MYB12 is part of a feedback loop regulating cell division orientation in the root meristem vasculature

Brecht Wybouw, Helena E Arents, Baojun Yang, Jonah Nolf, Wouter Smet, Michael Vandorpe, Max Minne, Xiaopeng Luo, Inge De Clercq, Daniël Van Damme, Matouš Glanc, Bert De Rybel

Research output: Contribution to journalArticlepeer-review

5 Scopus citations


Transcriptional networks are crucial to integrate various internal and external signals into optimal responses during plant growth and development. Primary root vasculature patterning and proliferation are controlled by a network centred around the basic Helix-Loop-Helix transcription factor complex formed by TARGET OF MONOPTEROS 5 (TMO5) and LONESOME HIGHWAY (LHW), which control cell proliferation and division orientation by modulating cytokinin response and other downstream factors. Despite recent progress, many aspects of the TMO5/LHW pathway are not fully understood. In particular, the upstream regulators of TMO5/LHW activity remain unknown. Here, using a forward genetic approach to identify new factors of the TMO5/LHW pathway, we discovered a novel function of the MYB-type transcription factor MYB12. MYB12 physically interacts with TMO5 and dampens the TMO5/LHW-mediated induction of direct target gene expression as well as the periclinal/radial cell divisions. The expression of MYB12 is activated by the cytokinin response, downstream of TMO5/LHW, resulting in a novel MYB12-mediated negative feedback loop that restricts TMO5/LHW activity to ensure optimal cell proliferation rates during root vascular development.
Original languageEnglish (US)
JournalJournal of Experimental Botany
StatePublished - Jan 18 2023

ASJC Scopus subject areas

  • Plant Science
  • Physiology


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