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Kingdom Fungi

Kingdom Fungi. Characteristics. Eukaryotes Most are saprobes (live on dead organisms) Grow best in warm, moist environments Mycology is the study of fungi. The Characteristics of Fungi. Absorptive heterotrophs (digest food first & then absorb it into their bodies

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Kingdom Fungi

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  1. Kingdom Fungi

  2. Characteristics

  3. Eukaryotes Most are saprobes (live on dead organisms) Grow best in warm, moist environments Mycology is the study of fungi The Characteristics of Fungi

  4. Absorptive heterotrophs (digest food first & then absorb it into their bodies Release digestive enzymes to break down organic material or their host Store food energy as glycogen The Characteristics of Fungi BREAD MOLD

  5. Cell walls are made of chitin (complex polysaccharide) Body is called the Thallus Grow as microscopictubes or filaments called hyphae The Characteristics of Fungi

  6. Produce both sexual and asexual spores Classified by their sexual reproductive structures The Characteristics of Fungi Spores come in various shapes

  7. Vegetative Structures Mycelium/NON-REPRODUCTIVE

  8. Tubularshape ONE continuous cell Filled with cytoplasm & nuclei Multinucleate Hard cell wall of chitin also in insect exoskeletons The cells of fungi are Hyphae

  9. Stolons – horizontal hyphae that connect groups of hyphae to each other Rhizoids – rootlike parts of hyphae that anchor the fungus Hyphae STOLON RHIZOIDS

  10. Cross-walls called SEPTA may form compartments Septa have pores for movement of cytoplasm Form network called mycelia (non reproductive) that run through the thallus (reproductive body) Hyphae

  11. Absorptive Heterotroph • Fungi get carbon from organic sources • Tips of Hyphae release enzymes • Enzymatic breakdown of substrate • Products diffuse back into hyphae Nucleus “directs” the digestive process Enzymatic breakdown Enzymes Digested material is then used by the hypha

  12. Hyphae grow from their tips Mycelium is an extensive, feeding web of hyphae Mycelia are the ecologically active bodies of fungi Hyphal growth This wall is rigid Only the tip wall is plastic and stretches

  13. REPRODUCTIVE STRUCTURES ASEXUAL & SEXUAL SPORES

  14. Most fungi reproduce Asexually and Sexually by spores ASEXUAL reproduction is most common method & produces genetically identical organisms Fungi reproduce SEXUALLY when conditions are poor & nutrients scarce REPRODUCTION

  15. Spores are an adaptation to life on land Ensure that the species will disperse to new locations Each spore contains a reproductive cell that forms a new organism Nonmotile Dispersed by wind Spores

  16. Sexual Reproduction

  17. Used when environmental conditions are poor (lack of nutrients, space, moisture…) • No male or female fungi • Some fungi show dimorphism • May grow as MYCELIA or a YEAST –LIKE state (Filament at 25oC & Round at 37oC) SEXUAL REPRODUCTION Dimorphic Fungi

  18. Haploid 1n hyphae from 2 mating types (+ and -) FUSE (Fertilization) Forms ahyphae with 2 nuclei that becomes a ZYGOTE The zygote divides to make a SPORE SEXUAL REPRODUCTION - + SPORE FORMS

  19. ASexual Reproduction

  20. Fragmentation – part of the mycelium becomes separated & begins a life of its own • Budding – a small cell forms & gets pinched off as it grows to full size • Used by yeasts • Asexual spores – production of spores by a single mycelium Three types of Asexual Reproduction

  21. Reproduce by spores • Spores may be Formed: • Directly on hyphae • Inside sporangia • On Fruiting bodies Penicillium hyphae Pilobolussporangia Amanita fruiting body

  22. Fruiting Bodies are modified hyphae that make asexual spores An upright stalk called the Sporangiosphore supports the spore case or Sporangium ASEXUAL REPRODUCTION

  23. Types of Fruiting Bodies: • Basidia • Sporangia • Ascus ASEXUAL REPRODUCTION Sporangia Basidia

  24. Fruiting Bodies Both are composed of hyphae mycelium

  25. Mycelia have a huge surface area More surface area aids digestion & absorption of food Hyphal growth from spore Germinating spore mycelium

  26. Evolution of Fungi

  27. Which of the following is most closely related to a mushroom (fungus)? • WHY? Recent DNA-based studies show that fungi are more similar to animals than to plants Cladogram

  28. Evolution of the Fungi

  29. Fungi are classified by their REPRODUCTIVE STRUCTURES and SPORES • The reproductive structures are: • BASIDIA - BASIDIOMYCOTA • SPORANGIA - ZYGOSPORANGIA • ASCUS - ASCOMYCOTA It’s All About the Spores!

