Plant immunity is the set of recognition and response mechanisms by which plants restrict harmful interactions with other organisms. Surface pattern recognition receptors detect characteristic molecular patterns; intracellular nucleotide-binding leucine-rich repeat receptors can detect pathogen-associated activity. These routes interact rather than forming independent, universally sufficient barriers.
An integrated decoy illustrates how recognition can exploit an attacker's own activity: an immune receptor incorporates a structure resembling a target, so modification of that structure can trigger defence. The RRS1-RPS4 receptor pair is an experimentally studied example.[ref]
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