Effector-triggered immunity in oilseed crops is expanded despite the restricted specificity of the receptor ZAR1.

Brassica napus and Camelina sativa show expanded effector-triggered immunity, with 44.6% and 55.4% of 65 Pseudomonas syringae effector families containing alleles that elicit ETI.

• Why it matters: Translation of Arabidopsis thaliana ETI knowledge to crop protection is limited because ETI landscapes in related oilseed crops have not been mapped.
• What they did: A comprehensive screen tested 529 P. syringae type III effectors for ETI elicitation in B. napus and C. sativa, then mapped ETI-elicitor homologs onto a P. syringae phylogeny.
• The result: Strains carry three or more predicted ETI elicitors in 79% (B. napus) and 88% (C. sativa), and ETI response number correlates with NLR repertoire size and ploidy.