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1. 1 Lecture 19: Biotic stressPlant disease 
2. 2 
3. 3 Bacteria can be 
4. 4 Why do we study plant diseases? 
5. 5 Pseudomonas syringae pv. tomato 
6. 6 Pseudomonas syringae pv. tomato 
7. 7 Pseudomonas syringae pv. tomato causes Bacterial Speck Disease in tomato and Arabidopsis 
8. 8 The Pseudomonas syringae pv. tomato infection process 
9. 9 How do plants defend against disease? 
10. 10 Different plants can have different responses to a pathogen 
11. 11 So how do plants defend against bacteria that enter the cell? 
12. 12 The Hypersensitive Response 
13. 13 Infection of Arabidopsis by Pseudomonas syringae pv. tomato 
14. 14 The Hypersensitive Response 
15. 15 The Hypersensitive Response 
16. 16 Plant disease 
17. 17 Plant disease 
18. 18 Terminology in gene-for-gene resistance  
19. 19 HR vs. Disease 
20. 20 The Hypersensitive Response  An experiment 
21. 21 The Hypersensitive Response  An experiment 
22. 22 The Hypersensitive Response An experiment: Hypotheses 
23. 23 Susceptible vs. resistant plant 
24. 24 Other bacteria that use the Type III Secretion System 
25. 25 The Black Death(aka. The Bubonic Plague) 
26. 26 The Bubonic Plague 
27. 27 The Bubonic Plague 
28. 28 The Spread of the Black Death