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Related Experiment Video

Updated: Jan 3, 2026

Poplar Adventitious Roots Induced by Stem Canker Pathogens: An Experimental System for Studying Roots Biology and Light Response-Related Processes
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GABA negatively regulates adventitious root development in poplar.

Tiantian Xie1, Jing Ji1, Wei Chen1

  • 1State Key Laboratory of Tree Genetics and Breeding, Key Laboratory of Tree Breeding and Cultivation of State Forestry and Grassland Administration, Research Institute of Forestry Research, Chinese Academy of Forestry, Beijing, China.

Journal of Experimental Botany
|November 20, 2019
PubMed
Summary
This summary is machine-generated.

γ-Aminobutyric acid (GABA) accumulation inhibits adventitious root formation in poplar plants. This study reveals GABA

Keywords:
Adventitious rootadventitious root primordiacarbon and nitrogen metabolismhormonepoplarγ-aminobutyric acid

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Area of Science:

  • Plant Biology
  • Plant Physiology
  • Molecular Biology

Background:

  • γ-Aminobutyric acid (GABA) is a key metabolite known to influence plant growth.
  • The specific role of GABA in adventitious root (AR) development remains largely unexplored.

Purpose of the Study:

  • To investigate the regulatory effects of GABA on adventitious root (AR) development in poplar.
  • To elucidate the underlying molecular and metabolic mechanisms by which GABA influences AR formation.

Main Methods:

  • Utilized poplar lines overexpressing glutamate decarboxilase 2 (GAD2).
  • Treated poplar stem cuttings with exogenous GABA or vigabatrin (VGB), a GABA transaminase inhibitor.
  • Conducted anatomical observations, primary metabolism analysis, gene expression profiling, and hormone level measurements.

Main Results:

  • Endogenous GABA accumulation and exogenous GABA/VGB treatments inhibited AR growth and delayed AR formation by approximately 1 day.
  • Observed transient increases in hexose and amino acid levels during the delay period.
  • Identified decreased ethylene signaling and increased auxin, abscisic acid, and GA4 levels during AR formation.

Conclusions:

  • GABA plays a critical role in regulating adventitious root development in poplar.
  • GABA interacts with hormone signaling pathways (ethylene, auxin, ABA, GA4) and influences carbon/nitrogen metabolism during AR formation.