Root gravity response module guides differential growth determining both root bending and apical hook formation in Arabidopsis

Q. Zhu, M. Gallemi, J. Pospíšil, P. Žádníková, M. Strnad, E. Benková, Development 146 (2019).


Journal Article | Published | English

Scopus indexed
Author
Zhu, QiangIST Austria; Gallemi Rovira, MarcalIST Austria; Pospíšil, Jiří; Žádníková, Petra; Strnad, Miroslav; Benková, EvaIST Austria
Department
Abstract
The apical hook is a transiently formed structure that plays a protective role when the germinating seedling penetrates through the soil towards the surface. Crucial for proper bending is the local auxin maxima, which defines the concave (inner) side of the hook curvature. As no sign of asymmetric auxin distribution has been reported in embryonic hypocotyls prior to hook formation, the question of how auxin asymmetry is established in the early phases of seedling germination remains largely unanswered. Here, we analyzed the auxin distribution and expression of PIN auxin efflux carriers from early phases of germination, and show that bending of the root in response to gravity is the crucial initial cue that governs the hypocotyl bending required for apical hook formation. Importantly, polar auxin transport machinery is established gradually after germination starts as a result of tight root-hypocotyl interaction and a proper balance between abscisic acid and gibberellins.
Publishing Year
Date Published
2019-09-12
Journal Title
Development
Acknowledgement
We thank Jiri Friml and Phillip Brewer for inspiring discussion and for help in preparing the manuscript. This research was supported by the Scientific Service Units (SSU) of IST-Austria through resources provided by the Bioimaging Facility (BIF), the Life Science Facility (LSF). This work was supported by grants from the European Research Council (Starting Independent Research Grant ERC-2007-Stg- 207362-HCPO to E.B.). J.P. and M.S. received funds from European Regional Development Fund-Project ‘Centre for Experimental Plant Biology’ (No. CZ.02.1.01/0.0/0.0/16_019/0000738).
Volume
146
Issue
17
Article Number
dev175919
eISSN
IST-REx-ID

Cite this

Zhu Q, Gallemi M, Pospíšil J, Žádníková P, Strnad M, Benková E. Root gravity response module guides differential growth determining both root bending and apical hook formation in Arabidopsis. Development. 2019;146(17). doi:10.1242/dev.175919
Zhu, Q., Gallemi, M., Pospíšil, J., Žádníková, P., Strnad, M., & Benková, E. (2019). Root gravity response module guides differential growth determining both root bending and apical hook formation in Arabidopsis. Development. The Company of Biologists. https://doi.org/10.1242/dev.175919
Zhu, Qiang, Marçal Gallemi, Jiří Pospíšil, Petra Žádníková, Miroslav Strnad, and Eva Benková. “Root Gravity Response Module Guides Differential Growth Determining Both Root Bending and Apical Hook Formation in Arabidopsis.” Development. The Company of Biologists, 2019. https://doi.org/10.1242/dev.175919.
Q. Zhu, M. Gallemi, J. Pospíšil, P. Žádníková, M. Strnad, and E. Benková, “Root gravity response module guides differential growth determining both root bending and apical hook formation in Arabidopsis,” Development, vol. 146, no. 17. The Company of Biologists, 2019.
Zhu Q, Gallemi M, Pospíšil J, Žádníková P, Strnad M, Benková E. 2019. Root gravity response module guides differential growth determining both root bending and apical hook formation in Arabidopsis. Development. 146(17), dev175919.
Zhu, Qiang, et al. “Root Gravity Response Module Guides Differential Growth Determining Both Root Bending and Apical Hook Formation in Arabidopsis.” Development, vol. 146, no. 17, dev175919, The Company of Biologists, 2019, doi:10.1242/dev.175919.
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