Gisele Polete Mizobutsi

Efeito da aplicação de cianamida hidrogenada e de óleo mineral em caquizeiro

This study was conducted in 1994 at the Experiment Station of Araponga, Minas Gerais, located in a region of Cwa - climate. The objective was to determine the effect of application of 7,8 g. i.a.L-1 hydrogen cyanamide plus 8,0 mL.L-1 mineral oil on persimmon trees cv. Rubi, and the effect of application dates (6/9, 6/30, 7/21, 8/11/1994). All the treatments using hydrogen cyanamide plus mineral oil promoted earlier bud burst, flowering and harvesting compared to the control, permiting fruit harvesting begining in december. The content of soluble solids and titratable acidity and fruit set increased with the application of hydrogen cyanamide plus mineral oil in 6/9. There was no significant difference for flesh firmness and average fruit weight.

The chitosan affects severely the carbon metabolism in mango (Mangifera indica L. cv. Palmer) fruit during storage

Mango is a highly perishable fruit with a short post-harvest time due to the intense metabolic activity after harvesting. In attempt to evaluate the effects of chitosan in mango fruits, it was treated with 0%, 1%, 2% or 3% of chitosan solutions, placed into plastic trays, and stored at room temperature. Changes in physical and chemical parameters were evaluated. Chitosan delayed the climacteric peak, water loss and firmness. Further, few changes in soluble solid content, titratable acidity, pH of the pulp as well as in sugar content and decreased starch degradation were observed. Altogether, our results suggest chitosan edible coating effectively prolongs the quality attributes, affecting basic mitochondrial respiration and starch degradation rate.

Conservação de pinha com uso de atmosfera modificada e refrigeração

Os frutos da pinheira possuem limitacoes para sua distribuicao a mercados distantes, por causa do rapido amadurecimento, que os torna muito macios, de dificil manuseio sem a ocorrencia de danos e de conservacao extremamente reduzida. O objetivo deste trabalho foi avaliar a influencia do filme de policloreto de vinila (PVC), associado as temperaturas de refrigeracao, na conservacao pos-colheita da pinha. Os frutos foram selecionados, lavados, sanitizados e acondicionados em bandejas de isopor, com, ou sem, envolvimento de pelicula de policloreto de vinila, e conservados a 12 e 25 oC. Foram avaliados: cor da casca, firmeza, perda de materia fresca, solidos soluveis, acidez titulavel, acucares totais e amido. Os frutos conservados a 12 oC, com policloreto de vinila, mantiveram a coloracao verde da casca ate o 18o dia, apresentaram menor perda de massa de materia fresca e firmeza da casca e menor teor de solidos soluveis e acidez titulavel, em relacao aos frutos armazenados a 25 oC. A utilizacao da embalagem, associada a temperatura de 12 oC, permite um periodo seguro de 18 dias de conservacao, com adequada manutencao dos atributos fisicos e quimicos. Os frutos armazenados a 25 oC conservaram-se por seis dias. A pelicula de PVC, associada ao armazenamento de 12 oC, pode ser utilizada para atrasar o amadurecimento dos frutos por 18 dias, mantendo sua qualidade. Os frutos que permaneceram armazenados, por seis dias, a 25 oC com, ou sem, PVC, nao apresentaram caracteristicas fisicas e quimicas desejaveis.

Conservação pós-colheita de mamão formosa com filme de pvc e refrigeração

The objective of this work was to increase post-harvest preservation of papaya fruit maintaining its quality with use of PVC film and refrigerated temperature. It was used papayas from the group Formosa, Tainung 01. The temperature of cooling used was 10 o C and relative humidity of 90%. The ambience temperature was 25 o C (+ / - 1) with relative humidity around 60%. The experimental design was randomized blocks. The lowest percentages of fresh mass loss were observed in the treatment with PVC at 10oC. The refrigeration use at 10 oC had higher firmness, lower levels of total soluble solids and growing increase of SST ATT-1 until the 6th day of storage, with next phase of stabilization. The storage of papaya Formosa under refrigeration associated with modified atmosphere with PVC film was more efficient in maintaining the quality of the fruit.

AVALIAÇÃO DE GENÓTIPOS DE BANANEIRA À Colletotrichum musae EM PÓS-COLHEITA 1

Some tetraploides hybrids present resistance to anthracnose, however the information on the levels of resistance of these genotypes and the behavior in Brazil are reduced. The aim of this study was to evaluate the incidence and severity of injury on the behavior of different banana genotypes resistant to Black Sigatoka for different concentrations of conidia of Colletotrichum musae in different times of evaluation. The fruits of the genotypes, Thap Maeo, Caipira, Pacovan Ken, Ambrosia, PV 42-53, PA 42-44, FHIA 01, FHIA 18 and cultivar Prata Ana, were collected at the stage of physiological maturation. Bunches containing three fruits were atomized with different concentrations: 0, 102, 103, 104, 105 and 106 conidia/mL of C. musae. The fruits were incubated at 25 oC. The incidence and severity of the anthracnose were evaluated 3, 6, 9 and 12 days after the inoculation. A completely randomized experimental design was used, in a factorial scheme 9x6x4 (genotypes, concentrations of spores and evaluation periods) with four replications containing four bunches of three fruits. After twelve days of evaluation all the fruits of all the studied genotypes presented incidence of C. musae when different concentrations of inoculum were used. Concerning the severity of the anthracnose, the cultivar Thap Maeo had the lowest severity (27,5%) of anthracnose while the genotypes Ambrosia, PV 42-53, FHIA 18 and FHIA 01 were the most susceptible to the anthracnose at 64%, 64%, 61,33%, 58% of severity, respectively.