Abstract

Lateral root (LR) formation is a multistep developmental process in which auxin and peptide hormones play essential roles. Recent studies in arabidopsis by Huang etal. and Zhu etal. have revealed that the mitogen-activated protein kinase (MAPK) cascade MKK4/MKK5-MPK3/MPK6 functions in both a noncanonical auxin signaling pathway and the IDA peptide signaling pathway to regulate LR morphogenesis and emergence, respectively.

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