Comparison of morphological and chemical fruit traits from different pitaya genotypes (<em>Hylocereus</em> sp.) grown in Costa Rica
AbstractPhysico-chemical parameters of the fruits of five Hylocereus genotypes grown in their natural habitat in Costa Rica were determined and their morphological traits were assessed. Besides, overall dimensions, shape, weight, flesh fraction, skin thickness, seed content and juice yield were recorded. Chemical analyses comprised pH, total soluble solids, titratable acidity, proline and pectin content, formol number and density of the juices. In addition, the major sugars glucose, fructose and sucrose, as well as organic acids were quantified by HPLC. Moreover, skin and flesh firmness were assessed. Significant differences were observed between genotypes concerning fruit weight and dimensions, skin thickness, proportion of flesh and amount of seeds. Whereas lowest pH values were determined in the juices from ‘San Ignacio’, highest malic acid contents in ‘Rosa’ and maximal total soluble solids were found in juices from ‘Nacional’ fruits. Furthermore, differences between genotypes concerning density, pectin and glucose contents of the juices were noted.
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