food stored as glycogen as in animals- Possibly evolved from red algae - both lack flagella Body (thallus) of most fungi is multicellular mycelium (yeasts are unicellular) • Mycelium = Consists of a vast network of thread-like hyphae • Septate fungi have hyphae with cross walls • Nonseptate fungi are multinucleated • Hyphae grow from tip • Give the mycelium a large surface area per unit volume Reproduction Both sexual (in most) and asexual reproduction results in Nonmotile Spores Sexual reproduction involves three stages: Hyphae Haploid, N Dikaryotic stage N + N Diploid stage, 2N meiosis from 2 different mating types Nuclei may not fuse immediately (may be days, months, yrs) zygote spore Asexual Reproduction 1. Production of spores by single mycelium 2. Fragmentation 3. Budding Reproduction During sexual reproduction, hyphae from two different mating types fuse Hyphae that contain paired haploid nuclei are said to be dikaryotic Nuclear fusion produces diploid nucleus , which produces haploid windblown spores by meiosis Spores germinate directly into haploid hyphae without embryological development Asexual reproduction usually involves the production of windblown spores Unicellular yeasts reproduce by budding Fungi evolved - 570 mya...
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This note was uploaded on 04/07/2008 for the course BIO 103 taught by Professor Potts-santone during the Spring '07 term at Northeastern.

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Mushrooms,etc (23) - Kingdom Fungi Kingdom Fungi Mushrooms...

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