01:119:116 Lecture Notes - Lecture 4: Arbuscular Mycorrhiza, Mycelium, Hypha
15 Mar 2016
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Document Summary
All absorptive heterotrophs: do not ingest food, resource acquisition. Reciprocate with actions that benefit the host: cell wall - chitin. Expands into food resources: types of hypha(e) Organelles and cytoplasm to move in between cells. Fruiting body: mushroom, fig 31. 2, fig 31. 3, specialized hyphae. Some used for feeding on living animals. Used to extract nutrients from, or exchange nutrients with, plant hosts. Mutually beneficial relationships between fungi and plant roots. Mycorrhizal fungi more efficient than plant roots at getting soil nutrients. Plants supply fungi with organic nutrients such as carbs. Form sheaths of hyphae over a root and also grow into extracellular spaces of the root. Extend hyphae through the cell walls of root cells and into tubes formed by invagination of the root cell membrane (cid:1) Spore: haploid (n, produced either at end of a hypha or in fruiting body, sexually or asexually, no flagella. Not motile: moist environment with food.
