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Updated: Jun 10, 2025

Protocols for Obtaining Zygotic and Somatic Embryos for Studying the Regulation of Early Embryo Development in the Model Legume Medicago truncatula
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Dissecting the temporal genetic networks programming soybean embryo development from embryonic morphogenesis to

Yen-Ching Wang1,2, Wei-Hsun Hsieh1,2, Liang-Peng Lin1,2

  • 1Agricultural Biotechnology Research Center, Academia Sinica, Taipei, 115, Taiwan.

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Soybean embryo development involves distinct gene networks, with transcription factors (TFs) regulating desiccation tolerance and later development. Gene activities shift from transcriptional and chromatin regulation during storage to epigenetic mechanisms during germination.

Keywords:
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Area of Science:

  • Plant molecular biology
  • Developmental biology
  • Epigenetics

Background:

  • Seed development is a complex process involving precise gene regulation.
  • Understanding the transcriptomic landscape of seed development is crucial for crop improvement.
  • Soybean and Arabidopsis, while both model plants, exhibit differences in developmental pathways.

Purpose of the Study:

  • To profile the soybean embryo transcriptome from morphogenesis through post-germination.
  • To identify gene networks and regulatory mechanisms governing seed development.
  • To compare gene activities and regulatory functions between soybean and Arabidopsis.

Main Methods:

  • Comprehensive transcriptome profiling of soybean embryos across developmental stages.
  • Gene network analysis to identify stage-specific and conserved gene modules.
  • Functional assessment of key transcription factors (TFs) in Arabidopsis.

Main Results:

  • Transcriptomic landscapes revealed distinct early and late gene groups with shared and unique functions.
  • Upregulated genes during mid-embryogenesis were enriched in transcriptional and chromatin regulatory tasks.
  • Epigenetic functions, including histone modifications, dominated during germination.
  • A desiccation-associated gene module showed sequential TF activity, transitioning from stress response to development.
  • Significant divergence in gene networks for late embryogenesis was observed between soybean and Arabidopsis.

Conclusions:

  • Chromatin and transcriptional regulation coordinate during soybean seed development, with distinct epigenetic mechanisms driving germination.
  • Gene modules exhibit stage-specific functions or are required across multiple stages.
  • Soybean and Arabidopsis display divergent gene networks in late embryogenesis, highlighting species-specific developmental strategies.