Resumen
Avicennia germinans (L.) Stearn, un mangle neotropical, crece en suelos salinos y carentes de oxígeno. La arquitectura de su sistema radical hace posible que se formen raíces absorbentes en una posición que les permite crecer hacia sustratos (suelo o agua) con salinidades favorables. Neumatóforos y espacios intercelulares grandes en el interior de las raíces sirven para el suministro de oxígeno a las células. La formación del aerénquima reduce el número de células vivas consumidoras de oxígeno. La formación de capas celulares encorchadas que cubren a veces hasta los meristemas apicales impide la difusión de oxígeno del interior de las raíces hacia el sustrato. De esta manera, la absorción de iones se limita a las puntas de las raíces en crecimiento y a raíces muy finas sin crecimiento en grosor.
Palabras clave
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