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Spatial specificity of auxin responses coordinates wood formation

Author

Listed:
  • Klaus Brackmann

    (Vienna Biocenter (VBC))

  • Jiyan Qi

    (Heidelberg University)

  • Michael Gebert

    (Heidelberg University)

  • Virginie Jouannet

    (Heidelberg University)

  • Theresa Schlamp

    (Heidelberg University)

  • Karin Grünwald

    (Vienna Biocenter (VBC))

  • Eva-Sophie Wallner

    (Heidelberg University)

  • Daria D. Novikova

    (Novosibirsk State University
    Institute of Cytology and Genetics
    Wageningen University and Research Center)

  • Victor G. Levitsky

    (Novosibirsk State University
    Institute of Cytology and Genetics)

  • Javier Agustí

    (Vienna Biocenter (VBC)
    Universidad Politecnica de Valencia)

  • Pablo Sanchez

    (Vienna Biocenter (VBC))

  • Jan U. Lohmann

    (Heidelberg University)

  • Thomas Greb

    (Heidelberg University)

Abstract

Spatial organization of signalling events of the phytohormone auxin is fundamental for maintaining a dynamic transition from plant stem cells to differentiated descendants. The cambium, the stem cell niche mediating wood formation, fundamentally depends on auxin signalling but its exact role and spatial organization is obscure. Here we show that, while auxin signalling levels increase in differentiating cambium descendants, a moderate level of signalling in cambial stem cells is essential for cambium activity. We identify the auxin-dependent transcription factor ARF5/MONOPTEROS to cell-autonomously restrict the number of stem cells by directly attenuating the activity of the stem cell-promoting WOX4 gene. In contrast, ARF3 and ARF4 function as cambium activators in a redundant fashion from outside of WOX4-expressing cells. Our results reveal an influence of auxin signalling on distinct cambium features by specific signalling components and allow the conceptual integration of plant stem cell systems with distinct anatomies.

Suggested Citation

  • Klaus Brackmann & Jiyan Qi & Michael Gebert & Virginie Jouannet & Theresa Schlamp & Karin Grünwald & Eva-Sophie Wallner & Daria D. Novikova & Victor G. Levitsky & Javier Agustí & Pablo Sanchez & Jan U, 2018. "Spatial specificity of auxin responses coordinates wood formation," Nature Communications, Nature, vol. 9(1), pages 1-15, December.
    • Handle: RePEc:nat:natcom:v:9:y:2018:i:1:d:10.1038_s41467-018-03256-2
    DOI: 10.1038/s41467-018-03256-2
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