BIO251 - Lecture 3 7:23 AM Today Fungi and fungal like organisms 6 major groups of fungi Water molds(Oomycetes Slimemolds(Myxomycetes

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Today: Fungi and fungal like organisms Water molds (Oomycetes) Slimemolds (Myxomycetes) Chytrids (Chytridiomycetes) Zygomycetes (Zygomycetes) Ascomycetes (Ascomycetes) Basidiomycetes (Basidiomycetes) 6 major groups of fungi - Polyphyletic group Fungi is artificial group ! - Old oomycetes lost their ability to - Photosynthesize. They were algae thatlost chloroplasts . They resemble closely to Stranomytes Slimemolds - Placed in higher fungi Asco- and Basidiomycetes - Common characteristics of Fungi 2. Specific enzymes secreted into their surroundings to digest specific molecules Smaller sized, broken down products are transported back into the "fungal" cell Each species of "fungus" produces a particular set of extracellular enzymes --> restricted to a narrow diet "Fungi" assimilate nutrients by absorption - They lack chloroplasts Eukaryotic heterotrophs with cell walls - Oomycetes (water molds) 3. Belongs to stramenopiles along with brown algae Similar in how they live and how they absorb food . This is similar to true fungi Phylogenetically unrelated to fungi. It is only similar in morphology and physiology . Mostly parasites 500-800 species Continuous tubes without any walls in-between them Whole organism is one large cell Bur their filaments are Aseptate (coenocytic) Filamentous. This is similar to true fungi Lacks chitin (unlike true fungi). This makes them far apart from true-fungi Cell walls of cellulose (--> stramenopiles) Asexual and sexual reproduction Characteristics - Lecture 3 October 14, 2009 7:23 AM BIO251 Page 1
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are. We will begin the life-cycle with filamentous organism. Sexual reproduction Filaments are diploid (2 sets of chromosome). Note that they are asceptic. On the side tip, you will see globulous features. This is where sexual reproduction occurs. They will produce oogonium (the female reproductive organ). The other end of hyphae will mature into male reproductive organ known as antheridium . They will both go under4 sexual reproduction meiosis . The cells within oogonium and antheridium will then have haploid nuclei. Once meiosis is over, the antheridium will appear to end of oogonium to creat fertilization tube toward it and one of male nuclei tube will transfer to form oospores. The oospores are diploid and immobile. The outcome of sexual reproduction is oospores released from oogonium. Asexual reproduction At some of tips, they grow asexual reproduction structure called zoosporangium. The spores have flagella. These spores are mobile and can move around. They go through cyst stage in which they survive extreme conditions. They eventually germinate and form identical filamentous organisms. This asexual reproduction of creating zoospores are more important!
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This note was uploaded on 06/21/2011 for the course BIO BIO251 taught by Professor Busch during the Fall '11 term at University of Toronto- Toronto.

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BIO251 - Lecture 3 7:23 AM Today Fungi and fungal like organisms 6 major groups of fungi Water molds(Oomycetes Slimemolds(Myxomycetes

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