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Previous issue date: 2010-02-26 === Funda??o Carlos Chagas Filho de Amparo ? Pesquisa do Estado do RJ, FAPERJ, Brasil. === The experiment was conducted at the Postharvest Laboratory of UFRRJ, aiming to observe the effects of competition of the processes of irradiation and climatization sequences, on the maturation of banana 'Prata' and 'Prata an??. For the treatments, the fruits were separated into two lots. The first batch was taken to Centro Tecnol?gico do Ex?rcito (CTEx), in Rio de Janeiro, to receive doses of 0.25 kGy and 0.50 kGy in irradiator with a source of 137Cs. The second batch remained in the Postharvest Laboratory, and were underwent to exposure of calcium carbide in a dose of 7 g m-?. Part of the first batch returned to the Laboratory, being exposed under the same conditions and doses of calcium carbide. In the same manner described above, part of the second batch was taken to CTEx for exposure to the same doses of gamma radiation from the first batch. Two experiments were conducted separately. In both experiments, we evaluated the skin color, index of diseases, weight loss, firmness, peel chlorophyll, acidity, starch, soluble solids, enzymatic activity (pectinmetilesterase) and respiratory activity. In the first experiment, fruits of banana 'Prata' underwent a randomized design in factorial 8x5, except for evaluations of starch and pectinmetilesterase (8x3) and firmness (8x2). The average temperature of storage was 27 ? C. In experiment two, fruits of banana 'Prata-dwarf "were also subjected to completely randomized design with 8x5 factorial design (skin color, index and weight loss) and 8x3 for the other variables. The average temperature of storage was 23 ? C. In Experiments 1 and 2 for respiratory activity, we used a split plot design in time, with six replicates. Under the conditions of this study, the fruits obtained in the region of Angra dos Reis, Rio de Janeiro showed no positive responses in terms of quality with the application of irradiation, suggesting that the inappropriate handling of the fruits in the field, significantly influenced the results in post-harvest when the irradiation was used as a process to increase their useful life. The sequence of processes used, climatization and irradiation, regardless of the order, did not show different effects, since the fruits of both cultivars showed similar behavior during storage. More evident for the banana ?Prata-an??, treatment with gamma radiation at 0.25 kGy dose alone was effective in slowing the processes that lead to maturity === O experimento foi conduzido no Laborat?rio de P?s-Colheita da UFRRJ, com os objetivos de observar os efeitos da competi??o dos processos de irradia??o e climatiza??o seq?enciais, sobre a matura??o banana ?Prata? e ?Prata-an?. Para aplica??o dos tratamentos, os frutos foram separados em dois lotes. O 1? lote foi levado ao Centro Tecnol?gico do Ex?rcito no RJ (CTEx) para receber as doses de 0,25 kGy e 0,50 kGy em irradiador com fonte de 137Cs. O 2? lote permaneceu no Laborat?rio de P?s-Colheita, no qual foram submetidos ? exposi??o do carbureto de c?lcio na dose de 7 g m-?. Parte do 1? lote retornou ao Laborat?rio de P?s-Colheita, sendo exposta, nas mesmas condi??es e doses do carbureto de c?lcio. Da mesma forma descrita anteriormente, parte do 2? lote foi levado ao CTEx para exposi??o ?s mesmas doses de radia??o gama do 1? lote. Foram realizados dois experimentos separadamente. Nos dois experimentos, avaliou-se a colora??o da casca, ?ndice de doen?as, perda de massa fresca, firmeza, clorofila total da casca, acidez titul?vel, amido, s?lidos sol?veis totais, atividade enzim?tica (pectinametilesterase) e atividade respirat?ria. No experimento 1, frutos de banana ?Prata? foram submetidos a um delineamento inteiramente casualizado, em esquema fatorial 8x5, exceto para as avalia??es de amido e pectinametilesterase (8x3) e firmeza (8x2). A temperatura m?dia de armazenamento foi de 27? C. No experimento 2, frutos de banana ?Prata-an?? tamb?m foram submetidos ao delineamento inteiramente casualizado com esquema fatorial 8x5 (cor casca, ?ndice de doen?as e perda de massa fresca) e 8x3 para as demais vari?veis. A temperatura m?dia de armazenamento foi de 23? C. Nos experimentos 1 e 2, para a atividade respirat?ria, utilizou-se esquema de parcela subdividida no tempo, com 6 repeti??es. Nas condi??es do presente trabalho os frutos obtidos na regi?o de Angra dos Reis/RJ n?o apresentaram respostas positivas em termos de qualidade com a aplica??o da irradia??o, denotando que o manejo inadequado dos frutos em campo, influenciou significativamente nos resultados em p?s-colheita quando a irradia??o foi utilizada como processo para aumentar a vida ?til dos mesmos. A sequ?ncia dos processos utilizados, climatiza??o e irradia??o, independente da ordem, n?o apresentou efeitos diferenciados, uma vez que, os frutos, de ambas as cultivares, apresentaram comportamento semelhante durante o armazenamento. De forma mais evidente para a banana ?Prata-an??, o tratamento com radia??o gama na dose 0,25 kGy isolada foi eficiente em retardar os processos que levam ao amadurecimento.
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