Transcriptional control of tissue formation throughout root development

Multifunctional root regulators The growing plant root undergoes a variety of developmental steps that determine thickness and branching as the roots elaborate. Moreno-Risueno et al. identify a suite of transcription factors, some of which mobilize between cells, that regulate shifting fates during root growth. The same set of transcription factors governs identity and proliferation of the stem cells as well as the fates of daughter cells. Science, this issue p. 426 Plant tissue organization is maintained at all formative steps during root growth by the same set of transcription factors. Tissue patterns are dynamically maintained. Continuous formation of plant tissues during postembryonic growth requires asymmetric divisions and the specification of cell lineages. We show that the BIRDs and SCARECROW regulate lineage identity, positional signals, patterning, and formative divisions throughout Arabidopsis root growth. These transcription factors are postembryonic determinants of the ground tissue stem cells and their lineage. Upon further activation by the positional signal SHORT-ROOT (a mobile transcription factor), they direct asymmetric cell divisions and patterning of cell types. The BIRDs and SCARECROW with SHORT-ROOT organize tissue patterns at all formative steps during growth, ensuring developmental plasticity.

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