RESUMO -O uso da micropropagação na produção de mudas constitui-se em técnica de multiplicação importante, embora não seja usual para citros, cujos porta-enxertos são obtidos por sementes. Entretanto, pode ser alternativa viável quando a demanda por material propagativo for superior em relação à oferta de sementes. Buscou-se micropropagar o citrumelo 'Swingle' através de gemas axilares, excisadas de plantas cultivadas em meio MT, seis semanas após a semeadura e submetidas a combinações de 6-benzilaminapurina (BAP) (0,0; 0,5; 1,0 e 1,5 mg L -1 ) e ácido naftaleno acético (ANA) (0,0 e 0,5 mg L -1 ). As brotações foram enraizadas em meio RMAN para posterior aclimatização. O número de brotações induzidas foi afetado apenas pelas concentrações de BAP. Melhor desenvolvimento vegetativo foi alcançado em brotações advindas dos tratamentos com as menores concentrações de reguladores. Termos para indexação: citros, porta-enxerto, multiplicação de brotos, cultura de tecidos. MICROPROPAGATION OF 'SWINGLE' CITRUMELO THROUGH AXILARY BUDS IN VITRO CULTUREABSTRACT -The use of micropropagation to nursery tree production is considered an important technique of propagation, although it is not usual in citrus industry, where rootstocks are produced by seedlings. However, it might be a viable alternative when the demand for nursery material is higher than seed availability. This work aimed to micropropagate 'Swingle' citrumelo through axilary buds, excised from in vitro seedlings cultivated in MT medium, six weeks after seed incubation, and submitted to combinations of BAP -6-benzilaminapurine (0,0; 0,5; 1,0 e 1,5 mg L -1 ) and NAAnaftalene acetic acid (0,0 e 0,5 mg L -1 ). Shoots were rooted in RMAN medium and then acclimated. The number of induced shoots was affected by concentrations of BAP. The best vegetative development of the acclimated plants was accomplished in shoots from treatments with lower growth regulator concentrations.
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