Video Experimental Relacionado
Updated: Jul 13, 2026
10:28
Preparation of Chloroplast Sub-compartments from Arabidopsis for the Analysis of Protein Localization by Immunoblotting or Proteomics
Published on: October 19, 2018
El origen de las algas rojas y la evolución de los cloroplastos
D Moreira1, H Le Guyader, H Philippe
1Equipe Phylogénie et Evolution Moléculaires, CNRS UPRES-A 8080, Université Paris-Sud, Orsay, France. david.moreira@bc4.u-psud.fr
Nature
|May 16, 2000
Resumen
Este estudio proporciona una fuerte evidencia de marcadores nucleares que apoyan una estrecha relación evolutiva entre las plantas verdes y las algas rojas. Este hallazgo refuerza la hipótesis de un solo evento de endosimbiosis primaria en el origen del reino Plantae.
Área de la Ciencia:
- * Biología evolutiva.
- *Ficología *Ficología *Ficología
- * La genómica es la genómica.
Sus antecedentes:
- * La endosimbiosis fotosintética primaria involucró una cianobacterium y un huésped eucariota.
- * Se supone que tres grupos de organismos (plantas verdes, algas rojas, glaucófitos) se originaron a partir de este evento.
- * Análisis filogenéticos previos de genes codificados en el núcleo produjeron resultados contradictorios con respecto a las relaciones entre estos grupos.
Objetivo del estudio:
- * Para resolver las incertidumbres filogenéticas con respecto a la historia evolutiva de los endosimbiontes fotosintéticos primarios.
- * Investigar la relación de hermandad entre las plantas verdes y las algas rojas utilizando marcadores nucleares.
- * Para determinar la posición filogenética de los glaucófitos en relación con las plantas verdes y las algas rojas.
Principales métodos:
- * Análisis del marcador del gen nuclear del factor de alargamiento 2.
- * Inclusión de nuevas algas rojas y secuencias de protistas en análisis filogenéticos.
- * Análisis filogenéticos multigénicos utilizando fusiones de 13 y 6 marcadores nucleares.
Principales resultados:
- * Apoyo significativo para una relación de hermandad entre las plantas verdes y las algas rojas.
- * Los análisis de múltiples genes corroboran la hermandad entre las plantas verdes y las algas rojas.
- * La evidencia sugiere que las glaucófitas pueden ser los parientes más cercanos a las plantas verdes / clado de algas rojas.
Conclusiones:
- * Los marcadores nucleares proporcionan una fuerte evidencia de un solo evento de endosimbiosis primaria.
- * Apoya un reino monofilético Plantae que abarca plantas verdes, algas rojas y glaucófitos.
- * Resuelve preguntas filogenéticas de larga data con respecto a la evolución temprana de los eucariotas.
Videos de Conceptos Relacionados
01:08The Anatomy of Chloroplasts
Green algae and plants, including green stems and unripe fruit, harbor specialized organelles called chloroplasts to carry out photosynthesis. They coordinate both stages of photosynthesis — the light-dependent reactions and the light-independent reactions. The light-dependent reactions use sunlight to release oxygen and produce chemical energy in the form of ATP and NADPH, and the light-independent reactions capture CO2 and use ATP and NADPH to produce sugar.
Structure of Chloroplasts
A...
Structure of Chloroplasts
A...
01:24Eukaryotic Evolution
The endosymbiont theory is the most widely accepted theory of eukaryotic evolution; however, its progression is still somewhat debated. According to the nucleus-first hypothesis, the ancestral prokaryote first evolved a membrane to enclose DNA and form the nucleus. Conversely, the mitochondria-first hypothesis suggests that the nucleus was formed after endosymbiosis of mitochondria.
Contrary to the endosymbiont theory, the eukaryote-first hypothesis proposes that the simpler prokaryotic and...
Contrary to the endosymbiont theory, the eukaryote-first hypothesis proposes that the simpler prokaryotic and...
01:28Overview of Algae
The kingdom Archaeplastida encompasses red and green algae, along with land plants. Unlike other protists with chloroplasts that arose through secondary endosymbiosis, only red and green algae originated from primary endosymbiotic events. This diverse group of eukaryotic organisms contains chlorophyll and performs oxygenic photosynthesis.Algae exist in various forms, from large brown kelp in coastal waters to green scum in puddles and stains on rocks or soil. Some species are responsible for...
01:23Red Algae
Red algae, also known as rhodophytes, are primarily found in marine environments, though some species inhabit freshwater and terrestrial ecosystems. These organisms exist in both unicellular and multicellular forms, with some multicellular varieties reaching macroscopic sizes.As phototrophic organisms, red algae contain chlorophyll a; however, their chloroplasts lack chlorophyll b. Instead, they possess phycobiliproteins, which serve as major light-harvesting pigments, similar to those found in...
01:21Green Algae
Green algae, also referred to as chlorophytes, are different from red algae in having the chloroplasts containing chlorophylls a and b, which give them their distinct green hue. However, they lack phycobiliproteins, preventing them from developing the red or blue-green pigmentation seen in red algae. In terms of photosynthetic pigment composition, green algae closely resemble plants and share a close evolutionary relationship with them. Taxonomically Green algae belong to Phylum Chlorophyta in...
01:26Origin of Photosynthesis
Photosynthesis represents a fundamental biological process that transformed Earth's atmosphere and paved the way for complex life. Emerging roughly 3.4–3.8 billion years ago, the earliest photosynthetic organisms harnessed light energy to produce organic compounds. These anoxygenic phototrophs used electron donors like hydrogen sulfide (H₂S) or ferrous iron (Fe²⁺), rather than water, and did not release molecular oxygen (O₂) as a byproduct. Various groups, including green sulfur and purple...