Cultura in vitro de meristemas de batata-doce (Ipomoea batatas (L.) Lam.)

In vitro sweet potato (Ipomoea batatas (L.) Lam.) was evaluated as to its ability to regenerate into plantlets and micropropagation. Apical meristems were inoculated on MS medium supplemented altematively with ANA + BAP; ANA + KIN + GA3; and ANA + BAP + GA3. The cultivars RC 1.8, MFT (Mãe-de-Família També), TR 3, 473 and Arroba led plantlets with similar height but different regeneration ratio. The supplementation with 0.01 mg/l of ANA plus 1.0 mg/l of BAP was indicated for Arroba and MFT; however, for TR 3,473 and RC 1.8, the supplementation with 0.005 mg/l ANA + 0.5 mg/l BAP + 0.25 mg/l AG3 was recommended. Plantlets were propagated through nodal segments using MS medium with 1.0 mg/l of GA3. Differences between cultivars were not observed.Cultivares de batata-doce (Ipomoea batatas (L.) Lam.) foram avaliadas in vitro em relação a sua capacidade de regeneração de plântulas a partir de ápices caulinares e micropropagação. Os ápices caulinares foram inoculados no meio MS suplementado com ANA + BAP + KIN + AG3 e ANA + BAP + AG3. As cultivares RC 1.8, MFT (Mãe-de-Família També), TR 3, 473 e Arroba produziram plântulas de alturas similares, porém com diferentes taxas de regeneração. A suplementação com 0,0 1 mg/l de ANA + 1,0 mg/l de BAP foi a mais recomendável. A micropropagação dessas plântulas, através de segmentos nodais inoculados em meio MS contendo 1,0 mg/l de AG3 não mostrou diferenças entre as cultivares