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Predicción de la evolución de la fotosíntesis C4: pasos modulares e individualmente adaptables en un paisaje de
David Heckmann1, Stefanie Schulze, Alisandra Denton
1Institute for Computer Science, Heinrich Heine University, 40225 Düsseldorf, Germany.
Cell
|June 25, 2013
Resumen
La biología evolutiva ahora puede predecir trayectorias adaptativas para sistemas complejos como la fotosíntesis C4. Las simulaciones muestran que la fotosíntesis C4 evoluciona a través de pasos accesibles, con rasgos bioquímicos que forman módulos.
Área de la Ciencia:
- Biología evolutiva Biología evolutiva.
- La ciencia de las plantas es la ciencia de las plantas.
- La bioquímica es la bioquímica.
Sus antecedentes:
- Predecir las trayectorias adaptativas macroevolutivas es un objetivo clave en la biología evolutiva.
- Los sistemas biológicos complejos a menudo carecen de correlaciones claras de la aptitud del organismo, lo que dificulta los modelos predictivos.
- La fotosíntesis C4, más eficiente que la fotosíntesis C3 bajo ciertas condiciones, ha evolucionado repetidamente desde el C3 en las plantas.
Objetivo del estudio:
- Para simular el paisaje de acondicionamiento físico que conecta la fotosíntesis C3 y C4.
- Determinar la accesibilidad evolutiva de la fotosíntesis C4 desde C3.
- Investigar la modularidad y el orden de la evolución de los rasgos bioquímicos durante la transición de C3 a C4.
Principales métodos:
- Simulación computacional del paisaje físico entre C3 y C4. fotosíntesis.
- Análisis de la accesibilidad evolutiva a pesar de la epistasis del signo.
- Examen de la evolución modular de los subtratos bioquímicos.
Principales resultados:
- La fotosíntesis C4 es evolutivamente accesible desde C3 a través de pasos adaptativos individualmente, incluso con epistasis de signo significativo.
- Los subtratos bioquímicos involucrados en la transición C3-C4 evolucionan en módulos.
- Las especies vegetales con rasgos intermedios C3-C4 se encuentran en trayectorias evolutivas previstas.
- No se observó ninguna desaceleración en la adaptación o disminución de las ganancias de aptitud física a lo largo de las trayectorias evolutivas simuladas.
Conclusiones:
- La evolución de la fotosíntesis C4 a partir de C3 es robusta y procede a través de rasgos modularmente en evolución.
- Las especies vegetales intermedias C3-C4 representan verdaderos estados transitorios en esta vía evolutiva.
- El estudio proporciona un marco para comprender y predecir trayectorias adaptativas en sistemas biológicos complejos.
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