GAVILAN BIO 5 - Fungi (78 pages)

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Fungi



Previewing pages 1, 2, 3, 4, 5, 37, 38, 39, 40, 41, 42, 74, 75, 76, 77, 78 of actual document.

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Fungi

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Pages:
78
School:
Gavilan College
Course:
Bio 5 - General Botany

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Chapter 14 Fungi Importance of Fungi Together with Heterotrophic bacteria Ecological decomposers Decomposing fruit Rhizopus Root rot fungus white mycelial causes disease in living trees Acts as decomposers on dead plants Root rot Ouch Fungi Composed of Hyphae Heterotrophic absorbers Characteristics of Fungi Composed of Hyphae Fungal filaments Cobwebby strands of subterranean white stuff Mycelium Fungi form important symbiotic relationships 80 of all vascular plants species from mutually beneficial associations called mycorrhizae between roots and fungi Plant nutrition Lichens form symbiotic relationship with fungi algal or cyanobacterial cells Four phyla of fungi Chytridiomycota Zygomycota Ascomycota Basidiomycota Chars of Fungi All have cell wall Cell wall composed of polysaccharide chitin Chitin more resistant to microbial degradation than cellulose All Fungi Heterotrophic Absorbers Unable to engulf small microorganisms Secrete enzymes and absorb smaller molecules Absorb food mostly at or near the growing tips of their hyphae Fungi obtain their food Either as Saprophytes or As mutualistic symbionts Some Obtain energy through fermenation producing ethyl alcohol from glucose i e yeast Fungi reproduce both sexually and asexually Reproduce through the formation of spores that are produced sexually or asexually Most are nonmotile spores Some are dry and small and airborne Common method of asexual reproduction in fungi By means of spores Either produced in sporangia The sporangium is a saclike structure the entire contents of which are converted into one or more spores Asexual reproduction Vegetative reproduction Or Hyphal cells called conidiogenous cells Spores produced by conidiogenous cells occur singly or in chains called conidia Asexual repro Some Reproduce by fragmentation of their hyphae Sexual reproduction Three distinct phases First two are phases of fertilization syngamy Plasmogamy the fusion of protoplasts Karyogamy the fusion of nuclei some don t fuse



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