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OBERON3 and SUPPRESSOR OF MAX2 1-LIKE proteins form a regulatory module driving phloem development

Author

Listed:
  • Eva-Sophie Wallner

    (Heidelberg University
    Stanford University)

  • Nina Tonn

    (Heidelberg University)

  • Dongbo Shi

    (Heidelberg University
    Japan RIKEN Center for Sustainable Resource Science (CSRS)
    University of Potsdam
    Japan Science and Technology Agency (JST), Saitama)

  • Laura Luzzietti

    (Heidelberg University)

  • Friederike Wanke

    (University of Tübingen)

  • Pascal Hunziker

    (Heidelberg University)

  • Yingqiang Xu

    (Heidelberg University)

  • Ilona Jung

    (Heidelberg University)

  • Vadir Lopéz-Salmerón

    (Heidelberg University
    BD Bioscience)

  • Michael Gebert

    (Heidelberg University)

  • Christian Wenzl

    (Heidelberg University)

  • Jan U. Lohmann

    (Heidelberg University)

  • Klaus Harter

    (University of Tübingen)

  • Thomas Greb

    (Heidelberg University)

Abstract

Spatial specificity of cell fate decisions is central for organismal development. The phloem tissue mediates long-distance transport of energy metabolites along plant bodies and is characterized by an exceptional degree of cellular specialization. How a phloem-specific developmental program is implemented is, however, unknown. Here we reveal that the ubiquitously expressed PHD-finger protein OBE3 forms a central module with the phloem-specific SMXL5 protein for establishing the phloem developmental program in Arabidopsis thaliana. By protein interaction studies and phloem-specific ATAC-seq analyses, we show that OBE3 and SMXL5 proteins form a complex in nuclei of phloem stem cells where they promote a phloem-specific chromatin profile. This profile allows expression of OPS, BRX, BAM3, and CVP2 genes acting as mediators of phloem differentiation. Our findings demonstrate that OBE3/SMXL5 protein complexes establish nuclear features essential for determining phloem cell fate and highlight how a combination of ubiquitous and local regulators generate specificity of developmental decisions in plants.

Suggested Citation

  • Eva-Sophie Wallner & Nina Tonn & Dongbo Shi & Laura Luzzietti & Friederike Wanke & Pascal Hunziker & Yingqiang Xu & Ilona Jung & Vadir Lopéz-Salmerón & Michael Gebert & Christian Wenzl & Jan U. Lohman, 2023. "OBERON3 and SUPPRESSOR OF MAX2 1-LIKE proteins form a regulatory module driving phloem development," Nature Communications, Nature, vol. 14(1), pages 1-16, December.
    • Handle: RePEc:nat:natcom:v:14:y:2023:i:1:d:10.1038_s41467-023-37790-5
    DOI: 10.1038/s41467-023-37790-5
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