ELIMAKI Locus Is Required for Vertical Proprioceptive Response in Birch Trees

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Alonso Serra , J A , Shi , X , Peaucelle , A , Rastas , P , Bourdon , M , Immanen , J , Takahashi , J , Koivula , H , Eswaran , G , Muranen , S J , Help-Rinta-Rahko , H , Smolander , O-P , Su , C , Safronov , O , Gerber , L , Salojärvi , J , Hagqvist , R , Mähönen , A P , Helariutta , Y & Nieminen , K 2020 , ' ELIMAKI Locus Is Required for Vertical Proprioceptive Response in Birch Trees ' , Current Biology , vol. 30 , no. 4 , pp. 589-599 . https://doi.org/10.1016/j.cub.2019.12.016

Title: ELIMAKI Locus Is Required for Vertical Proprioceptive Response in Birch Trees
Author: Alonso Serra, Juan Antonio; Shi, Xueping; Peaucelle, Alexis; Rastas, Pasi; Bourdon, Matthieu; Immanen, Juha; Takahashi, Junko; Koivula, Hanna; Eswaran, Gugan; Muranen, Sampo Johannes; Help-Rinta-Rahko, Hanna; Smolander, Olli-Pekka; Su, Chang; Safronov, Omid; Gerber, Lorenz; Salojärvi, Jarkko; Hagqvist, Risto; Mähönen, Ari Pekka; Helariutta, Yrjö; Nieminen, Kaisa
Contributor organization: Institute of Biotechnology
Organismal and Evolutionary Biology Research Programme
Food Sciences
Department of Food and Nutrition
Helsinki Institute of Life Science HiLIFE
Materials Physics
Molecular and Integrative Biosciences Research Programme
Plant-Fungal Interactions Group
Bioinformatics for Molecular Biology and Genomics (BMBG)
Viikki Plant Science Centre (ViPS)
Ari Pekka Mähönen / Principal Investigator
Plant Biology
Yrjö Helariutta / Principal Investigator
Date: 2020-02-24
Language: eng
Number of pages: 16
Belongs to series: Current Biology
ISSN: 0960-9822
DOI: https://doi.org/10.1016/j.cub.2019.12.016
URI: http://hdl.handle.net/10138/325516
Abstract: Tree architecture has evolved to support a top-heavy above-ground biomass, but this integral feature poses a weight-induced challenge to trunk stability. Maintaining an upright stem is expected to require vertical proprioception through feedback between sensing stem weight and responding with radial growth. Despite its apparent importance, the principle by which plant stems respond to vertical loading forces remains largely unknown. Here, by manipulating the stem weight of downy birch (Betula pubescens) trees, we show that cambial development is modulated systemically along the stem. We carried out a genetic study on the underlying regulation by combining an accelerated birch flowering program with a recessive mutation at the ELIMAKI locus (EKI), which causes a mechanically defective response to weight stimulus resulting in stem collapse after just 3 months. We observed delayed wood morphogenesis in eki compared with WT, along with a more mechanically elastic cambial zone and radial compression of xylem cell size, indicating that rapid tissue differentiation is critical for cambial growth under mechanical stress. Furthermore, the touch-induced mechanosensory pathway was transcriptionally misregulated in eki, indicating that the ELIMAKI locus is required to integrate the weight-growth feedback regulation. By studying this birch mutant, we were able to dissect vertical proprioception from the gravitropic response associated with reaction wood formation. Our study provides evidence for both local and systemic responses to mechanical stimuli during secondary plant development.
Subject: 119 Other natural sciences
1184 Genetics, developmental biology, physiology
Peer reviewed: Yes
Usage restriction: openAccess
Self-archived version: acceptedVersion

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