Tolerancia a la sombra en plantas de caléndula (Calendula officinalis)
Shade tolerance of marigold plants (Calendula officinalis)
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La caléndula (Calendula officinalis L.) es la segunda planta medicinal más comercializada en Colombia. El estudio, se realizó en Tunja, Colombia, en el que se evaluaron los contenidos de clorofila y de carotenoides en plantas de caléndula, expuestas a condiciones de plena iluminación solar y sombra, bajo una malla de fibra sintética, que reduce la luz en un 35%. También se evaluaron los parámetros de fluorescencia de la clorofila y la tasa de transporte de electrones. En comparación con las plantas a pleno sol, las plantas sombreadas presentaron una mayor proporción de clorofila a/b y una proporción inferior de carotenoides/clorofila. Los valores de fluorescencia máxima (Fm), la fluorescencia variable (Fv) y la eficiencia cuántica máxima del fotosistema II (la relación Fv/ Fm) aumentaron en las plantas bajo sombra, mientras que la tasa de transporte de electrones, se redujo. Estos resultados sugieren que las plantas de caléndula son muy sensibles a las condiciones de poca luz.
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