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Summary    Peptide‐receptor signaling is an important system for intercellular communication, regulating many developmental processes. A single process can be controlled by several distinct signaling peptides. However, since peptide‐receptor modules are usually studied separately, their mechanistic interactions remain largely unexplored.  Two phylogenetically unrelated peptide‐receptor modules, GLV6/GLV10‐RGI and TOLS2/PIP2‐RLK7, independently described as inhibitors of lateral root initiation, show striking similarities between their expression patterns and gain‐ and loss‐of‐function phenotypes, suggesting a common function during lateral root spacing and initiation.  The GLV6/GLV10‐RGI and TOLS2/PIP2‐RLK7 modules trigger similar transcriptional changes, likely in part via WRKY transcription factors. Their overlapping set of response genes includes  PUCHI  and  PLT5 , both required for the effect of GLV6/10, as well as TOLS2, on lateral root initiation. Furthermore, both modules require the activity of MPK6 and can independently trigger MPK3/MPK6 phosphorylation.  The GLV6/10 and TOLS2/PIP2 signaling pathways seem to converge in the activation of MPK3/MPK6, leading to the induction of a similar transcriptional response in the same target cells, thereby regulating lateral root initiation through a (partially) common mechanism. Convergence of signaling pathways downstream of phylogenetically unrelated peptide‐receptor modules adds an additional, and hitherto unrecognized, level of complexity to intercellular communication networks in plants.

new phytologist

Two phylogenetically unrelated peptide‐receptor modules jointly regulate lateral root initiation via a partially shared signaling pathway in  Arabidopsis thaliana