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Zygotic Development And Stem Cell Formation01:10

Zygotic Development And Stem Cell Formation

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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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Gastrulation establishes the three primary tissues of an embryo: the ectoderm, mesoderm, and endoderm. This developmental process relies on a series of intricate cellular movements, which in humans transforms a flat, “bilaminar disc” composed of two cell sheets into a three-tiered structure. In the resulting embryo, the endoderm serves as the bottom layer, and stacked directly above it is the intermediate mesoderm, and then the uppermost ectoderm. Respectively, these tissue strata...
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After a large-single-celled zygote is produced via fertilization, the process of cleavage occurs while zygotes travel through the uterine tube. Cleavage is a mitotic cell division that does not result in growth. With each round of successive cell division, daughter cells get increasingly smaller.
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Determination01:51

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During embryogenesis, cells become progressively committed to different fates through a two-step process: specification followed by determination. Specification is demonstrated by removing a segment of an early embryo, “neutrally” culturing the tissue in vitro—for example, in a petri dish with simple medium—and then observing the derivatives. If the cultured region gives rise to cell types that it would normally generate in the embryo, this means that it is specified. In...
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Morphogenesis02:19

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Plant morphogenesis—the development of a plant’s form and structure—involves several overlapping developmental processes, including growth and cell differentiation. Precursor cells differentiate into specific cell types, which are organized into the tissues and organ systems that make up the functional plant.
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Cellular Differentiation00:57

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How does a complex organism such as a human develop from a single cell? It all starts from a single fertilized egg which gives rise to a vast array of cell types, such as nerve cells, muscle cells, and epithelial cells that characterize the adult? Throughout development and adulthood, cellular differentiation leads cells to assume their final morphology and physiology. Differentiation is the process by which unspecialized cells become specialized to carry out distinct functions.
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A Method for Characterizing Embryogenesis in Arabidopsis
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Somatic embryogenesis: life and death processes during apical-basal patterning.

Andrei Smertenko1, Peter V Bozhkov

  • 1Institute of Biological Chemistry, Washington State University, Pullman, WA 99164-6340, USA.

Journal of Experimental Botany
|March 14, 2014
PubMed
Summary
This summary is machine-generated.

Somatic embryogenesis (SE) uses cell differentiation to create plants without gamete fusion. This biotechnology tool aids plant propagation and genetic modification by studying embryo patterning and programmed cell death (PCD).

Keywords:
Cell deathcell fatedifferentiationembryo suspensorproliferationsomatic embryogenesis.

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Area of Science:

  • Plant biotechnology
  • Developmental biology
  • Cellular and molecular biology

Background:

  • Somatic embryogenesis (SE) bypasses gamete fusion for plant propagation.
  • SE is crucial for species with long reproductive cycles or low seed set.
  • SE serves as a model for studying plant embryo patterning and genetic modification.

Purpose of the Study:

  • To provide an overview of signaling pathways in somatic embryogenesis.
  • To highlight the role of programmed cell death (PCD) in SE development.
  • To explore the shared molecular mechanisms between apical and basal domains in SE.

Main Methods:

  • Review of existing literature on somatic embryogenesis.
  • Analysis of molecular and cellular mechanisms governing SE.
  • Comparison of SE with zygotic embryogenesis.

Main Results:

  • SE involves apical-basal asymmetry, similar to zygotic embryogenesis.
  • The embryo proper (apical) develops, while the suspensor (basal) undergoes PCD.
  • PCD of the suspensor is vital for the development of the embryo proper.
  • Signaling pathways in apical and basal domains share homologous components.

Conclusions:

  • Somatic embryogenesis is a powerful tool in plant biotechnology and developmental studies.
  • Programmed cell death is a key regulatory event in somatic embryogenesis.
  • Understanding SE pathways can lead to improved plant propagation and trait development.