Lab__4_-_Fungi - Lab #4 The Water Molds and Fungi....

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Lab #4 – The Water Molds and Fungi. Autotroph and Heterotroph Associations Carolyne Moussa
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Microscopic Technique - Connect compound and dissecting microscopes via firewire cables to the computer BEFORE opening Image-Pro Express. - http://salinella.bio.uottawa.ca/BioLabo/
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Kingdom Protista - Unicellular Protists - Two different types are Oomycota and Myxomycota: Fungus-like protists that have the appearance and some basic characteristics of fungi, but are more closely related to the protists in their reproduction and life cycle. 1. Phylum Oomycota (The water molds) – Saprolegnia sp. -. Most species are saprophytic () but there are a few that are parasitic on fish and other animals. -. Has hyphae (cottony mass of filaments) which collectively constitute a mycelium. -. The hyphae are coenocytic meaning that they are without partition and are thus multinucleate. -. The denser areas at the tips of many of the hyphae have individual cells called sporangia (or zoosporangia ) and these cells play a role in the production of asexual motile spores (zoospores). -. If a zoosporangium is ready to discharge, its spores will contain clearly formed zoospores that are rocking back and forth. -. This genus exhibits heterogamy and produces gametes that are male and female. -. The female gametangia or sex organ is the oogonia and has eggs within it. Some oogonia should have antheridia next to them. -. Antheridia is the male gametangia. -. Oogonia and antheridia are both single-celled structutres, but oogonia is several times larger than the antheridia.
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Sex Organs Eggs – Oospores Oogonium A n t h e r id iu m Q: Plant diseases caused by oomycetes? A: Root rot of soybean Black pod of cocoa Blue mold of tobacco
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2. Phylum Myxomycota (The slime molds) – Physarum sp.
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Kindom Fungi 1. Phylum Zygomycota (Black Bread Molds) -. Distributed worldwide with airborne spores found almost everywhere. -. Bakeries add preservatives (calcium propionate) to prevent growing mold on bread. -. Filamentous mycelium is coenocytic (multinucleate) & nonseptate ( no cross walls). -. When a spore lands on a suitable substrate, it germinates and forms a very extensive coenocytic mycelium, whose mat consists mostly of vegetative hyphae, which primarily absorb nutrients from the environment supporting the growth of new hyphae, reproductive spores and sexual spores. -.
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Lab__4_-_Fungi - Lab #4 The Water Molds and Fungi....

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