MICR 3220 Lecture Notes - Lecture 26: Root Rot, Zoospore, Armillaria
15 Jan 2019
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Document Summary
The hyphae growing into the root tissue is what causes the rotting. This causes the production of sporangia (the asexual spores for oomycetes and oopsores the sexual spore). These can be formed inside of the infected tissue or outside of the tissue. This can lead to the production of chlamydospores. The sporangia will divide and form into zoospores that have flagella. The zoospores will use their flagella for chemotaxis and follow the nutrient trail from low concentration to high in our root (the rhizosphere effect). Once they arrive, the flagella will insist (shed). Total: three different kind of spores: two asexual and one sexual: pythium needs high soil moisture this is how it causes rot. Low soil moisture prevents pythium from developing root rot: high soil moisture needed because: Zoospore release: low moisture prevents the sporangia from maturing into zoospores (remember zoospores have flagella and thus can move through water: water logging: gasses lix oxygen can not diffuse very well.
