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Temperature signals drive grass secondary cell wall thickening
Biorxiv : the Preprint Server for Biology
|April 16, 2025
Summary
Grass stem development relies on cellulose synthesis, regulated by CELLULOSE SYNTHASE A (CESA8) gene expression. This study reveals CESA8 expression follows a daily rhythm driven by temperature, impacting stem elongation and secondary wall thickening for improved crop resilience.
Area of Science:
- Plant Biology
- Molecular Genetics
- Biochemistry
Background:
- Stem elongation in grasses is driven by intercalary meristems, involving cell division, elongation, and secondary wall maturation.
- Cellulose, synthesized by CELLULOSE SYNTHASE A (CESA) proteins, is crucial for plant cell walls and structural integrity.
Purpose of the Study:
- To investigate the spatiotemporal regulation of cellulose deposition during grass stem development.
- To understand the role of CESA8 gene expression in secondary wall formation and its environmental regulation.
Main Methods:
- Development of a CESA8 luciferase gene expression reporter system in Brachypodium distachyon.
- Utilized time-lapse imaging, histological analysis, biophysical measurements, and transcript analysis.
- Conducted temperature pulse experiments to assess CESA8 response to thermal cues.
Main Results:
- High bioluminescence indicating active secondary wall deposition was observed in stem nodes and specific internode regions.
- CESA8 expression exhibited a distinct diurnal rhythm governed by thermocycles, peaking in the early morning.
- Luminescence intensity correlated with thickened secondary cell walls, increased cellulose crystallinity, and elevated CESA8 transcript levels.
Conclusions:
- Secondary wall thickening in grass stems follows a temperature-regulated daily rhythm, distinct from light cycles.
- CESA8 expression is tightly linked to stem elongation and secondary cell wall thickening.
- Findings offer insights for optimizing plant architecture in bioenergy crops for enhanced biomass production and resilience.
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