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Seed germination and seedling emergence of Gundelia tournefortii L. in response to some environmental factors
Germinación de semillas y emergencia de plántulas de Gundelia tournefortii L. en respuesta a algunos factores ambientales
DOI:
https://doi.org/10.15446/agron.colomb.v42n1.114684Keywords:
water potential, salt stress, sowing depth, seedling emergence (en)potencial hídrico, estrés salino, profundidad de siembra, emergencia de plántulas (es)
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Gundelia tournefortii has long been considered a valuable medicinal and edible plant in the Mediterranean areas. Seeds are the main means through which G. tournefortii can propagate in space and in time. The aim of this experiment was to evaluate the impact of environmental factors on seed germination of this wild medical and food plant. In this study, we investigated the germination and emergence responses of seeds of G. tournefortii collected from Kamyaran and Sonqor in western Iran to the environmental factors of light, temperature, salt stress, water potential, and sowing depth. The results showed that the optimal temperature for germination was 20°C, with a maximum germination percentage of about 70% for both populations. In general, the two populations responded to the tested factor(s) similarly. Light was not required for germination of G. tournefortii. The species was tolerant to water stress (germinating more than 50% under water potential up to -1.0 MPa), while sensitive to salt stress. More than 50% of the seedlings of G. tournefortii were able to emerge from depths more than 12 cm. According to the results, rain-fed fields located in the western parts of Iran are suitable for the planting of G. tournefortii.
Gundelia tournefortii es considerada como una valiosa planta medicinal y de alimento en las zonas mediterráneas. Las semillas son el principal medio por el cual G. tournefortii puede garantizar su permanencia en el espacio y en el tiempo. El objetivo de este estudio fue evaluar el impacto de los factores ambientales en la germinación de las semillas de esta planta medicinal silvestre. En este estudio, investigamos las respuestas de germinación y emergencia de semillas de G. tournefortii recolectadas en Kamyaran y Sonqor, ubicadas en el oeste de Irán, a los factores ambientales de temperatura, luz, estrés salino, potencial osmótico y profundidad de siembra. Los resultados mostraron una temperatura óptima de 20°C con un porcentaje máximo de germinación de aproximadamente 70% para ambas poblaciones. En general, ambas poblaciones respondieron de manera similar a los factores evaluados. La luz no se requirió para la germinación de G. tournefortii. Las plantas fueron tolerantes al estrés hídrico (germinando más del 50% bajo potencial hídrico hasta -1,0 MPa), mientras que fueron sensibles al estrés salino. Más del 50% de las plántulas de G. tournefortii pudieron emerger de profundidades de enterramiento de más de 12 cm. Acorde a los resultados, los campos de secano ubicados en la parte occidental de Irán son favorables para la plantación de G. tournefortii.
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