Estrategias fotosintéticas y morfo-anatómicas foliares de Ligustrum sinense (Oleaceae), una especie exótica invasora en el sotobosque de la selva de yungas.
DOI:
https://doi.org/10.31055/1851.2372.v58.n2.40335Palavras-chave:
Anatomía foliar, bosque subtropical, eficiencia en uso de agua, fotosíntesis, invasión biológica, ligustrina, Noroeste ArgentinoResumo
Introducción y objetivos: Ligustrum sinense (ligustrina) es una reconocida especie exótica invasora. El objetivo de este trabajo fue estudiar los rasgos fisiológicos y anatómicos foliares de renovales de ligustrina que podrían otorgarle ventajas para su establecimiento en un ambiente de sotobosque de la selva de Yungas.
M&M: Este estudio se realizó en el Parque Nacional Aconquija (Tucumán, Argentina). Se evaluaron los rasgos morfo-anatómicas foliares y fisiológicos en un ambiente de sotobosque durante primavera-verano e invierno. Se analizaron las características anatómicas de la lámina foliar y variables fisiológicas relacionadas al intercambio de gases. Además, se calculó el área foliar específica, densidad de hojas, contenido de nitrógeno foliar y eficiencia fotosintética en el uso del nitrógeno foliar.
Resultados: Durante primavera-verano L. sinense muestra una mayor eficiencia fotosintética en el uso del nitrógeno foliar y una mayor asimilación fotosintética en condiciones saturantes. La eficiencia de carboxilación, eficiencia intrínseca del uso del agua y espesor de hoja fueron 26%, 34% y 41% mayores en invierno con relación a primavera-verano. Durante el invierno se registró un aumento en el espesor de la lámina lo que contribuiría a mejorar el intercambio de CO2 en época de condiciones subóptimas para la fotosíntesis.
Conclusiones: La ligustrina fotosintetiza todo el año y su éxito para establecerse en el sotobosque de la selva de Yungas podría explicarse en parte por las estrategias morfo-anatómicas y fisiológicas desplegadas.
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