PBIO 117 Lecture Notes - Lecture 2: Stoma, Necrosis, Pith

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Types of penetration by fungi: direct, through natural openings (ie. stomata, natural wounds. Penetration by bacteria: through stomata (water needed, through wound, hydrathode, nectarthode. Bacteria as a plant pathogen: can cause. Plant pathogenic bacterial: can be grouped based on cell wall structure. Gram positive retain crystal violet stain. Thick layer of peptidoglycan in cell wall. Gram negative- does not retain cv stain. Thinner layer of peptidoglycan (possibly why stain rinses out so. Taxonomy easily: genus species subspecies pathovar. Cankers bird"s eye lesion (raised necrotic spots surrounded by white halo) Stem infection (inner material is reddish brown, necrotic material can fill pith and cause cankers) Plant certified seeds, never use seeds from an infected plant. Most widely known for the production of antibiotics. Pathogen- potato scab (serious disease of roots/tubers) Can survive as a saprophyte (separate from plant) Spread by: water, windblown soil, infected tubers. Produces toxin thaxtomin (required to be pathogenic in potatoes)

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