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Sacarosa: un elicitor constitutivo de la síntesis de las fitoalexinas

C J Cooksey, P J Garratt, J S Dahiya

Science (New York, N.Y.)

|June 24, 1983

Resumen

La sacarosa de los extractos de la planta del guisante (Cajanus cajan) desencadena la acumulación de fitoalexinas en las hojas heridas. Esta respuesta requiere la desrepresión génica, lo que indica un mecanismo de defensa de la planta.

Área de la Ciencia:

Biología vegetal Biología vegetal
La bioquímica es la bioquímica.
Biología molecular La biología molecular.

Sus antecedentes:

Las fitoalexinas son compuestos de defensa de las plantas.
El guisante (Cajanus cajan) es una leguminosa tropical.
Las respuestas de la planta inducidas por la herida son cruciales para la defensa.

Objetivo del estudio:

Para identificar el causante de la acumulación de fitoalexina en el pea de paloma.
Para caracterizar la relación dosis-respuesta del provocador.
Para investigar el mecanismo molecular subyacente a la respuesta de la fitoalexina.

Principales métodos:

Aplicación de extractos de plantas a hojas heridas de guisantes de paloma.
Purificación e identificación del componente activo.
Ensayos de dosis-respuesta con el compuesto purificado y los azúcares relacionados.
Estudios de inhibición utilizando inhibidores de la síntesis de proteínas (actinomicina D, puromicina, cicloheximida).

Principales resultados:

Se identificó a la sacarosa como el principal causante de la acumulación de fitoalexinas.
La acumulación de fitoalexina mostró una dosis-respuesta logarítmica a la sacarosa.
Otros azúcares fueron ineficaces para inducir la producción de fitoalexina.
Los inhibidores de la expresión génica y la síntesis de proteínas bloquearon la respuesta inducida por la sacarosa.

Conclusiones:

La sacarosa actúa como un elicitor específico de la síntesis de fitoalexinas en el pea de paloma.
La respuesta de la fitoalexina a la sacarosa implica la desrepresión génica y la síntesis de proteínas de novo.
Este estudio aclara una nueva vía de señalización de defensa de las plantas que involucra a la sacarosa.

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