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Las funciones de identidad de los órganos florales B y C requieren genes SEPALLATA MADS-box genes

S Pelaz¹, G S Ditta, E Baumann

¹Section of Cell and Developmental Biology, La Jolla, California 92093-0116, USA.

|May 23, 2000

Resumen

Los genes SEPALLATA son cruciales para el desarrollo de las flores. La triple mutante Arabidopsis que carece de los genes SEP1/2/3 desarrolla flores con sólo sépales, revelando su papel en la formación de pétalos, tallo y carpelo.

Área de la Ciencia:

Biología del desarrollo vegetal Biología del desarrollo vegetal
Genética La genética.
Biología molecular La biología molecular.

Sus antecedentes:

La identidad de los órganos florales es un aspecto fundamental del desarrollo de las plantas.
El modelo ABC explica cómo los tipos de órganos florales están especificados por los genes homeóticos.
Los roles precisos de ciertas clases de genes en este proceso aún no se han aclarado completamente.

Objetivo del estudio:

Para investigar la función de los genes SEPALLATA (SEP) en el desarrollo de la flor de Arabidopsis.
Determinar la relación entre los genes SEP y el modelo ABC de identidad de órganos.
Identificar el papel de los genes SEP en la especificación de los tipos de órganos florales.

Principales métodos:

Análisis de plantas de Arabidopsis de triple mutante que carecen de actividad génica SEP1, SEP2 y SEP3.
Caracterización fenotípica de los órganos florales en plantas de tipo silvestre frente a las plantas mutantes.
Análisis genético para comprender la redundancia y la función de los genes.

Principales resultados:

Las plantas de Arabidopsis que carecen de los tres genes SEP (SEP1/2/3) exhiben una completa transformación homeótica de los órganos florales.
Todos los órganos florales en los mutantes triples se desarrollan en sépales.
La actividad de los genes SEP es esencial para el correcto desarrollo de pétalos, estambres y carpelos.

Conclusiones:

SEP1, SEP2 y SEP3 son genes MADS-box funcionalmente redundantes y críticos para la identidad de órganos florales.
Los genes SEP actúan como una clase de genes de identidad de órganos necesarios para el desarrollo de pétalos, estambres y carpelos.
Estos hallazgos amplían el modelo ABC al resaltar el papel indispensable de los genes SEP en la especificación de órganos florales.

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