Video Experimental Relacionado
Updated: Jul 12, 2026
09:04
Discovery of New Intracellular Pathogens by Amoebal Coculture and Amoebal Enrichment Approaches
Published on: October 27, 2013
Los hongos glomaleos del Ordoviciano
D Redecker1, R Kodner, L E Graham
1Department of Plant and Microbial Biology, 111 Koshland Hall, University of California, Berkeley, CA 94720, USA. redecker@nature.berkeley.edu
Science (New York, N.Y.)
|September 16, 2000
Resumen
Los antiguos fósiles de hongos del período Ordovícico sugieren que los hongos parecidos a los Glomales coexistieron con las primeras plantas terrestres. Estos hallazgos apoyan el papel crucial de los hongos en la colonización de las plantas y los primeros ecosistemas terrestres.
Área de la Ciencia:
- La paleomicología.
- Interacciones entre plantas y hongos.
- Ecosistemas Terrestres Tempranos Los primeros ecosistemas terrestres fueron
Sus antecedentes:
- El período Ordovícico (485-443 millones de años atrás) fue testigo de la colonización inicial de la tierra por las plantas.
- Los orígenes evolutivos de los hongos terrestres se debaten, con datos moleculares que sugieren orígenes hace unos 600 millones de años.
Objetivo del estudio:
- Para investigar la presencia y la morfología de los primeros hongos terrestres.
- Evaluar el papel potencial de estos hongos en la facilitación de la terrestrización de las plantas.
Principales métodos:
- Examen microscópico de hifas y esporas fúngicas fosilizadas.
- Comparación morfológica de los hongos fósiles con los grupos de hongos modernos, en particular los hongos arbusculares micorrizales.
Principales resultados:
- Fósiles del Ordovícico de Wisconsin (aprox. 460 millones de años) exhiben características similares a las de los modernos hongos arbusculares micorrizales (Glomales, Zygomycetes).
- Estos hongos parecidos a los Glomales estaban presentes cuando la flora terrestre probablemente se limitaba a las plantas de nivel de briofito.
- Los hallazgos se alinean con las estimaciones filogenéticas moleculares que sitúan el origen de los principales grupos de hongos terrestres hace unos 600 millones de años.
Conclusiones:
- La evidencia fósil indica la presencia de hongos parecidos a Glomales durante las primeras etapas de la terrestrización de las plantas.
- Estos antiguos hongos pueden haber sido fundamentales para permitir que las plantas colonicen la tierra.
- El registro fósil apoya las estimaciones del reloj molecular para la diversificación de los hongos terrestres.
Videos de Conceptos Relacionados
01:29Bacterial Flora of the Large Intestine
The gut microbiome is formed by a vast and diverse community of bacteria that colonizes our large intestine. These bacteria start residing in the gut from birth and continue diversifying throughout life, influenced by factors such as diet, lifestyle, and stress. The gut bacterial community also includes bacteria from food and those that enter the colon through the anus.
The normal gut flora of the colon plays a critical role in generating essential vitamins such as vitamins K, B5, and B7.
The normal gut flora of the colon plays a critical role in generating essential vitamins such as vitamins K, B5, and B7.
01:18Other Unique Bacteria
Magnetic bacteria exhibit a directed movement called magnetotaxis, driven by structures called magnetosomes. These magnetosomes consist of chains of magnetic particles made of either magnetite (Fe₃O₄) or greigite (Fe₃S₄) and are organized in a linear conformation by a protein scaffold within invaginations of the cell membrane. The bacteria align along the north–south magnetic field lines, much like a compass needle. They are typically microaerophilic or anaerobic and are commonly found near the...
01:27The Skin Microbiota
The human skin serves as a complex ecosystem inhabited by a diverse community of microorganisms, including bacteria, fungi, and viruses. This microbiome plays a critical role in maintaining skin health and defending against pathogenic invaders. The composition of microbial communities varies significantly across different regions of the body, influenced primarily by the local levels of moisture and sebum.Regional Variation in Skin MicrobiotaCutibacterium acnes predominantly colonizes sebaceous...
01:22Microbiome of the Eye
The human eye has a specialized microbiota that reflects its unique anatomical and immunological environment. This low-biomass microbial community predominantly colonizes the conjunctiva and eyelid margins, playing a vital role in ocular surface homeostasis and defense. Despite its proximity to the richly colonized facial skin, the ocular surface maintains a distinct microbial profile due to continuous mechanical and biochemical defense mechanisms.The conjunctival surface hosts fewer microbial...
01:27Microbiota of the Large Intestine
The large intestine hosts the most densely populated microbial ecosystem in the human body. This complex community primarily consists of anaerobic bacteria, with Bacillota (formerly Firmicutes) and Bacteroidota (formerly Bacteroidetes) as the predominant groups. The distribution of these microbes varies along different sections of the large intestine, influenced by local environmental factors such as oxygen availability and nutrient composition.The cecum, located at the beginning of the large...
01:21Microbiota Modulation by Antibiotics
Antibiotics have revolutionized modern medicine by saving countless lives from bacterial infections. However, their widespread use has inadvertently harmed the delicate balance of the human gut microbiota. The gut microbiota, a complex community of bacteria, archaea, viruses, and fungi, plays a vital role in regulating metabolism, immune responses, and maintaining intestinal health. Antibiotics, especially broad-spectrum types, disrupt this ecosystem by eradicating both harmful and beneficial...