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A Reservoir of Pluripotent Phloem Cells Safeguards the Linear Developmental Trajectory of Protophloem Sieve Elements

38 Pages Posted: 9 Sep 2019 Sneak Peek Status: Review Complete

See all articles by Bojan Gujas

Bojan Gujas

ETH Zürich - Group of Plant Vascular Development

Elizabeth Kastanaki

ETH Zürich - Group of Plant Vascular Development

Alessandra Sturchler

ETH Zürich - Group of Plant Vascular Development

Maria Aguila Ruiz-Sola

ETH Zürich

Rene Dreos

University of Lausanne

Simona Eicke

ETH Zürich

Elisabeth Truernit

ETH Zürich

Antia Rodriguez-Villalon

ETH Zürich - Group of Plant Vascular Development

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Abstract

Plant cells can change their identity based on positional information, a mechanism that confers developmental plasticity to plants. This ability, common to distinct multicellular organisms, is particularly relevant for plant phloem cells. Protophloem sieve elements (PSEs), one type of phloem conductive cells, act as the main organizers of the phloem pole, which comprises four distinct cell types organized in a conserved pattern. Here, we report how Arabidopsis roots generate a reservoir of uncommitted phloem cells competent to swap their cell identities. While PSE misspecification induces cell identity hybridism, the activity of RECEPTOR LIKE PROTEIN KINASE 2 (RPK2) by perceiving CLE45 peptide contributes to restrict PSE identity to the PSE position. By maintaining a spatio-temporal window when PSE and PSE-adjacent cells’ identities are interchangeable, CLE45 signaling endows phloem cells with the competence to re-pattern a functional phloem pole when protophloem fails to form.

Keywords: cell identity, phloem, companion cell, plastic developmental trajectory, RPK2, CLE peptides

Suggested Citation

Gujas, Bojan and Kastanaki, Elizabeth and Sturchler, Alessandra and Ruiz-Sola, Maria Aguila and Dreos, Rene and Eicke, Simona and Truernit, Elisabeth and Rodriguez-Villalon, Antia, A Reservoir of Pluripotent Phloem Cells Safeguards the Linear Developmental Trajectory of Protophloem Sieve Elements (September 6, 2019). CURRENT-BIOLOGY-D-19-01466. Available at SSRN: https://ssrn.com/abstract=3449274 or http://dx.doi.org/10.2139/ssrn.3449274
This is a paper under consideration at Cell Press and has not been peer-reviewed.

Bojan Gujas

ETH Zürich - Group of Plant Vascular Development ( email )

Switzerland

Elizabeth Kastanaki

ETH Zürich - Group of Plant Vascular Development ( email )

Switzerland

Alessandra Sturchler

ETH Zürich - Group of Plant Vascular Development ( email )

Switzerland

Maria Aguila Ruiz-Sola

ETH Zürich ( email )

Zürichbergstrasse 18
8092 Zurich, CH-1015
Switzerland

Rene Dreos

University of Lausanne

Quartier Chambronne
Lausanne, CH-1015
Switzerland

Simona Eicke

ETH Zürich ( email )

Zürichbergstrasse 18
8092 Zurich, CH-1015
Switzerland

Elisabeth Truernit

ETH Zürich ( email )

Zürichbergstrasse 18
8092 Zurich, CH-1015
Switzerland

Antia Rodriguez-Villalon (Contact Author)

ETH Zürich - Group of Plant Vascular Development ( email )

Switzerland

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