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Gmelina arborea (melina), an introduced tree species in Colombia, is planted in areas of the north coast of Colombia which is characterized by long, dry seasons with low soil water availability, limiting primary productivity. In order to assign the best planting materials to specific ecophysiological conditions, progress has been made in genetic improvement, confirming whether the physiological responses to water stress are an appropriate parameter to select clones tolerant to the low water availability. This study was conducted under greenhouse conditions in the municipality of Zambrano (Bolivar), and evaluated the response of 27 clones of G. Arborea to soil moisture tension, using field capacity (FC) and permanent wilting point (PWP) as criteria for the assignment of clones to potential planting sites. The 27 clones, from the Pizano SA collection, were planted in cylindrical blocks of undisturbed soil at nine points taken from different units of the soil series mapping of the Zambrano region. PWP was found to range between -4.8 and -9.0 bar. In 17 clones, PWP values were not affected by the physicochemical properties of the soil, while the remaining 10 PWP values appeared to be associated with these properties. Of these 10, an analysis of the variance components indicates that five of the ten clones show intraclonal variation attributed to topophysis. The results confirm the possibility of using PWP as a criterion for assigning clones to potential sites for the commercial cultivation of melina.

ciencia y tecnología agropecuaria

El punto de marchitez permanente (PMP) en melina (Gmelina arborea L. Roxb) para la Costa Caribe colombiana ¿una característica para la selección de clones?