SHORTROOT-Mediated Intercellular Signals Coordinate Phloem Development in Arabidopsis Roots

Show full item record



Permalink

http://hdl.handle.net/10138/328794

Citation

Kim , H , Zhou , J , Kumar , D , Jang , G , Hui Ryu , K , Sebastian , J , Miyashima , S , Helariutta , Y & Lee , J-Y 2020 , ' SHORTROOT-Mediated Intercellular Signals Coordinate Phloem Development in Arabidopsis Roots ' , Plant Cell , vol. 32 , no. 5 , pp. 1519-1535 . https://doi.org/10.1105/tpc.19.00455

Title: SHORTROOT-Mediated Intercellular Signals Coordinate Phloem Development in Arabidopsis Roots
Author: Kim, Hyoujin; Zhou, Jing; Kumar, Deepak; Jang, Geupil; Hui Ryu, Kook; Sebastian, Jose; Miyashima, Shunsuke; Helariutta, Yrjö; Lee, Ji-Young
Contributor: University of Helsinki, Institute of Biotechnology
University of Helsinki, Organismal and Evolutionary Biology Research Programme
Date: 2020-05-05
Language: eng
Belongs to series: Plant Cell
ISSN: 1040-4651
URI: http://hdl.handle.net/10138/328794
Abstract: Asymmetric cell division (ACD) and positional signals play critical roles in the tissue patterning process. In the Arabidopsis (Arabidopsis thaliana) root meristem, two major phloem cell types arise via ACDs of distinct origins: one for companion cells (CCs) and the other for proto- and metaphloem sieve elements (SEs). The molecular mechanisms underlying each of these processes have been reported; however, how these are coordinated has remained elusive. Here, we report a new phloem development process coordinated via the SHORTROOT (SHR) transcription factor in Arabidopsis. The movement of SHR into the endodermis regulates the ACD for CC formation by activating microRNA165/6, while SHR moving into the phloem regulates the ACD generating the two phloem SEs. In the phloem, SHR sequentially activates NAC-REGULATED SEED MORPHOLOGY 1 (NARS1) and SECONDARY WALL-ASSOCIATED NAC DOMAIN PROTEIN 2 (SND2), and these three together form a positive feedforward loop. Under this regulatory scheme, NARS1, generated in the CCs of the root differentiation zone, establishes a top-down signal that drives the ACD for phloem SEs in the meristem. SND2 appears to function downstream to amplify NARS1 via positive feedback. This new regulatory mechanism expands our understanding of the sophisticated vascular tissue patterning processes occurring during postembryonic root development.
Subject: 11831 Plant biology
1182 Biochemistry, cell and molecular biology
Rights:


Files in this item

Total number of downloads: Loading...

Files Size Format View
plcell_v32_5_1519.pdf 4.533Mb PDF View/Open

This item appears in the following Collection(s)

Show full item record