Transcriptome Profiling Revealed Light-Mediated Gene Expression Patterns of Plants in Forest Vertical Structures
Qiming Mei1,2,3,4, Yi Zheng1,2,3, Jiayi Feng1,2,3
1Key Laboratory of Vegetation Restoration and Management of Degraded Ecosystems, South China Botanical Garden, Chinese Academy of Sciences, Guangzhou 510650, China.
Biology
|April 26, 2025
Summary
Forest understory plants adapt to shade by altering gene expression. Shade-tolerant species show higher photoreceptor and photoprotection gene levels, influencing forest structure.
Area of Science:
- Plant Ecology
- Molecular Ecology
- Forest Science
Background:
- Light availability is a key factor structuring forest communities, with canopy cover creating shaded understory environments.
- Light intensity and spectral quality change vertically through forest ecosystems, impacting plant survival and growth.
- Understanding plant responses to light heterogeneity is crucial for community ecology and forest management.
Purpose of the Study:
- To investigate light-mediated gene expression patterns in forest vertical structures.
- To identify how variable light environments influence gene expression related to photosynthesis, light reception, and photoprotection in plants.
- To correlate gene expression profiles with plant shade tolerance and forest vertical structure.
Main Methods:
- Utilized transcriptome profiling to analyze gene expression in plants across different forest vertical strata.
- Quantified expression levels of 20 annotated genes involved in photosynthesis, photoreception, and photoprotection.
- Correlated gene expression traits with known shade tolerance of plant species.
Main Results:
- Shade-tolerant species exhibited higher expression of photoreceptor (phot1/2, phyA/B), photorespiration (pglp1/2), and photoprotection genes (Lhca5, Lhca7, PsbS, photolyases).
- Shade-tolerant species showed lower abundance of photosynthetic light-harvesting genes (Lhca1/2, Lhcb1/2).
- Light-harvesting and photoprotection genes were upregulated by high light, while photoreceptor genes were upregulated by shade.
Conclusions:
- Differential gene expression in response to light availability is a key mechanism shaping forest vertical structure.
- Plant species possess distinct genetic strategies for coping with light variability, influencing community composition.
- This study provides insights into the molecular basis of plant adaptation to forest light regimes.
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