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El determinante masculino de la autoincompatibilidad en Brassica
C R Schopfer1, M E Nasrallah, J B Nasrallah
1Department of Plant Biology, Cornell University, Ithaca, NY 14853, USA.
Science (New York, N.Y.)
|November 27, 1999
Resumen
En la autoincompatibilidad de Brassica, el producto del gen SCR es esencial para el reconocimiento del polen. Este gen determina la especificidad del polen, probablemente mediante la interacción con la quinasa del receptor del estigma, impidiendo la auto-polinización.
Área de la Ciencia:
- Biología reproductiva de las plantas Biología reproductiva de las plantas
- Genética molecular genética molecular.
- La bioquímica es la bioquímica.
Sus antecedentes:
- Los sistemas de autoincompatibilidad (SI) impiden la autofertilización en las plantas con flores.
- En Brassica, los genes del locus S controlan el reconocimiento del polen en las células epidermales del estigma, inhibiendo el crecimiento del tubo de polen.
- Una receptor quinasa en el estigma y un determinante de polen son clave para este reconocimiento.
Objetivo del estudio:
- Identificar y caracterizar el determinante del polen en el sistema de autoincompatibilidad controlado por locus de Brassica S.
- Aclarar el mecanismo molecular del reconocimiento y la especificidad del polen.
Principales métodos:
- Se realizaron estudios de pérdida de función y ganancia de función en el gen SCR.
- Análisis genético de la autoincompatibilidad controlada por S locus.
Principales resultados:
- El producto del gen SCR fue identificado como el determinante del polen.
- SCR es necesario y suficiente para determinar la especificidad de autoincompatibilidad del polen.
- SCR puede funcionar como un ligando para la proteína quinasa del receptor estigmático.
Conclusiones:
- El producto del gen SCR juega un papel crucial en el reconocimiento del polen dentro del sistema de autoincompatibilidad de la Brassica.
- La comprensión de la función SCR proporciona información sobre los mecanismos de aislamiento reproductivo de las plantas.
- Este hallazgo aclara la base molecular de la autoincompatibilidad de Brassica.
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