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La fijación del nitrógeno y la senescencia retardada de las hojas en la soja.

S S Abu-Shakra, D A Phillips, R C Huffaker

Science (New York, N.Y.)

|March 3, 1978

Resumen

Las plantas de soja con retraso en la senescencia de las hojas retienen la clorofila y la fijación del nitrógeno por más tiempo, lo que potencialmente aumenta el rendimiento de las semillas y la fijación simbiótica del nitrógeno durante el desarrollo.

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Área de la Ciencia:

Ciencias Agrícolas Ciencias Agrícolas
Fisiología vegetal Fisiología vegetal
La bioquímica es la bioquímica.

Sus antecedentes:

El rendimiento de la soja está influenciado por la senescencia de las hojas, el proceso de envejecimiento y la reasignación de nutrientes.
El mantenimiento de la actividad fotosintética y la fijación de nitrógeno durante el desarrollo de las semillas es crucial para maximizar la productividad de los cultivos.

Objetivo del estudio:

Para investigar una población de soja que exhibe una senescencia retardada de las hojas.
Evaluar las implicaciones de la senescencia retardada en los procesos fisiológicos clave y la mejora potencial del rendimiento.

Principales métodos:

Observación de una población de soja con retraso en la senescencia de las hojas.
Medición del contenido de clorofila en las hojas.
Análisis de la actividad de la ribulosebisfosfato carboxilasa.
Cuantificación de la fijación del nitrógeno (reducción del acetileno) en los nódulos de la raíz.

Principales resultados:

La población de soja mantuvo la actividad de clorofila y ribulosebisfosfato carboxilasa durante toda la maduración de la semilla.
La actividad de fijación de nitrógeno en los nódulos de las raíces también se mantuvo durante la fase de maduración de la semilla.
La senescencia tardía de las hojas se asoció con una función fisiológica prolongada.

Conclusiones:

La senescencia tardía de las hojas en la soja preserva las funciones fisiológicas vitales durante el desarrollo de las semillas.
La incorporación de este rasgo en las variedades de soja de élite podría mejorar tanto el rendimiento de las semillas como la fijación simbiótica del nitrógeno.