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

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. Lohmann, Klaus Harter and Thomas Greb ()
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Eva-Sophie Wallner: Heidelberg University
Nina Tonn: Heidelberg University
Dongbo Shi: Heidelberg University
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
Michael Gebert: Heidelberg University
Christian Wenzl: Heidelberg University
Jan U. Lohmann: Heidelberg University
Klaus Harter: University of Tübingen
Thomas Greb: Heidelberg University

Nature Communications, 2023, vol. 14, issue 1, 1-16

Abstract: 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.

Date: 2023
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DOI: 10.1038/s41467-023-37790-5

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