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Evolución de la forma de la hoja a través de la duplicación, la diversificación reguladora y la pérdida de un gen
Daniela Vlad1, Daniel Kierzkowski, Madlen I Rast
1Department of Plant Sciences, University of Oxford, South Parks Road, Oxford OX1 3RB, UK.
Science (New York, N.Y.)
|February 18, 2014
Resumen
La proteína RECOMPLEXIDAD REDUCIDA (RCO) controla la disección de las hojas en plantas como la Cardamina hirsuta. Su evolución y pérdida en Arabidopsis thaliana explican las diferencias en la complejidad de las hojas, destacando la duplicación de genes.
Área de la Ciencia:
- Morfología vegetal de las plantas.
- Genética del desarrollo genética del desarrollo.
- Biología evolutiva Biología evolutiva.
Sus antecedentes:
- Arabidopsis thaliana exhibe hojas simples, mientras que su pariente Cardamine hirsuta muestra hojas complejas y disecadas con folletos.
- Comprender la base genética de la diversidad morfológica de las hojas es crucial en la ciencia de las plantas.
Objetivo del estudio:
- Para investigar los mecanismos genéticos subyacentes a la disección de hojas en Cardamine hirsuta en comparación con Arabidopsis thaliana.
- Identificar los genes clave y las vías reguladoras que controlan el desarrollo del prospecto.
Principales métodos:
- Genética comparada y genética comparada.
- Las transferencias de genes interespecíficos.
- Las imágenes en lapso de tiempo.
- Análisis molecular de la expresión génica.
Principales resultados:
- La proteína del homeodomo de REDUCIDA COMPLEJIDAD (RCO) es esencial para el desarrollo del prospecto en C. hirsuta.
- RCO funciona en el desarrollo de la hoja al reprimir el crecimiento en los flancos, esculpiendo folletos.
- RCO evolucionó a través de la duplicación de genes en las Brassicaceae y se perdió en A. thaliana, lo que lleva a la simplificación de la hoja.
Conclusiones:
- La duplicación de genes, la pérdida y la evolución reguladora de RCO generaron diversidad en la forma de las hojas.
- El patrón de expresión específico de la especie de RCO subyace a su papel distinto en la formación de folletos.
- La modificación de los patrones de crecimiento local durante la organogénesis es clave para la evolución de la morfología de las plantas.
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