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Related Experiment Video

Updated: Sep 15, 2025

Measuring Gene Expression in Bombarded Barley Aleurone Layers with Increased Throughput

Measuring Gene Expression in Bombarded Barley Aleurone Layers with Increased Throughput

Published on: March 30, 2018

Regulatory Programmes Driving Suberin Plasticity Under Aluminium Stress in Barley Roots.

Hongjun Meng¹, Qihui Zhang¹, Tino Kreszies²

¹Department of Ecophysiology, Institute of Cellular and Molecular Botany, University of Bonn, Bonn, Germany.

Plant, Cell & Environment

|July 17, 2025

Summary

Silicon (Si) mitigates aluminium (Al) toxicity in barley by reducing Al-induced suberin deposition in roots. Abscisic acid (ABA) regulates this Al response, highlighting suberin

Keywords:

ABA LCM RNA‐seq aluminium (Al) stress apoplast barley root silicon suberin

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Area of Science:

Plant Biology
Soil Science
Biochemistry

Background:

Aluminium (Al) toxicity severely limits plant growth in acidic soils.
Silicon (Si) can mitigate Al effects, but its impact on root suberin barriers is unclear.
The role of suberin in Al stress response requires further investigation.

Purpose of the Study:

To investigate the effects of Al and Si on suberin development in barley roots.
To elucidate the molecular mechanisms regulating Al-induced suberin biosynthesis.
To assess the role of suberin in Al uptake and plant tolerance.

Main Methods:

Physiological, histochemical, and analytical assessments.
Laser capture microdissection (LCM) RNA-sequencing of barley root tissues.
Application of fluridone (ABA synthesis inhibitor) and analysis of suberin mutants.

Main Results:

Al exposure increased suberin deposition in barley roots, particularly the endodermis.
Silicon (Si) addition reversed Al-induced suberin deposition.
Gene expression analysis revealed the abscisic acid (ABA) pathway regulates Al-induced suberin biosynthesis.
ABA plays a pivotal role in the Al response, and suberin influences Al uptake.

Conclusions:

Aluminium stress significantly impacts suberin biosynthesis in barley roots.
Silicon mitigates Al toxicity by modulating ABA-dependent suberin deposition.
Understanding suberin's role offers strategies for improving crop resilience to Al toxicity.