Jan:
The mechanism of resistance is often very complicated and hard to explain. Here’s a “non-technical” explanation of bacterial speck resistance:
Non Technical Summary
In tomato, resistance to bacterial speck disease is determined by the resistance protein Prf, a host resistance protein with a nucleotide-binding site (NBS) and a region of leucine-rich repeats (LRR). Prf indirectly recognizes either of two effector proteins, AvrPto or AvrPtoB, delivered by the Pseudomonas syringae pathovar tomato (Pst).
Sometimes the resistance results in less disease growth or the resistance allows high pathogen growth with little damage.
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