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Comparative genomics analyses reveal genomic variation and evolutionary adaptation in Dendrobium orchids
Bing-Jie Chen1, Jie-Yu Wang2, Shan-Ce Niu3
1GMU-GIBH Joint School of Life Sciences, The Guangdong-Hong Kong-Macao Joint Laboratory for Cell Fate Regulation and Diseases, Guangzhou Medical University, Guangzhou, Guangdong, China.
Nature Communications
|December 6, 2025
Summary
Genetic conservation in Dendrobium orchids aids environmental adaptability. Species diversity arises from geological and climatic shifts, with genes like CYP734A50 influencing self-incompatibility.
Area of Science:
- Genomics
- Evolutionary Biology
- Orchidaceae Research
Background:
- Mechanisms of species formation and diversity in Orchidaceae are poorly understood at the molecular level.
- Orchids, particularly the Dendrobium genus, present a complex case for evolutionary studies.
Purpose of the Study:
- To investigate the genetic basis of species formation and diversity in the Dendrobium genus using comparative genomics.
- To identify genetic factors contributing to environmental adaptability and evolutionary diversification in orchids.
Main Methods:
- Comparative genomic analysis of 24 chromosome-level genome assemblies.
- Genome skimming data from 204 Dendrobium species were utilized.
- Analysis focused on genetic variation, biosynthesis pathways, and adaptive evolution.
Main Results:
- Genetic conservation in Dendrobium is linked to environmental adaptability.
- Species diversity is driven by the Indian plate's compression and climatic changes (sea level, precipitation).
- CYP734A50 may be crucial for self-incompatibility (SI) in Dendrobium, with potential loss of the type-1 SI system.
Conclusions:
- Genomic insights into variation, biosynthesis, and adaptive evolution in Dendrobium were revealed.
- Provides fundamental understanding of genome-trait evolution in orchids.
- Contributes to broader knowledge of angiosperm diversification.
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