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La evolución, la evolución de las cosas. ¿Cuándo surgió la fotosíntesis en la Tierra?
1NASA Ames Research Center,Moffett Field, CA 94035, USA. ddesmarais@mail.arc.nasa.gov
Science (New York, N.Y.)
|September 23, 2000
Resumen
La fotosíntesis permitió que la vida se extendiera por la Tierra al proporcionar una fuente de energía confiable. La evidencia sugiere que este proceso vital se originó hace al menos 2.800 millones de años.
Área de la Ciencia:
- Astrobiología Astrobiología.
- Biogeoquímica La biogeoquímica es la bioquímica.
- Biología Molecular Biología Molecular
Sus antecedentes:
- La evolución temprana de la vida estaba limitada por fuentes de energía limitadas.
- Las reacciones químicas abióticas proporcionaron el poder reductor inicial para la vida temprana.
- El surgimiento de la fotosíntesis revolucionó la adquisición de energía para la vida.
Objetivo del estudio:
- * Explorar los orígenes de la fotosíntesis.
- * Presentar evidencia para el surgimiento temprano de la fotosíntesis.
Principales métodos:
- * Revisión de la evidencia geológica para la vida temprana.
- * Análisis de datos biológicos moleculares, incluyendo estudios como el de Xiong et al.
Principales resultados:
- * La fotosíntesis permitió que la vida proliferara al superar la dependencia de la energía química abiótica.
- * Los datos geológicos y moleculares indican que la fotosíntesis surgió hace al menos 2.800 millones de años.
Conclusiones:
- * El advenimiento de la fotosíntesis fue un evento crítico en la historia de la Tierra.
- * La fotosíntesis temprana tuvo un impacto significativo en la evolución y distribución de la vida.
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