Host: The Japanese Society of Plant Physiologists
Pages 0098
Pattern formation along the central-peripheral axis is a fundamental process in the development of vascular plans. Arabidopsis roots are consisted of central stele surrounded by ground tissue (endodermis and cortex), epidermis and lateral root cap. It has been shown that communication between stele and ground tissue layers is mediated by plant-specific GRAS-type transcription factors, SHORT-ROOT (SHR) and SCARECROW (SCR), and that this pathway is crucial for endodermis formation. SHR is produced in the stele and moves into the outer ground tissue, where it interacts with SCR. The SHR-SCR protein complex thus formed specifies single layer of endodermis.
Here, we report a novel function of SCR. SCR restricts expression domain of the class III HD-ZIP transcriptional factor, PHABULOSA (PHB), to vascular tissue via transcription of microRNA165/166. We will also discuss biological significance of the non-cell-autonomous function of miR165/166 in the Arabidopsis root radial patterning.
