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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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Plant cells communicate to coordinate their cycle of growth, flowering and fruiting, and activities in roots, shoots, and leaves in response to the changing environmental conditions. Plant signaling is distinct from animal signaling. Plants primarily utilize enzyme-linked receptors, whereas the largest class of cell-surface receptors in animals are G-protein coupled receptors (GPCRs). Unlike animals, receptor tyrosine kinases are rare in plants. Instead, plants have a diverse class of...
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Plants have rigid cell walls that are made up of cell wall polysaccharides that mediate cell-cell adhesion. The primary cell walls of plants consist of two independent and interacting polysaccharide networks: a pectin matrix that embeds the second network comprising cellulose and hemicelluloses.
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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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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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Cell division is essential for organismal growth and development. In animal cells, the central spindle and its associated proteins form the midbody, a structure that has an essential role in cytokinesis. In plants, the central spindle, along with the microtubules, actin, and other cell components, matures into the phragmoplast, which is necessary for cytokinesis. Unlike the stationary midbody, the phragmoplast expands centrifugally, eventually leading to the formation of the new cell wall.
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Video Experimental Relacionado

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A Method for Characterizing Embryogenesis in Arabidopsis
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Los péptidos derivados de las células centrales regulan el patrón embrionario temprano en las plantas con flores.

Liliana M Costa1, Eleanor Marshall, Mesfin Tesfaye

  • 1Department of Plant Sciences, University of Oxford, South Parks Road, OX1 3RB, UK.

Science (New York, N.Y.)
|April 12, 2014
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Resumen

El desarrollo del embrión en las plantas se basa en los péptidos del FACTOR 1 (ESF1) que rodea al embrión, que son cruciales para establecer el linaje celular inicial y el patrón. Estos péptidos, actuando con otros factores, guían el crecimiento embrionario temprano en Arabidopsis.

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Área de la Ciencia:

  • Biología del desarrollo vegetal Biología del desarrollo vegetal
  • Genética molecular genética molecular.
  • Biología de la reproducción Biología reproductiva.

Sus antecedentes:

  • La embriogénesis de las plantas comienza con el establecimiento del eje apical-basal, pero sus fundamentos moleculares no se comprenden completamente.
  • El patrón embrionario temprano es crítico para el desarrollo exitoso de las plantas.

Objetivo del estudio:

  • Para dilucidar los mecanismos moleculares que regulan la embriogénesis temprana de las plantas y el patrón de proembrión en Arabidopsis.
  • Identificar los actores moleculares clave involucrados en el establecimiento del linaje celular basal zigótico.

Principales métodos:

  • Análisis de la acumulación y localización de péptidos del factor circundante del embrión 1 (ESF1).
  • Análisis bioquímicos y estructurales de la escisión del propéptido ESF1.
  • Investigando la función no celular autónoma de los péptidos ESF1.
  • Análisis funcional de la vía de la proteína quinasa activada por mitógeno YODA.

Principales resultados:

  • Los péptidos del factor circundante del embrión 1 (ESF1) son esenciales para la formación del linaje celular basal cigótico y el patrón proembrionario en Arabidopsis.
  • Los péptidos ESF1 se acumulan en los gametos y las células del endospermo, actuando de una manera no celular autónoma.
  • La escisión de los propéptidos ESF1 genera péptidos maduros biológicamente activos.
  • Los péptidos ESF1 sinergizan con SHORT SUSPENSOR para promover el alargamiento del suspensor a través de la vía YODA.

Conclusiones:

  • El segundo gameto femenino y su endospermo derivado juegan un papel regulador en el patrón embrionario temprano en las plantas con flores.
  • Los péptidos ESF1 son reguladores clave de la embriogénesis temprana, vinculando la función del gameto con el desarrollo embrionario.