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The development of all multicellular organisms starts with the fusion of haploid cells called sperm and egg to form a diploid zygote. A zygote is a totipotent cell that can develop into a complete organism. The zygote undergoes cell division or cleavage to form an 8-cell mass. Until this stage, the cells are spherical, loosely attached, and remain totipotent. Totipotent cells are capable of developing both the embryonic and the extraembryonic tissues. However, as they continue to divide, they...
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Nuclear reprogramming is a process of transforming one cell type into an unrelated cell type by epigenetic changes that alter the cell’s original gene expression pattern. Such epigenetic changes force cells to express a different set of genes, which play a significant role in inducing transformation into other cell types. Nuclear reprogramming offers applications in reproductive cloning for livestock propagation and regenerative medicine — developing patient-specific cells for...
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Updated: Sep 1, 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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Overview of Somatic Embryogenesis.

Marco A Ramírez-Mosqueda1

  • 1Facultad de Ciencias Biológicas y Agropecuarias, Universidad Veracruzana, Amatlán de los Reyes, Veracruz, Mexico. marcoramirez02@uv.mx.

Methods in Molecular Biology (Clifton, N.J.)
|August 11, 2022
PubMed
Summary

Somatic embryogenesis offers efficient plant multiplication by harnessing cellular totipotency. This process involves dedifferentiation and redifferentiation to produce somatic embryos, with direct and indirect pathways identified for various plant species.

Keywords:
ConversionDevelopmental PathwayEmbryo TypeMorphogenic DevelopmentSomaclonal Variation

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Area of Science:

  • Plant Biotechnology
  • Developmental Biology
  • Agricultural Science

Background:

  • Somatic embryogenesis is a key process for plant propagation, utilizing cellular totipotency.
  • It involves dedifferentiation of somatic cells followed by redifferentiation into embryos.
  • Understanding the factors influencing this morphogenic capacity is crucial for efficient plant multiplication.

Purpose of the Study:

  • To provide updated information on techniques, protocols, and tools for somatic embryogenesis.
  • To detail the direct and indirect somatic embryogenesis pathways in plants.
  • To facilitate the economic application of somatic embryogenesis across diverse plant species.

Main Methods:

  • Induction of dedifferentiation and proliferation of somatic cells.
  • Application of plant growth regulators for differentiation.
  • Optimization of incubation conditions and culture medium supplementation.

Main Results:

  • Identification of two distinct pathways: direct and indirect somatic embryogenesis.
  • Direct somatic embryogenesis bypasses callus formation.
  • Indirect somatic embryogenesis involves a callus intermediate stage.

Conclusions:

  • Somatic embryogenesis is a highly efficient method for plant multiplication.
  • The choice of pathway (direct vs. indirect) depends on the plant species and protocols.
  • This book serves as a comprehensive guide for researchers and practitioners in plant somatic embryogenesis.