Resumo -Foram testados os efeitos de diferentes concentrações de sacarose sobre a taxa multiplicativa de brotos in vitro e sobre a anatomia dos órgãos vegetativos de plântulas de macieira. A micropropagação foi obtida por organogênese direta a partir de ápices caulinares e segmentos internodais. Na análise estrutural, utilizou-se plântula desenvolvida em meio MS após 30 dias de cultura. A ausência de sacarose no meio de cultura ocasionou a morte ou atrofiamento do explante. A maior taxa de brotos foi obtida com os explantes de ápices caulinares, e o tamanho médio dos brotos, nas concentrações 30, 45 e 60 g L -1, variou entre 1 e 3 cm. A folha apresentou alterações estruturais de acordo com as concentrações de sacarose do meio.Termos para indexação: Malus domestica, cultura in vitro, anatomia.
In vitro propagation and structural analysis of apple treeAbstract -Effects of different concentrations of saccharose on multiplicative rates of in vitro sprouts and on anatomy of vegetative organs of young apple plants were tested. The micropropagation was obtained by direct organogenesis starting from stem apexes and internodal segments. Explants were removed from young plants, germinated in vitro at two months age. For the anatomical analysis of vegetative organs, plantlets developped in M&S medium after 30 days of culture were used. Results showed that the medium without sucrose caused death of the explant. The highest rate of shoots appeared using explants of stem apexes, and the size of the shoots in the concentrations 30, 45 and 60 g L -1 varied between 1 and 3 cm. The leaf presents structural alterations according to the medium sucrose concentration.
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