Microbe

Pattern-triggered immunity is activated by recognition of microbe-derived structures by host pattern recognition receptors. Here the authors use a genotype-by sequencing approach to show that bacterial translation initiation factor 1 triggers PTI in Arabidopsis thaliana after recognition by the RLP32 receptor.

The Arabidopsis leucine-rich repeat receptor-like protein RLP42 perceives a 9-amino-acid peptide contained in a fungal endopolygalacturonase. Other Brassica species perceive different epitopes, highlighting rapid and convergent evolution to ensure immunity against pathogenic microbes.