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FUNGUS-LIKE PROTISTS

FUNGUS-LIKE PROTISTS. Phylum Myxomycota Phylum Acrasiomycota Phylum Oomycota. http://www.nytimes.com/2011/10/04/science/04slime.html?_r=5&pagewanted=all&. CHARACTERISTICS. why fungus-like? appearance mode of nutrition with centrioles no chitin in cell walls non-photosynthetic

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FUNGUS-LIKE PROTISTS

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  1. FUNGUS-LIKE PROTISTS Phylum Myxomycota Phylum Acrasiomycota Phylum Oomycota http://www.nytimes.com/2011/10/04/science/04slime.html?_r=5&pagewanted=all&

  2. CHARACTERISTICS • why fungus-like? • appearance • mode of nutrition • with centrioles • no chitin in cell walls • non-photosynthetic • 2-stage life cycle • spore-bearing mold-like stage • free-living amoeba-like stage Stemonitis fusca Comatrichatyphoides http://tywkiwdbi.blogspot.com/2011/11/slime-mold.html, http://www.nationalgeographicstock.com/comp/04/442/1030283.jpg

  3. Dominant state near rich sources of food (phagocytic) Fruiting body Spore-bearing structure Cells aggregate into a slimy mass when food is scarce and moves to a better location http://www.nsf.gov/od/lpa/news/03/pr03106_images.htm

  4. SLIME MOLDS • Phylum Myxomycota Acellular slime molds • Phylum Acrasiomycota Cellular slime molds

  5. Phylum MyxomycotaAcellular or plasmodial slime molds • plasmodium • large cytoplasmic mass (multinucleate) • feeding stage • unfavorable conditions: “fruiting” • sporangia spring up from plasmodium • meiosis  haploid spores flagellated gametes →diploid zygote (sexual reproduction) →*diploid amoeboid cells • e.g. Physarum http://biodidac.bio.uottawa.ca

  6. http://home.sandiego.edu/~gmorse/2009BIOL221/Study_guide2/plasmodial.jpghttp://home.sandiego.edu/~gmorse/2009BIOL221/Study_guide2/plasmodial.jpg

  7. Physarumpolycephalum

  8. Comatricha typhoides

  9. Lycolaga epinendrum“wolf’s milk”

  10. Stemonitis splendens“chocolate tube slime”

  11. Arcyris denudata“carnival candy slime”

  12. Brefeldia maxima“tapioca slime”

  13. Tubifera ferruginosa“red raspberry slime”

  14. http://xkcd.com/877/ , http://www.uknature.co.uk/F.septica.jpg, http://i55.tinypic.com/313k32b.jpg, http://i56.tinypic.com/flly6t.jpg

  15. Phylum Acrasiomycotacellular slime molds • pseudoplasmodium • separated by cell membranes • cell aggregation • slug-like form • migrates to form fruiting body • spores by mitosis • e.g. Dictyostelium discoideum

  16. Phylum Oomycotawater molds/downy mildew • cellulosic cell wall • live on organic matter in water, plant parasites on land • hyphae finely-branched single-celled filaments • coenocytic/aseptate no walls between cells • motile spores Phytophthora infestans  http://www.bluepointenvironmental.com/wp-content/uploads/2012/01/coenocytic-hyphae-60x-LP.jpg

  17. Significance • decomposers • food source of other organisms • parasites of plants (grapes, tomatoes, potatoes) and animals • used to plan routes (shortest distance) • rich areas for biological study http://www.gardencentre.ie/blog/wp-content/uploads/2012/05/potato-blight.jpg, http://media.treehugger.com/assets/images/2011/10/tokyo-mold-railway.jpg

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