Chapter 31- Kingdom Fungi

Chapter 31- Kingdom Fungi - Chapter 31 Kingdom Fungi...

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Chapter 31 – Kingdom Fungi (Domain Eukarya) Biggest organism – fungus Armillaria bulbosa – largest and oldest fungus o A single clone of the “honey mushroom” Armillaria can cover more than 2,200 acres (1,600 football fields) Fungi feed by absorption, eukaryotic, multicellular. Give off enzymes into their environment and absorb the digestive material into those cells What organelle does fungi not have? o THEY DON’T HAVE CHOLORPLAST – they don’t do photosynthesis, don’t make chlorophyll Anatomy of Fungi (figure 31. 2) Hyphae – thread-like filaments, one cell think. Forms a long tube of cells Mycelium - interwoven mass of hyphae 2 types of Hyphae 1. Septate hypha – seperations between the cennls for controlled movement 2. Aseptate hypha aka coenocytic Cell walls that surround the hyphae contains chitin – polysahcharide and you have nitrogen of the end (makes chitin) Fungal Form and Function Unlike planks and animals, no distinct embryo is formed during early development During the adult stage, they are immobile Nutrition Chemoheterotrophic – breaking down organism and then taking in the chemicals, take up nutrients, lipids, amino acids, etc. fungi exude exoenzymes that break down organic molecules that the fungi can absorb and use as a supply of both energy and carbon 2 different lifestyles for nutrition
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1. Saprobic – digest dead organisms and waste products . Great decomposers of nature (fungus) gives off enzymes to break down decomposing organism so it can acquire what’s left 2. Parasitic – digest live organisms Mutualistically symbiotic – form associations with other organisms for mutual benefit Fungal Life cycles Three ploidy types 1. Haploid – most fungal hyphae and all spores have haploid nuclei (one copy of chromosomes) 2. Diploid – diploid nuclei are found transiently during the sexual phase(if present) 3. Heterokaryon – unfused nuclei from different parents occupying the same unit Reproduction Asexual – default mode under stable conditions; spores are produced. Produces spores through mitosis and produce haploid spores o Disadvantage: Spores are genetically identical to original mycelium – very little if
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This note was uploaded on 02/05/2011 for the course BIOL 1202 taught by Professor Gregg during the Spring '08 term at LSU.

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Chapter 31- Kingdom Fungi - Chapter 31 Kingdom Fungi...

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