EXPANSIN A1-mediated radial swelling of pericycle cells positions anticlinal cell divisions during lateral root initiation

Research output: Contribution to journalJournal articleResearchpeer-review

  • Priya Ramakrishna
  • Paola Ruiz Duarte
  • Graham A. Rance
  • Martin Schubert
  • Vera Vordermaier
  • Lam Dai Vu
  • Evan Murphy
  • Amaya Vilches Barro
  • Kamal Swarup
  • Kamaljit Moirangthem
  • Jørgensen, Bodil
  • Brigitte Van De Cotte
  • Tatsuaki Goh
  • Zhefeng Lin
  • Ute Voβ
  • Tom Beeckman
  • Malcolm J. Bennett
  • Kris Gevaert
  • Alexis Maizel
  • Ive De Smet

In plants, postembryonic formation of new organs helps shape the adult organism. This requires the tight regulation of when and where a new organ is formed and a coordination of the underlying cell divisions. To build a root system, new lateral roots are continuously developing, and this process requires the tight coordination of asymmetric cell division in adjacent pericycle cells. We identified EXPANSIN A1 (EXPA1) as a cell wall modifying enzyme controlling the divisions marking lateral root initiation. Loss of EXPA1 leads to defects in the first asymmetric pericycle cell divisions and the radial swelling of the pericycle during auxin-driven lateral root formation. We conclude that a localized radial expansion of adjacent pericycle cells is required to position the asymmetric cell divisions and generate a core of small daughter cells, which is a prerequisite for lateral root organogenesis.

Original languageEnglish
JournalProceedings of the National Academy of Sciences of the United States of America
Issue number17
Pages (from-to)8597-8602
Number of pages6
Publication statusPublished - 23 Apr 2019

    Research areas

  • Arabidopsis thaliana, Cell wall remodeling, EXPANSIN A1, Lateral root development, Radial cell expansion

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