MICR 3220 Lecture Notes - Lecture 28: Hartig Net, Basidiomycota, Drought Tolerance
15 Jan 2019
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Monday november 19 t h: benefits, drought tolerance: hyphae are able to take up water, the water moves up from the hyphae to the arbuscule and through the plant extends the absorptive zone. This is caused by changes in hormones of the root which changes the growth pattern. Sheaths can grow so large that you cannot see the root: benefits to the plant, absorptive zone: the hyphae extend the absorptive zone by growing further into the soil. Able to grab phosphorus further out in the soil and grab it back. 90% of roots show that phosphorus is in sheath. Able to decompose dead material such as leaf litter, dead insects. Some of the nitrogen comes back through the hyphae, through the sheath, and through the hartig net. 90% of the phosphorus is coming from the mycorrhiza sheath. Evolution of plants (in relevance to the endo- and ecto- mycorrhizae): localized or systemic: primitive plants do not have leaves or true roots.