  30. Spores are made of: • Dehydrated cytoplasm • Protective coat • Haploid cell • Wind, animals, water, & insects spread spores • Spores germinates when they land on a moist surface (new hyphae form) It’s All About the Spores!

  31. asci basidia zygosporangia Classification & Phylogeny motile spores

  32. Major Groups of Fungi

  33. Major Groups of Fungi • Within the past few years, several groups have been re-classified into the protists • Two of these groups are the slime molds and water molds

  34. Saprobes • Decomposers • Molds, mushrooms, etc. • Parasites • Harm host • Rusts and smuts (attack plants) • Mutualists • Both benefit • Lichens • Mycorrhizas Classification by Nutrition

  35. Major Groups of Fungi • Basidiomycota – Club Fungi • Zygomycota – Bread Molds • Chytridiomycota – Chytrids • Ascomycota – Sac Fungi • Lichens/Mycorrhizas– Symbiosis (plant or algae & Fungi)

  36. ZYGOmycota

  37. Zygomycota Rhizopus on strawberries • Called the sporangiumfungi • Commonly called molds • Also includes blights • Hyphae have no cross walls (aseptate) • Grow rapidly • Includes bread moldRhizopus stolonifer Tomato Blight

  38. Zygomycota • Asexual reproductive structure called sporangiumatop sporangiospores make spores • Rhizoids anchor the mold & release digestive enzymes & absorb food • Stolonsconnect the fruiting bodies

  39. Zygomycota • Sexual spores are produced by conjugation when (+) hyphae and (-) hyphae fuse • Sexual spores are called ZYGOSPORES • Zygospores can endure harsh environments until conditions improve zygospore

  40. Basidiomycota

  41. Basidiomycota • CalledClub fungi • Includes: • Mushrooms • Toadstools • Bracket & Shelf fungi • Puffballs • Stinkhorns • Rusts and smuts

  42. Some are used as food (mushrooms) Others damage crops (rusts & smuts) USES For Basidiomycota Portobello Mushrooms Soybean Rust Corn Smut

  43. Seldom reproduce asexually The visible mushroom is a fruiting body Basidiocarp(fruiting body) is made of a stalk called the stipeand a flattened cap with gills called Basidia underneath Basidiospores are found on basidia Annulus and Volvais a skirt-like ring around some stipes Vegetative structures found below ground: Mycelium Characteristics of Club Fungi

  44. Hyphal fusion of haploid mycelia mycelium and fruiting body are dikaryotic Mushroom Life Cycle haploid mycelium N 2N N+N Meiosis Nuclear fusion in basidium Fig 31.12 young basidia - the only diploid cells

  45. Ascomycota

  46. Characteristics • CalledSac fungi • IncludesCup fungi, morels, truffles, yeasts, and mildew • May be plant parasites (Dutch elm disease and Chestnut blight) • Reproduce sexually & asexually • Ascus - sac that makes ascospores in sexual reproduction • Specialized hyphae known as Ascocarps contain the asci

  47. Characteristics • Yeasts reproduce asexually by budding (buds break off to make more yeast cells) • Asexual spores called conidia form on the tips of special hyphae called conidiophores CONIDIA

  48. Conidia Formation

  49. Yeasts Budding Saccharomyces

  50. Uses of Ascomycetes • Trufflesandmorelsare good examples of edible ascomycetes • Penicillium mold makes the antibiotic penicillin. • Some ascomycetes also gives flavor to certain cheeses. • Saccharomyces cerevesiae (yeast) is used to make bread rise and to ferment beer & wine.

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