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Updated: Jan 25, 2026
08:15
Metabolomic Analysis of Barley by Gas Chromatography/Mass Spectrometry
Published on: November 8, 2024
922
APETALA2 control of barley internode elongation
Vrushali Patil1, Hannah I McDermott1, Trisha McAllister1
1Division of Plant Sciences, School of Life Sciences, The University of Dundee at The James Hutton Institute, Invergowrie, Dundee DD2 5DA, Scotland.
Development (Cambridge, England)
|May 12, 2019
Summary
MicroRNA (miRNA) regulation of APETALA2 (AP2) is crucial for stem elongation in barley during flowering. This study reveals how miR172 controls AP2 to coordinate plant growth with reproduction.
Area of Science:
- Plant Biology
- Molecular Genetics
- Developmental Biology
Background:
- Stem elongation during flowering is a critical developmental process in plants.
- The precise molecular mechanisms coordinating stem growth with reproductive development remain largely unknown.
Purpose of the Study:
- To investigate the role of microRNA (miRNA) in regulating stem internode elongation in barley, particularly the peduncle.
- To elucidate the molecular interplay between miRNA, APETALA2 (AP2) gene, and hormonal pathways in controlling plant architecture during flowering.
Main Methods:
- Utilized the barley mutant 'Zeo1.b' with disrupted miR172 targeting of AP2.
- Performed stage- and tissue-specific comparative transcriptomics.
- Applied methyl jasmonate (MeJA) and gibberellin to assess hormonal effects on stem growth.
Main Results:
- The 'Zeo1.b' mutant exhibited reduced mitotic activity, delayed growth, and premature lignification in the peduncle, resulting in shorter cells.
- Transcriptomic analysis revealed altered expression of proliferation, maturation, jasmonate, and stress response genes in the mutant.
- Methyl jasmonate application mimicked the mutant phenotype, while the mutant showed altered sensitivity to MeJA and gibberellin.
Conclusions:
- miR172-mediated regulation of AP2 is essential for proper stem elongation, especially the peduncle, in flowering barley.
- The miR172-AP2 pathway likely modulates the jasmonate pathway to facilitate gibberellin-driven stem growth during reproduction.
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