Germination behavior of Jatropha curcas L. after different imbibition times

F. Lozano; P. Miranda; M. Pompelli

doi:10.21704/pja.v1i1.1065

Autores/as

F. Lozano Universidad Nacional Agraria La Molina (Perú).
P. Miranda Plant Physiology Laboratory, Federal University of Pernambuco, Department of Botany, Recife, PE, Brazil, 50670901
M. Pompelli Plant Physiology Laboratory, Federal University of Pernambuco, Department of Botany, Recife, PE, Brazil, 50670901

DOI:

https://doi.org/10.21704/pja.v1i1.1065

Palabras clave:

biofuel, seed water content, seed moisture, germinability

Resumen

Jatropha curcas es una especie importante para la producción de biocombustible. La especie puede sobrevivir y producir frutos y semillas incluso en condiciones de sequía. Para un establecimiento adecuado en el campo es necesario que las semillas tengan una buena calidad en vigor y viabilidad. En este estudio, evaluamos la relación agua de la semilla con diferentes tiempos de imbibición, en agua desionizada, de 0 a 24 horas. Las semillas embebidas se sembraron en bandejas de polietileno con 1,200 g de arena de río. La germinación se registró todos los días durante 25 días. Las semillas con al
menos 10 mm de radícula en la superficie del suelo se consideraron germinadas. Para determinar el contenido de agua de la semilla (SWC), se pesaron 10 semillas en fresco (SFW), turgentes (STW) y peso seco (SDW) a 105°C durante 24 horas. Después de 24 horas de imbibición, nuestros resultados muestran una disminución en la tasa de germinación de 85% a 47%, y un aumento del tiempo de germinación promedio de 4.8 a 7.1 días. La humedad inicial de la semilla utilizada en este experimento fue de aproximadamente 8% y después de 24 horas de imbibición, el SWC fue de alrededor del 60%. La baja humedad inicial en las semillas produce daño por imbibición debido a que la hidratación del tejido tiene lugar de una manera no controlada, de modo que la reconstrucción de las estructuras internas de las células y los orgánulos se vieron afectadas. De acuerdo con el análisis de PCA, la germinación de la semilla tuvo una correlación negativa con el tiempo de imbibición (r = -0.72, p <0.05) y con la conductiva eléctrica (r = -0.88, p <0.05), variables relacionadas con el vigor de la semilla. Este estudio sugiere que la conductividad eléctrica puede ser útil en J. curcas para la prueba de vigor y sus semillas no necesitan previamente imbibición de agua para mejorar la germinación de las semillas con una humedad inicial inferior al 8%.

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Referencias

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