Fungus Ppt

FUNGUS Biology 202

Introduction to Fungus

  • Overview of Function: Fungi are essential decomposers in ecosystems that break down organic material and recycle nutrients.

Phyla of Fungi

  • Key Phyla:

    • Zygomycota: Commonly known as black bread molds.

    • Ascomycota: Referred to as "sac" or "cup" fungi, includes yeasts and molds like Penicillium.

    • Basidiomycota: Known as "club fungi", includes mushrooms and puffballs.

Structure of Fungi

  • Hyphae and Mycelium:

    • Hyphae: Fine, branching threads that comprise the main components of fungi.

    • Mycelium: A mass of hyphae; increases surface area for nutrient absorption.

  • Fruiting Body: The reproductive structure (e.g., mushrooms) that produces spores.

Reproduction

  • Asexual Reproduction: Molds can produce haploid spores via mitosis; yeasts reproduce through budding.

  • Sexual Reproduction: Involves the formation of fruiting bodies which release sexual spores after the fusion of two mating types.

  • Spores: Fungi produce vast quantities; they can spread through the air or water and germinate in suitable conditions.

Nutritional Methods

  • Absorptive Heterotrophy: Fungi secrete enzymes to break down complex substances externally, absorbing the resulting simple nutrients.

Adaptations and Features

  • Cell Structure: Fungi can be unicellular (e.g., yeast) or multicellular. They possess cell walls made of chitin.

  • Energy Storage: Surplus energy is stored as glycogen, similar to animals.

Evolutionary Relationships

  • Evolutionary Link: Fungi are more closely related to animals than to plants. Molecular and fossil evidence supports this relationship.

  • Oldest Fossils: The oldest fungi fossils date back to approximately 460 million years ago.

Ecological Role

  • Decomposition: Act as decomposers in ecosystems, recycling nutrients.

  • Mutualism and Parasitism: Fungi can engage in mutualistic relationships with plants (e.g., mycorrhizae) or be parasitic.

Human Uses of Fungi

  • Medicinal Uses: Used in the production of antibiotics like penicillin.

  • Food Sources: Many fungi are used in food products, including fermentation processes.

Notable Fungal Diseases

  • Research on Fungal Diseases: Each disease has specific effects, treatment options, and fungal types associated with it.