Biology 3218F/G Lecture Notes - Lecture 7: Saprotrophic Nutrition, Zygote, Plasmogamy
20 Sep 2016
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Document Summary
Zygomycota are characterized by filamentous growth (i. e. hyphae) (chytrids and fungus-like organisms like oomycota have thalli instead of filamentous hyphae) Glomeromycota used to be an order of zygomycota but is now a phylum b/c of dna evidence. Consist of several main groups, each of which may have separate evolutionary origins, so zygomycota are not a monophyletic group, but it"s convenient to talk about them as one group. Very broad hyphae; instead of looking like threads, they"re big enough to see cytoplasmic streaming within the hyphae; their nuclei and vacuoles will go streaming by in one or two directions. The hyphae are coenocytic: having multiple nuclei within a single cell, so when nuclei divide they are not immediately separated by cells/septa. They produce asexual sporangiospore: spore produced in a sporangium (sac that produces sporangiospores) When it has sex, it produces diploid zygospores by fusion of the 2 compatible haploids; zygospore: single cell with plasmogamy and then karyogamy.
