Resumen
Alpinia purpurata es una planta ornamental nativa de las islas del Pacífico asiático con potencial por su inflorescencia roja, adaptada a las condiciones de la costa Atlántica colombiana; sin embargo, la falta de protocolos de propagación, evita su cultivo comercialmente. Con el interés ajustar un protocolo de micropropagación para la producción clonal de material de siembra, el presente estudio tuvo como objetivo, evaluar el efecto de la sacarosa y el ácido giberélico (GA3) en el medio de cultivo, sobre el número de nuevos brotes por explante, longitud de brotes, número de raíces, longitud de raíces y número de hojas. Los explantes fueron cultivados en medio semisólido ms (Murashige & Skoog, 1962) suplido con sacarosa (30, 45 y 60 mg/L) y combinados con GA3 (0,0; 0,25; 0,5; 0,75 y 1,0 mg/L). Se empleó un arreglo factorial con dos factores, 15 tratamientos y 10 repeticiones por tratamiento, para un total de 150 unidades experimentales distribuidas en un diseño completamente al azar. Los cultivos fueron almacenados cinco semanas a 25 °C con 12 h de fotoperíodo (40 μmol m-2 s-1). El Anova y la prueba de Tukey permitieron detectar que la sacarosa y GA3 afectaron significativamente todas las variables: el incremento en la concentración de sacarosa indujo mayor número de brotes, y los brotes en presencia de GA3 tuvieron una mayor longitud. Se observó una tendencia a disminuir la longitud de las raíces y el número de hojas en la medida en que se aumentó la dosis de sacarosa y GA3.
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