1 Revista Ceres 2012 Vol: 59(6):. DOI: 10.1590/S0034-737X2012000600019

Fertilizantes comerciais e polpa de banana no cultivo in vitro de um híbrido de Phalaenopsis (Orchidaceae)

The in vitro propagation of orchids is a largely used procedure for the production of seedlings. The search for alternative culture media with this purpose has been widely studied due to the complexity of the commonly used media, e.g. the MS medium. The hybrids of Phalaenopsis are among the most commercialized orchids in the world due to the longevity and distinct beauty of its flowers. The objective of this study was to evaluate the effect of commercial fertilizers' formulations and the addition of 'Nanica' banana pulp in a culture medium for in vitro cultivation of a hybrid of Phalaenopsis. Seedlings germinated in vitro, in MS medium, were subcultivated in culture media with a basis of commercial fertilizers and MS medium modified with half the concentration of macronutrients. The culture media were evaluated with and without the addition of the banana pulp (100g L-1) during the stage of maturation 4. The basis of these culture media was composed of sucrose (30g L-1), activated charcoal (1g L-1) and agar (9g L-1). After 180 days the following variables were analyzed: leaf area, number of leaves and roots, root length and dry weight of leaves and roots. We were able to conclude that the treatment composed by Biofert® supplemented with banana pulp presented the best results for the hybrid development in vitro, and actually presented statistically superior results in relation to MS without banana.

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