Active charcoal has the capacity to fix phenolic compounds released by the oxidation of manipulated tissues during in vitro cultivation. The present work objective was to evaluate the interaction effects between active charcoal, combined to different BAP concentrations in the in vitro banana propagation, cv. Grand Nain (AAA). The culture medium used was the MS, solidified with 5 g.L-1 agar. Cultures were kept in a growth room at 25 ± 2ºC with a photoperiod of 16 h at 30 mmol.m-2s-1. It was evaluated the presence and the absence of active charcoal (0 and 3 g.L-1) and different concentrations of BAP (0, 2, 4 and 6 mg.L-1) in the culture medium of four subcultures at four-week intervals. The experimental design was completely randomized in a 2x4 factorial scheme, and five replicas. After each subculture shoot height, multiplication rate, vigor, oxidation level and number of roots per shoot were evaluated. Independently of BAP concentrations, active charcoal had influenced significantly on the results. In general, the addition of active charcoal affected negatively the multiplication rate, while it improved the vigor, root number and decreased the oxidation level of the shoots. In the absence of activated charcoal, BAP provided larger multiplication rates of shoots.
Musa sp.; micropropagation; phenolic compounds; oxidation; citokinin
