Video Experimental Relacionado
Updated: May 4, 2026
08:54
Imaging Spatial Reorganization of a MAPK Signaling Pathway Using the Tobacco Transient Expression System
Published on: March 20, 2016
9.2K
Las hojas asimétricas1 median el patrón de las hojas y la función de las células madre en la Arabidopsis
Nature
|January 5, 2001
Resumen
El mutante de las hojas asimétricas1 (as1) interrumpe el desarrollo de las plantas al afectar el mantenimiento de las células madre y el patrón de órganos laterales. Este estudio revela una vía genética que involucra a AS1 en la regulación del meristema shoot apical.
Área de la Ciencia:
- Biología del desarrollo vegetal Biología del desarrollo vegetal
- Genética molecular genética molecular.
- La organogénesis de las plantas.
Sus antecedentes:
- Los meristemas de las plantas mantienen las células madre y especifican las células fundadoras para el desarrollo de órganos laterales.
- Los patrones de órganos laterales ocurren a lo largo de los ejes proximo-distal, dorsoventral y mediolateral.
- Las hojas asimétricas mutantes de Arabidopsis1 (as1) están implicadas en la interrupción de estos procesos.
Objetivo del estudio:
- Investigar el papel del gen AS1 en la función del meristema apical de las plantas y el patrón de órganos laterales.
- Aclarar las interacciones genéticas y los mecanismos reguladores subyacentes a la función AS1.
Principales métodos:
- Análisis genético de la Arabidopsis as1 mutante.
- Caracterización molecular de la función del gen AS1.
- Análisis de patrones de expresión génica e interacciones genéticas.
Principales resultados:
- La mutación as1 interrumpe el patrón de los órganos laterales.
- AS1 codifica una proteína del dominio myb que regula negativamente los genes homeobox KNAT1 y KNAT2.
- AS1 está regulado negativamente por el gen homeobox meristemático SHOOT MERISTEMLESS (STM).
Conclusiones:
- Una vía genética que involucra AS1, KNAT1, KNAT2 y STM diferencia las células madre de las células fundadoras de órganos en el meristema shoot apical.
- Esta vía es crucial para regular la morfogénesis de los brotes.
- Las interacciones entre los genes de los órganos primordia y los genes meristemáticos son esenciales para el desarrollo de las plantas.
Videos de Conceptos Relacionados
03:02Primary and Secondary Growth in Roots and Shoots
46.7K
Vascular plants, which account for over 90% of the Earth’s vegetation, all undergo primary growth—which lengthens roots and shoots. Many land plants, notably woody plants, also undergo secondary growth—which thickens roots and shoots.
46.7K
02:19Morphogenesis
19.9K
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.
19.9K
02:16Light Acquisition
8.0K
In order to produce glucose, plants need to capture sufficient light energy. Many modern plants have evolved leaves specialized for light acquisition. Leaves can be only millimeters in width or tens of meters wide, depending on the environment. Due to competition for sunlight, evolution has driven the evolution of increasingly larger leaves and taller plants, to avoid shading by their neighbors with contaminant elaboration of root architecture and mechanisms to transport water and nutrients.
8.0K
01:25Cell Signaling in Plants
4.5K
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...
4.5K
01:14Cell Adhesion in Plants
2.4K
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.
Pectins are complex heteropolymers mainly composed of negatively-charged α-D-glucopyranosyl uronic acid and some neutral glycosyl residues such as α-L-rhamnopyranose, α-L-arabinofuranose,...
Pectins are complex heteropolymers mainly composed of negatively-charged α-D-glucopyranosyl uronic acid and some neutral glycosyl residues such as α-L-rhamnopyranose, α-L-arabinofuranose,...
2.4K
01:12Role Of Notch Signalling In Intestinal Stem Cell Renewal
1.8K
Notch signaling was first discovered in Drosophila melanogaster, where it is involved in cell lineage differentiation. Notch signaling regulates the maintenance and differentiation of intestinal stem cells or ISCs by controlling the expression of atonal homolog 1 or Atoh1. Atoh1 directs cells to differentiate into secretory cells.
Direct cell-to-cell contact is needed for the activation of Notch signaling. The signal is initiated when a notch ligand binds to a receptor on an adjacent cell, also...
Direct cell-to-cell contact is needed for the activation of Notch signaling. The signal is initiated when a notch ligand binds to a receptor on an adjacent cell, also...
1.8K