RPS5 and infection: Resistance against P.s.t. DC3000 expressing either avrRps4 (recognized by the TIR-NB-LRR R protein RESISTANT TO P. SYRINGAE 4; RPS4) or avrPphB (recognized by the CC-NB-LRR R protein RPS5) is compromised in mac3a mac3b double mutants but is unaffected in mac3a or mac3b single mutants, as indicated by an approximate 10-fold increase in bacterial growth in mac3a mac3b plants three days after infection compared to Col-0 (Figure 3A and 3B).