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SCARECROW-LIKE23 and SCARECROW jointly specify endodermal cell fate but distinctly control SHORT-ROOT movement

Long, Yuchen, Goedhart, Joachim, Schneijderberg, Martinus, Terpstra, Inez, Shimotohno, Akie, Bouchet, Benjamin P., Akhmanova, Anna, Gadella, Theodorus W. J., Heidstra, Renze, Scheres, Ben and Blilou, Ikram 2015. SCARECROW-LIKE23 and SCARECROW jointly specify endodermal cell fate but distinctly control SHORT-ROOT movement. The Plant Journal 84 (4) , pp. 773-784. 10.1111/tpj.13038

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Intercellular signaling through trafficking of regulatory proteins is a widespread phenomenon in plants and can deliver positional information for the determination of cell fate. In the Arabidopsis root meristem, the cell fate determinant SHORT‐ROOT (SHR), a GRAS domain transcription factor, acts as a signaling molecule from the stele to the adjacent layer to specify endodermal cell fate. Upon exiting the stele, SHR activates another GRAS domain transcription factor, SCARCROW (SCR), which, together with several BIRD/INDETERMINATE DOMAIN proteins, restricts movement of SHR to define a single cell layer of endodermis. Here we report that endodermal cell fate also requires the joint activity of both SCR and its closest homologue SCARECROW‐LIKE23 (SCL23). We show that SCL23 protein moves with zonation‐dependent directionality. Within the meristem, SCL23 exhibits short‐ranged movement from ground tissue to vasculature. Away from the meristem, SCL23 displays long‐range rootward movement into meristematic vasculature and a bidirectional radial spread, respectively. As a known target of SHR and SCR, SCL23 also interacts with SCR and SHR and can restrict intercellular outspread of SHR without relying on nuclear retention as SCR does. Collectively, our data show that SCL23 is a mobile protein that controls movement of SHR and acts redundantly with SCR to specify endodermal fate in the root meristem.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Biosciences
Publisher: Wiley-Blackwell
ISSN: 0960-7412
Date of First Compliant Deposit: 6 December 2018
Date of Acceptance: 15 September 2015
Last Modified: 14 Dec 2018 14:25

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