01:119:116 Lecture Notes - Lecture 4: Mating Type, Mycelium, Sexual Reproduction
25 Jul 2017
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Document Summary
Evolution of fungi: seq evolution of fungi. Fungal reproduction: seq, c/c fungal life cycles. Fungi on land before plants (land plants ~470 mya) Before plants green slime terrestrial life. Secrete hydrolases hydrolytic enzymes that promote hydrolyses. Grow best in moist environments allows nutrients to move around more. Decomposers absorb nutrients from non-living organic material (ex. fungi on fallen tree) Extremely important ecologically allow nutrients to recycle back into environment. Parasites absorb nutrients from cells of living hosts (ex. athlete"s foot) Mutualists absorb nutrients from a host organism, but reciprocate to host"s benefit. Unique cell wall material sets fungus apart from other organisms. But . common ancestor of all fungi was multicellular. Unicellularity is a secondary derived trait (evolutionary reversal) Basic building of fungus body (looks like spider web when magnified) Hyphae grow longer allow fungus to expand to new food source. Fungi can"t move once hyphae are rooted, but can expand. Feeding network that grows around and within food source.
