LEC 24 - Symbiosis- mutualists Mycorrhiza - a fungal root?...

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Unformatted text preview: Symbiosis- mutualists Mycorrhiza - a fungal root? Plant In Greek, Myko = fungus Rhiz = root Fungus What benefit do you think that the fungus receives from the plant? 1. Water 2. Carbon 3. Nitrogen 4. Phosphorus Fixed carbon (i.e., sugars) Plant Fungus Mineral nutrients P, N, K, & micronutrients Water Common mycorrhizal network Uses of mycorrhizae Agriculture Establishment of exotic pine plantations Restoration- beaches Restoration- clear cuts * Lineages with mycorrhizal fungi - the mycorrhizal symbiosis has evolved multiple times * * * Lichen Tree Chytrids • Only fungi with swimming spores • Swimming spores have been lost in all other fungal lineages Chytridiomycosis caused by Batrachochytrium dendrobatides Basidiomycota Basidiospores Basidium Basidiomycota fruiting bodies Basidiomycota without fruiting bodies Ascomycota ascospores ascus Ascomycota Basidiomycota Basidium and basidiospores Ascus and ascospores Ascomycota fruiting bodies Asexual reproduction- mitospores Based on rDNA sequences & fossils Ascomycota Basidiomycota Glomeromycota Ascomycota Basidiomycota Ascomycota Basidiomycota Basidiomycota What do you think would be the main selection pressure for the evolution of an enclosed fruiting body? 1. Dry conditions 2. Wet conditions 3. Cool conditions Above ground Below ground What do you think is the main form of spore dispersal of underground fruiting bodies? 1. 2. 3. 4. 5. Water Air Forcible discharge of spores Animals Outer wall of fruiting body dissolves Asexual reproduction is: 1. 2. 3. 4. 5. 6. 7. reproduction without the fusion of gametes reproduction without the influence of mutations reproduction without meiosis reproduction without mitosis Both choices 1 and 2 Both choices 1 and 3 Both choices 2 and 3 Basic life cycle of Ascomycota & Basidiomycota ...
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This note was uploaded on 04/19/2009 for the course BIS BIS 2C taught by Professor 3differentprofs during the Winter '09 term at UC Davis.

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LEC 24 - Symbiosis- mutualists Mycorrhiza - a fungal root?...

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