CEPR1 function across plant lineages: peptide hormone recognition by cereal crop orthologs and developmental roles in barley.

Arabidopsis peptide hormones from the C-TERMINALLY ENCODED PEPTIDE (CEP) family and their receptor, CEP RECEPTOR1 (CEPR1), integrate growth and development with environmental cues. Since cereals display anatomical differences to dicots, it is unknown if CEPR1 functions similarly in monocots and dicots. We investigated cereal CEPR1 function by introducing putative barley, rice, or maize CEPR1 orthologues into an Arabidopsis cepr1 mutant to determine if its diverse root, vegetative development, and fecundity phenotypes could be restored.

CEP signaling coordinates plant immunity with nitrogen status.

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.

The NIN transcription factor coordinates CEP and CLE signaling peptides that regulate nodulation antagonistically.

Legumes tightly regulate nodule number to balance the cost of supporting symbiotic rhizobia with the benefits of nitrogen fixation. C-terminally Encoded Peptides (CEPs) and CLAVATA3-like (CLE) peptides positively and negatively regulate nodulation, respectively, through independent systemic pathways, but how these regulations are coordinated remains unknown. Here, we show that rhizobia, Nod Factors, and cytokinins induce a symbiosis-specific CEP gene, MtCEP7, which positively regulates rhizobial infection.

The Rhizobium leguminosarum biovar trifolii ANU794 induces novel developmental responses on the subterranean clover cultivar Woogenellup.

The clover-nodulating Rhizobium leguminosarum bv. trifolii ANU794 initiates normal root-nodule development with abnormally low efficiency on the Trifolium subterraneum cv. Woogenellup.