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. 2014 Aug;19(8):491–500. doi: 10.1016/j.tplants.2014.04.009

Figure I.

Figure I

Pathogen-associated molecular pattern (PAMP)-triggered immunity (PTI) is conserved and this host defence response against apoplastic pathogens (AP) and haustoria-forming (and other cell-penetrating) pathogens (HFP) does not generally differ. Although R gene-mediated resistance operates against both AP and HFP, these defence responses differ in that effector-triggered immunity (ETI) and effector-triggered defence (ETD) operate against HFP and AP, respectively. Specific differences are explained in Table I.