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Bacterial Plant Pathogens

Bacterial Plant Pathogens. What are bacteria? Bacterial identification Generalized disease cycle Disease symptoms Disease control. Bacterial Plant Pathogens. Size (0.3-1.5 x 0.7-5 u m ). Generally single celled. Reproduce by simple fission. Prokaryotes. No membrane bound nucleus

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Bacterial Plant Pathogens

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  1. Bacterial Plant Pathogens • What are bacteria? • Bacterial identification • Generalized disease cycle • Disease symptoms • Disease control

  2. Bacterial Plant Pathogens Size (0.3-1.5 x 0.7-5 um) Generally single celled Reproduce by simple fission

  3. Prokaryotes No membrane bound nucleus or organelles Single circular chromosome Lack chlorophyll Most have cell wall Some are motile – flagellum (a)

  4. Identification Structure cell shape colony appearance motility (flagella)

  5. Identification Biochemical cell wall composition

  6. Identification Respiration aerobic, anaerobic, facultative anaerobic Nutritional requirement (C, N, {Biolog}) Fatty acids {FAME} Serology Nucleic acids

  7. Identification Pathogenicity

  8. Plant Pathogenic Bacteria (for PLPA3004) • 8 genera of bacteria, 1 of uncertain ID • 2 genera of Mollicutes (lack cell walls • Approximately 50-60 spp. (200 pathovars {pv.}) • Pathovar – pathogenic on a specific host (crop)

  9. Plant Pathogenic Bacteria (for PLPA3004) • Most are facultative parasites, • Except fastidious bacteria and mollicutes • Most are gram-, rod-shaped bacteria

  10. Fastidious vascular bacteria • Vectored by leafhoppers, except Clavibacter • Unknown-phloem limited bacterium not culturable • Symptoms – stunting, leaf scalding, decline • Xylella – Pierce’s disease of grape

  11. Mollicutes • Lack cell wall • Phloem limited • Transmitted by leafhoppers • Phytoplasmas – amorphous • Spiroplasmas - helical • Symptoms – yellows diseases, witches’ brooming, stunting • Sensitive to Tetracycline

  12. Disease cycle Overseasoning 2 cycle o Reproduction Dissemination Disease development Penetration

  13. Disease cycle Protected environment

  14. Disease cycle • short distance • 1.Water • 2. Soil • 3. Tools and equipment • 4. Insects

  15. Disease cycle

  16. Disease cycle

  17. Disease cycle

  18. Disease cycle

  19. Disease control

  20. Disease Control

  21. Disease Control

  22. Disease Control

  23. Symptoms

  24. Symptoms

  25. Symptoms

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