EFEITO DOS COMPOST OS NA TURAIS BIOA TIVOS NA CONSER VAÇÃO PÓS-COLHEIT A DE FRUT OS DE MANGUEIRA CV . TOMMY ATKINS Effects of bioactive natural compounds on the postharvest conservation of mango fruits cv. Tommy Atkins

2010 
RESUMOA antracnose causa severos danos na pos-colheita de manga. Como o controle quimico tem demonstrado desvantagens, opotencial uso de oleos essenciais para o controle de fitopatogenos tem sido uma alternativa. Neste trabalho, objetvou-se avaliar aeficacia de produtos alternativos no controle da antracnose e na conservacao de mangas (Mangifera indica) cv. Tommy Atkins tratadocom bicarbonato de sodio diluido em agua destilada, na concentracao de 3% (v/v), via imersao. Como tratamento, foram utilizados osoleos essenciais de Origanum majorana, Citrus sinensis, Cymbopogon citratus e Eucalyptus citriodora, via fumigacao, na dosagemde 1000 µL e agua destilada via fumigacao; todos por 3 minutos. Frutos da Unidade CEASA-Maringa/PR, selecionados, pesados embalanca semianalitica, desinfetados em imersao por 3 minutos em solucao de hipoclorito de sodio a 0,5% (v/v); foram submetidos aostratamentos, permanecendo sob condicoes ambientes (26 ± 2oC e UR 90 ± 5%). Exceto o tratamento com Citrus sinensis, queproporcionou um pH maior do que a testemunha, diferindo significativamente dos demais tratamentos que elevaram a variavel. Areducao da acidez em todos os tratamentos e aumentos dos solidos soluveis totais nos frutos, sendo que o tratamento com bicarbonatode sodio proporcionou 14,42 oBrix. O numero de frutos com antracnose foi menor no tratamento com Citrus sinensis e este diferiu dosdemais comprovando o efeito de especies do genero Citrus como antifungicos. O uso de oleos essenciais como o de Citrus sinensiscontrolou a antracnose e manteve a qualidade dos frutos.Termos para indexacao: Mangifera indica, pos-colheita, oleo essencial, antracnose.ABSTRACTThe anthracnose causes severe damages to the mango post-harvest. As chemical control has shown disadvantages, thepotential of use of essential oils has been an alternative for the phytopathogen control. The objective of the present work was toevaluate the efficacy of alternative products in the anthracnose control and in the conservation of mangos (Mangifera mandica) cv.Tommy Atkins treated with sodium bicarbonate diluted in distilled water, concentration of 3% (v/v), through immersion. For thetreatment, the essential oils of Origanum majorana, Citrus sinensis, Cymbopogon citratus and Eucalyptus citriodora were usedthrough fumigation, in the dosage of 1000 µL and distilled water through fumigation; all for 3 minutes. Mango fruits of the UnityCEASA-Maringa/PR, selected, weighed in a semi-analytical scale, disinfected by immersion of 3 minutes in a solution of sodiumhypochlorite to 0.5% (v/v); rinsed in running water and dried. They were submitted to the treatments under ambient conditions (26± 2oC and RH 90 ± 5%). Except for the treatment of Citrus sinensis, that resulted in a pH larger than the witness, significantlydiffering from the treatments that elevate the variable. There was reduction of the acidity in all of the treatments and increment of TSSin the fruits and with sodium bicarbonate provided 14.42 o Brix. The number of fruits with anthracnose was smaller in those treatedwith Citrus sinensis and this differed from the others, proving the effect of Citrus as fungitoxic. The use of essential oils such as thatobtained from Citrus sinensis controlled the anthracnose and maintained the quality of the fruits.Index terms: Mangifera indica, postharvest, essential oil, anthracnose.
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