Abstract

HERNANDEZ, Jaime L. et al. YIELD AND QUALITY OF LEAVES OF Stevia rebaudiana Bert. UNDER PEDOLOGICAL OFFER AND TWO LEVELS OF RADIATION IN FIVE COLOMBIAN REGIONS. rev.udcaactual.divulg.cient. [online]. 2016, vol.19, n.1, pp.77-85. ISSN 0123-4226.

The current use at industrial-scale of stevia has increased in the world, context that emphasizes the interest to search best areas for planting the crop in many regions of the country. The objective of this work was to analyze the yield stability and content of steviol glycosides of Stevia rebaudiana Bert. in function of light offer in five regions of Colombia. Five experimental plots of the cultivar Morita II were selected, located in Monteria-Cordoba; Campamento - Antioquia; Palmira - Valle del Cauca; Fonseca - Guajira and Valledupar - Cesar, under a complete random block design with two treatments, diffuse and direct radiation, with five replicates for each locality. The content of stevioside (Stv), rebaudioside A (RebA), main glycosides (GP) in mg.kg^-1 of dry leaf, with a liquid chromatography of high-efficacy and the relationship Reba/Stv and yield in kg.ha^-1 of dry leaf was quantified. Data were analyzed through analysis of variance and Duncan's mean comparison test (α=0.05). The analysis of variance indicated that radiation levels did not affect the synthesis of Stv and RebA and no interaction between radiation levels by locality was detected. Significant differences in the content of Stv, RebA and relation RebA/Stv between the localities were determined. At Palmira, with 132.26mg.kg^-1 the highest content of RebA was recorded, while the major relationship RebA/Stv, which defines the leaf quality, of 10:1mg.g^-1 was obtained at Monteria.

Keywords : Diterpene glycosides; stevioside; rebaudioside A; genotype environment interaction; photosynthetically active radiation.

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