As part of their immune system, plants have pattern recognition receptors (
PRRs) that can detect a broad range of microbe-associated molecular patterns (
MAMPs). Here, we identified a
PRR of
Arabidopsis thaliana with specificity for the bacterial
MAMP eMax from xanthomonads. Response to eMax seems to be restricted to the
Brassicaceae family and also varied among different accessions of
Arabidopsis. In crosses between sensitive accessions and the insensitive accession Shakhdara, eMax perception mapped to
RECEPTOR-LIKE PROTEIN1 (
RLP1). Functional complementation of
rlp1 mutants required gene constructs that code for a longer version of RLP1 that we termed ReMAX (for receptor of eMax). ReMAX/RLP1 is a typical RLP with structural similarity to the tomato (
Solanum lycopersicum) RLP Eix2, which detects fungal xylanase as a
MAMP. Attempts to demonstrate receptor function by interfamily transfer of
ReMAX to
Nicotiana benthamiana were successful after using hybrid receptors with the C-terminal part of ReMAX replaced by that of Eix2. These results show that ReMAX determines specificity for eMax. They also demonstrate hybrid receptor technology as a promising tool to overcome problems that impede interfamily transfer of
PRRs to enhance pathogen detection in crop plants.
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