07-14-08

07-14-08 - 07-14-08 Ch.31 Fungi A. Concept 31.1: Fungi are...

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07-14-08 Ch.31 Fungi A. Concept 31.1: Fungi are Heterotrophs that feed by absorption a. Fungal Nutrition and Lifestyles i. Fungi are Heterotrophs but do not ingest their food 1. Secrete exoenzymes into their surroundings that breakdown complex molecules 2. Absorb smaller organic molecules b. Fungi exhibit diverse lifestyles i. Decomposers, aka, saprotrophs ii. Parasites iii. Mutualistic symbionts B. Body Structure a. The morphology of multicellular fungi enhances absorption of nutrients b. Fungi consist of hyphae that are groups together into a mycelia c. Most fungi have cell walls made of chitin d. Some fungi have hyphae divided into cells by septa, with pores allowing cell-to-cell movement of materials e. Coencytic fungi lack septa C. Specialized Hyphae a. Some fungi have hyphae that allow them to capture animals and penetrate the tissues of their host b. Mycorrhizae are mutualisms between fungi and plant host i. Ectomycorrhizae – surround root cells ii. Endomycorrihzae – extends hyphae through root-cell wall Concept 31.2 Fungi Produce spores through sexual or asexual life cycles (fig 31.5) D. Sexual Reproduction a. The sexual life cycle involves
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i. Cell Fusion – plasmogamy ii. Nuclear fusion – karyogamy b.
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This note was uploaded on 07/21/2008 for the course BIOL 1202 taught by Professor Gregg during the Summer '08 term at LSU.

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07-14-08 - 07-14-08 Ch.31 Fungi A. Concept 31.1: Fungi are...

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