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Adquisición y transporte de hierro en plantas

Authors: López-Millán, Ana Flor;

Adquisición y transporte de hierro en plantas

Abstract

Las puntas de raíz de remolacha deficiente en Fe presentaron un engrosamiento subapical de color amarillo debido a la acumulación de flavinas, así como un aumento del número de pelos radiculares en estas zonas. La deficiencia de Fe indujo un aumento de 11 veces en la actividad reductasa férrica y de 4 veces en la capacidad de acidificación del medio, respuestas típicas de las raices de las plantas de estrategia I. La concentración de ácidos orgánicos y las actividades de diversos enzimas relacionados con la síntesis y metabolismo de estos compuestos aumentaron en las secciones amarillas de las puntas de raíz deficientes, indicando un aumento de la capacidad de fijar carbono, via fosfoenol piruvato carboxilasa, inducido por la deficiencia de Fe. Además, la deficiencia de Fe produjo un aumento en la concentración de nucleótidos de piridina, ATP, quinonas y en la tasa de consumo de oxígeno, surgiriendo la existencia de un aumento en la actividad mitocondrial en estas secciones amarillas, que proporcionaría poder reductor para la reductasa férrica. La concentración de ácidos orgánicos también aumentó en xilema y fluido apoplástico de hoja apoyando la existencia de un aumento en el flujo de C desde las raíces hasta las hojas de las plantas deficientes.

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Keywords

Plantas - Contenido en hierro

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selected citations
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This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
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popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
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