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BIS 2C lect 24 Rizzo - Symbiosis parasites Plant parasites majority of plant pathogens are fungi Chestnut Blight Cryphonectria parasitica

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Symbiosis- parasites
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Plant parasites - majority of plant pathogens are fungi
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Chestnut Blight Cryphonectria parasitica
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Pitch canker Fusarium circinatum White Pine Blister Rust Cronartium ribicola Introduced Pathogens - pathogen and host not co-evolved, therefore limited resistance in the host to infection
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Animal parasites
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Cordyceps species
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Cordyceps sinensis
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Geomyces destructans White Nose syndrome
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Distribution and spread of white nose syndrome of bats
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Distribution and spread of white nose syndrome of bats
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Symbiosis- mutualists Mycorrhizae Lichens Animal mutualists Endophytes
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Mycorrhiza - a fungal root? Plant Fungus In Greek, Myko = fungus Rhiz = root
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Plant Fungus P, N, K, & micronutrients Water
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Plant Fungus P, N, K, & micronutrients Water ? What does the plant provide the fungus? A. Protection from the environment B. Protection from pathogens C. Carbon (i.e., sugar) D. Secondary metabolites that increase longevity of hyphae
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Plant Fungus P, N, K, & micronutrients Water Fixed carbon (i.e., sugars)
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Other benefits to plants Protection from root pathogens Increased longevity of fine roots Protection from heavy metals in soil Linkages between plants (common mycorrhical network)
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Plant 1 Fungus 3 Fungus 4 Fungus 2 Fungus N Fungus 1 Plant 2
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Overall benefit to individual plants = growth enhancement No mycorrhizae mycorrhizae No mycorrhizae mycorrhizae
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Major groups of Fungi * * *
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Ectomycorrhizae – Ascomycota, Basidiomycota
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Ectomycorrhizae- external mantle of hyphae on fine roots
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Boletes Chantrelles Matsutake Truffles
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This document was uploaded on 03/18/2012.

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BIS 2C lect 24 Rizzo - Symbiosis parasites Plant parasites majority of plant pathogens are fungi Chestnut Blight Cryphonectria parasitica

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