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Rzemieniewski, J.* ; Leicher, H.* ; Lee, H.K.* ; Broyart, C.* ; Nayem, S. ; Wiese, C.* ; Maroschek, J.* ; Camgöz, Z.* ; Olsson Lalun, V.* ; Djordjevic, M.A.* ; Vlot, A.C. ; Hückelhoven, R.* ; Santiago, J.* ; Stegmann, M.*

CEP signaling coordinates plant immunity with nitrogen status.

Nat. Commun. 15:10686 (2024)

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Plant endogenous signaling peptides shape growth, development and adaptations to biotic and abiotic stress. Here, we identify C-TERMINALLY ENCODED PEPTIDEs (CEPs) as immune-modulatory phytocytokines in Arabidopsis thaliana. Our data reveals that CEPs induce immune outputs and are required to mount resistance against the leaf-infecting bacterial pathogen Pseudomonas syringae pv. tomato. We show that effective immunity requires CEP perception by tissue-specific CEP RECEPTOR 1 (CEPR1) and CEPR2. Moreover, we identify the related RECEPTOR-LIKE KINASE 7 (RLK7) as a CEP4-specific CEP receptor contributing to CEP-mediated immunity, suggesting a complex interplay of multiple CEP ligands and receptors in different tissues during biotic stress. CEPs have a known role in the regulation of root growth and systemic nitrogen (N)-demand signaling. We provide evidence that CEPs and their receptors promote immunity in an N status-dependent manner, suggesting a previously unknown molecular crosstalk between plant nutrition and cell surface immunity. We propose that CEPs and their receptors are central regulators for the adaptation of biotic stress responses to plant-available resources.

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