Plant Pathogenic Bacteria

Taxonomy & Nomenclature
1. 6 main genera of free living pathogenic bacteria
  1. Agrobacterium
    1. Clavibacter & Curtobacterium
      1. Erwinia
        Pseudomonas
        Xanthomonas
        Streptomyces
2. Other
  1. Xylem inhabiting fastidious bacteria
    1. Phloem inhabiting fastidious bacteria
      1. eg. Liberobacter
    2. eg. Xylella
Bacterial nomenclature
Bacterial morphology
1. rods (except Streptomyces)
  1. flagella (except Streptomyces & fastidious bacteria)
    1. non spore forming
      1. gram negative (except Clavibacter and Curtobacterium)
Growth requirements
1. aerobes (need oxygen)
  1. need water
    1. 25-30 degree celcius
      1. mostly saprophytes
        nectrotrophes
Bacterial Identification
1. pathogenicity & host symptoms
  1. morphology
    1. biochemical properties
      1. genome sequence (eg. 16s RNA)
How Bacteria attack plants
1. produce extracellular compound
  1. polysaccharides
    1. enzymes
      1. toxin
        growth regulators
        roles in pathogenicity
        roles in pathogenicity
      2. roles in pathogenicity
    2. general properties
    3. roles in pathogenicity
Summary of pathogenicity
Plant response to bacterial infection
1. Immune
  1. Hypersensitive necrotic reaction
    1. Susceptible necrotic reaction
      1. susceptible non-necrotic reaction
        galls
      2. vascular wilts
      3. soft rots

Zusammenfassung der Ressource

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