BIO 111 Chapter Notes - Chapter 22: Pathogenic Fungus, Saprotrophic Nutrition, Heterotroph
Document Summary
Absorptive heterotrophy a process of secreting digestive enzymes to break down large molecules in the environment and then reabsorbing the breakdown products through the fungal cell membrane. Opishthokonts the clade which includes the fungi, choanoflagellates, and animals. Synapomorphies of fungi absorptive heterotrophy: chitin a structural polysaccharide in fungal cell walls. Unicellular yeasts absorb nutrients directly: yeasts unicellular free-living fungi (yeast is more of a lifestyle than a taxonomic group) Fungi are in intimate contact with their environment: mushrooms have a huge sa-v ratio allowing them to undergo absorptive heterotrophy, but means they lose a lot of water, mushrooms have a large tolerance for conditions. Can live in hypertonic areas and very cold or very warm areas. 22. 2 fungi can be saprobic, parasitic, predatory, or mutualistic. Endophytic fungi: endophytic fungi fungi that live within aboveground parts of plants without causing obvious deleterious symptoms, in fact some plants have shown they are more resistant to pathogens, herbivores, and stress.
