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Updated: Jul 7, 2025
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Lateral Root Inducible System in Arabidopsis and Maize
Published on: January 14, 2016
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Root branching under high salinity requires auxin-independent modulation of LATERAL ORGAN BOUNDARY DOMAIN 16 function
Yanxia Zhang1,2,3, Yiyun Li1, Thijs de Zeeuw1
1Laboratory of Plant Physiology, Wageningen University & Research, 6708 PB Wageningen, The Netherlands.
The Plant Cell
|December 23, 2023
Summary
Salt stress hinders lateral root (LR) growth by repressing auxin signaling. However, an alternative pathway activates ZINC FINGER OF ARABIDOPSIS THALIANA 6 (ZAT6), which promotes LR development under saline conditions.
Area of Science:
- Plant Biology
- Molecular Biology
- Stress Physiology
Background:
- Salinity stress significantly inhibits plant growth by constraining lateral root (LR) development.
- Auxin signaling is crucial for LR formation, but the precise molecular mechanisms by which salinity impacts root auxin signaling remain unclear.
- The LATERAL ORGAN BOUNDARY DOMAIN 16 (LBD16) transcription factor is vital for LR development under normal conditions.
Purpose of the Study:
- To elucidate the molecular mechanisms by which salinity affects root auxin signaling and LR development in Arabidopsis thaliana.
- To identify alternative pathways regulating LBD16 expression under high-salt conditions.
- To understand how salt-activated pathways integrate with auxin signaling to modulate root branching.
Main Methods:
- Investigated gene expression patterns under high-salt conditions.
- Utilized molecular genetics techniques to study the roles of ZINC FINGER OF ARABIDOPSIS THALIANA 6 (ZAT6) and LBD16.
- Analyzed downstream effects on cell wall remodeling and LR development.
Main Results:
- High-salt conditions repress auxin signaling pathways that normally regulate LR development.
- In parallel, salinity activates ZAT6, a transcriptional activator of LBD16, via an auxin-independent pathway.
- ZAT6-mediated activation of LBD16 promotes cell wall remodeling and contributes to LR development under salt stress.
Conclusions:
- Root development under high-salt conditions is modulated by the integration of both auxin-dependent repressive pathways and salt-activated, auxin-independent pathways converging on LBD16.
- This study reveals a novel mechanism for salinity tolerance involving ZAT6-mediated activation of LBD16, promoting LR growth despite auxin signaling repression.
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