Silicio en la micropropagación de fresa cv. ‘Jonica’

Ana Luiza Arruda, Augusto José Posser, Francine Regianini Nerbass, Aike Anneliese Kretzschmar

Resumen


La adición de silicio (Si) a los medios de cultivo ha demostrado una acción beneficiosa para el crecimiento y desarrollo de plántulas de varias especies cultivadas in vitro. Este artículo tuvo como objetivo determinar el efecto del silicato de potasio en la propagación in vitro de fresa (Fragaria x ananassa Duch). Las plántulas de fresa italiana ‘Jonica’ obtenida de brotes de ápice regenerados in vitro se cultivaron en viales de vidrio que contenían 30 ml del medio de cultivo MS solidificado con 6 g de agar l-1. Se agregaron cinco concentraciones de silicato de potasio (0.0, 0.5, 1.0, 1.5 y 2.0 g l-1) al medio de cultivo. El pH se ajustó a 5.8 ± 0.2 antes de la esterilización en autoclave. El experimento se mantuvo en una sala de crecimiento con irradiancia de 42 μmol m-2 s-1, a 25 ± 2 °C y 16 horas de fotoperíodo. Las variables analizadas fueron el número de brotes, la longitud promedio de los brotes (cm), el número de hojas, el índice SPAD y el número de raíces y la longitud promedio de las raíces (cm). Para la mayoría de las variables analizadas, se observó una disminución en función del aumento en la concentración de Si. Por lo tanto, para la micropropagación de fresa 'Jonica', las concentraciones de Si analizadas no mostraron un efecto beneficioso.

Palabras clave


cultivo de tejidos, enraizamiento, medio de cultivo, multiplicación

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Referencias


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