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O presente trabalho foi realizado no Laboratório de Cultura de Tecidos da EMBRAPA/CPACT, Pelotas-RS, com o objetivo de verificar o comportamento in vitro de duas cultivares de morangueiro em diferentes concentrações do meio MS. Explantes de morangueiro, cultivares Hofla e Tangi provenientes do cultivo in vitro foram cultivados em meio MS, na concentração plena, 3/4 e 1/2 adicionado de sacarose a 30g/l, mio-inositol a 100mg/l e benzilaminopurina (BAP) a 0,005mg/l. Utilizaram-se frascos com capacidade de 250ml, que continham 40ml de meio de cultura, nos quais inocularam-se cinco explantes. O cultivo foi mantido em sala de cultura, onde permaneceu por 32 dias sob fotoperíodo de 16 horas, luminância de 1500 lux e temperatura de 25°C. Os resultados indicaram que a redução na concentração dos sais MS incrementa o percentual de explantes enraizados, aumentando o número de raízes da cultivar Tangi. O maior comprimento médio de raízes foi obtido com a cultivar Hofla na concentração 3/4 e 1/2 do meio MS. Não se observaram diferenças no desenvolvimento das plântulas, entre as cultivares, com a redução das concentrações do meio MS. The present work was carried out in the Tissue Culture Laboratory EMBRAPA/CPACT, Pelotas-RS, with the objective of verifying the behaviour in vitro of two cultivars of strawberry on different MS medium concentration. Strawberry explants, Hofla and Tangi cultivars coming from in vitro culture were tested on MS medium in the full, 3/4 and 1/2 strength suplemented with 30g/l sucrose, 100mg/l myo-inositol and 0.005mg/l benzylanimopurine (BA). Flasks (250ml) containing 40ml of medium culture with five explants per flasks were used. Cultures were maintained in a growth room at 25°C with a photoperiod of 16 h at 1.5 Klux for 32 days. Results indicated that the reduction in MS salts improved rooting explant by increasing the number of roots of the Tangi cultivar. A large root length was obtained with the Hofla cultivar in the 3/4 and 1/2 MS concentration. It was not observed any difference in the development of the plantlets among the cultivars due to the reduction in MS salts

Enraizamento in vitro do morangueiro (Fragaria x ananassa Duchesne) em diferentes concentrações do meio MS