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O objetivo do trabalho foi avaliar o efeito do 1-MCP na firmeza de mangas ´Palmer', armazenadas sob refrigeração. As mangas foram tratadas com 1-MCP nas concentrações de 0, 100 e 150nL.L-1, durante 12 horas à 22ºC. Em seguida, foram armazenadas em câmara fria a 10 ± 1ºC e 80 a 90% de UR, por um período de 35 dias. A cada 7 dias foram retirados 6 frutos de cada tratamento para as seguintes avaliações: firmeza, pectina total, percentagem de solubilização de pectinas, atividade da pectinametilesterase, poligalacturonase e â-D-galactosidase. O tratamento com 1-MCP, associado à refrigeração mostrou ser eficiente em prolongar a vida útil dos frutos. Os frutos tratados com 150nL.L-1 apresentaram menor percentagem de solubilização de pectina e mais firmes no final do armazenamento, quando comparados aos outros tratamentos. Após 35 dias de armazenamento refrigerado, todos os frutos estavam aptos para o consumo, indicando que outros estudos deverão ser realizados aumentando o tempo de armazenamento. The objective of this work was to evaluate the effect of the 1-MCP in the firmness of mangos ´Palmer' stored under refrigeration. The mangos were treated with 1-MCP in concentrations of 0, 100 and 150nL.L-1, during 12 hours at the 22ºC. Soon after, they were stored in a cold chamber (10 ± 1ºC and 80 to 90% of UR), for a period of 35 days. Every 7 days were retired 6 fruits of each treatment for to the following evaluations: firmness, total pectin, percentage of solubilization of pectins, activity of the pectinmethylesterase, polygalacturonase and â-D-galactosidase activities. The treatment with 1-MCP, associated to the refrigeration showed to be efficient in prolonging the useful life of the fruits. The treated fruits with 150nL.L-1 presented smaller percentage of pectin solubilization and firmness in the end of the storage, when compared to the other treatments. After 35 days of refrigerated storage, all the fruits were capable for the consumption, indicating that other studies should be accomplished increasing the time of storage

Firmeza de mangas 'Palmer' tratadas com 1-metilciclopropeno e armazenadas sob refrigeração