RESUMO -A suscetibilidade a doenças de grande impacto econômico põe em risco a viabilidade econômica da bananicultura. A melhor estratégia para controle destas doenças, do ponto de vista econômico e ambiental, é a utilização de cultivares resistentes. Porém, estas devem apresentar, além de boas características de produtividade, um bom sabor e facilidade para manuseio e transporte como requisitos para aceitação do mercado. Portanto, este trabalho visou a avaliar características pós-colheita do genótipo PA42-44 resistente ao mal-do-panamá, sigatoka-amarela e negra, comparando à cultivar 'Prata-Anã', bastante difundida, porém suscetível às doenças citadas. Para tal, bananas de cada um dos genótipos foram colhidas e armazenadas à temperatura de 22 ± 1°C e umidade relativa de 75 ± 5% até atingirem determinado índice de coloração para avaliação. As bananas foram avaliadas nos índices de coloração 2; 3; 4; 5 e 6, segundo a escala de notas de Von Loesecke. As variáveis avaliadas foram: firmeza, pH, acidez titulável (AT), sólidos solúveis (SS), relação SS/AT e despencamento. Também foi verificado qual dos genótipos amadurece mais rapidamente, analisando a modificação da cor das bananas por 12 dias. Finalmente, foi realizada a análise sensorial para os atributos aparência, aceitabilidade, firmeza e doçura de ambos os genótipos. As bananas PA42-44, quando comparadas à 'Prata-Anã', nos mesmos índices de coloração, encontravam-se em processo mais avançado de amadurecimento. Porém, quando avaliadas em função do período de armazenamento, a 'Prata-Anã' amadureceu mais rapidamente. As bananas PA42-44 são menos firmes e bem mais suscetíveis ao despencamento que as bananas 'Prata-Anã'. Já as características sensoriais dos genótipos foram iguais quanto à preferência. Termos para indexação: armazenamento, conservação, análise sensorial, despencamento. POST-HARVEST QUALITY OF GENOTYPES OF BANANA 'PA 42-44' AND 'PRATA ANÃ' CULTIVATED IN THE NORTH OF MINAS GERAISABSTRACT -The production of bananas will always be threatened by diseases of great economical impact that can unable production. The best strategy to control these diseases, economically and environmentally, is the utilization of resistant materials. However, these must have more than good production characteristics; they should have attractive flavor and easiness in handling and transportation as requisites for market acceptance. Therefore, the objective of this work was the evaluation of post harvest characteristics of the disease resistant genotype PA 42-44 comparing with the 'Prata-Anã' variety commercially accepted, but susceptible to diseases. For that matter, bananas of each genotype were harvested and stored at 22 ± 1°C temperature and 75 ± 5% relative humidity, until they reached the pre-determined color index for evaluation. The bananas were evaluated at the color indexes of 2, 3, 4, 5 and 6 according to the Von Loesecke scale. The variables analyzed were: firmness, pH, titratable acidity (TA), soluble solids (SS), relation SS/ TA and finger detachment. It was also st...

The change of grape (Vitis vinifera) harvest from summer to winter through double pruning management has improved the fine wine quality in southern Brazil. High altitude, late cultivar and grafting combination all need to be investigated to optimize this new viticulture management. For this purpose, this study was carried out during the 2011 and 2012 growing seasons in a high altitude region of the state of Minas Gerais, Brazil, using eight grafting combinations for five year old Cabernet Sauvignon vines. The stem water potential, photosynthetic rate and stomatal conductance were not affected by rootstock type. The rootstocks IAC 766 and 101-14 induced, respectively, the highest and lowest vegetative vigor in Cabernet Sauvignon, as shown by leaf area and pruning weight. In the 2011 growing season, the leaf chlorophyll contents were increased in IAC 766, whereas vines grafted onto 101-14 accumulated more leaf starch, probably due to reduced vegetative and reproductive growth. In general, rootstocks K5BB, 1045P, SO4 and IAC 766 had the highest yield as compared to 1103P and 101-14. Berries from the grapevine with the highest yield did not differ in pH, total soluble solids and acidity. The rootstocks did not influence the anthocyanins and total phenols in both growing seasons. Quality parameters were better in the 2011 than in the 2012 growing season due to better climatic conditions, mainly less rainfall. The best performance of Cabernet Sauvignon was achieved when grafted onto K5BB, 1045P, SO4 and IAC 766 rootstocks. Keywords: double pruning, leaf carbohydrates, vegetative vigor, grape composition IntroductionThe southeastern region of Brazil has shown potential for the production of high quality wines during the winter growing season through double pruning management. This technique has improved grape (Vitis vinifera) quality by changing the period of harvest from wet and warm summer to dry and mild autumn -winter . To harvest wine grapes during the autumn -winter, the first pruning takes place in August and the second in January .The first studies carried out in the state of Minas Gerais showed that the ecological conditions of the autumn-winter season, such as low rainfall and high thermal amplitude, are favorable for improving Syrah grape composition from grapevines grown under warm temperate and tropical (Favero et al., 2010) climates in the south and north of the state, respectively. However, double pruning management had not been validated either for high altitude, or for late maturing cultivars, such as Cabernet Sauvignon. Furthermore, the rootstock effects also needed to be investigated to optimize the effects of double pruning management.In viticulture, rootstocks are widely used and make a significant contribution to scion performance under several cultivation conditions. Although the mechanism for grapevine scion vigor controlled by rootstocks is poorly understood, several authors have shown effects on water relations (Souza et al., 2009) ). Therefore, the selection of an appropriate roots...

In the Brazilian Southeast, the production of high quality wines is attained by a new management approach called double pruning. This management changes the harvesting of wine grape (Vitis vinifera L.) from wet summer to dry winter through a two pruning procedures carried out during the year. The first pruning is done during the winter to induce a vegetative cycle (all clusters are removed) and a second pruning is done during the summer to induce the reproductive cycle. In this study, ten different rootstocks were compared in order to optimize yield and wine quality of Syrah vines conducted under autumn-winter season by double pruning approach. Syrah grapevines grafted onto 'Rupestris du Lot' and 'IAC 766' showed the highest pruning weight, while '110 Richter' and '161-49 Courdec' induced the lowest cane vigor. The average production of two seasons identified 'IAC 766', 'Kober 5BB' and 'Rupestris du Lot' as the most productive rootstocks. In both seasons, the grape quality was more influenced by the plant development status than by rootstocks. 'Syrah' wine from vigorous and high yielding rootstocks, 'IAC 766' and 'Rupestris du Lot', showed satisfactory wine phenolic composition and alcohol/ acidity balance. This study showed that vigorous rootstock increased yield without compromising grape and winter wine quality of Syrah grapevines subjected to double pruning management in the Brazilian Southeast.

Papaya is a fragile, perishable fruit, highly accepted worldwide. To keep the quality of papaya from harvest to the consumers, conservation techniques are often used; among them is the application of gamma irradiation. The objective of this work was to evaluate gamma irradiation in papayas harvested at three degrees of maturation, in order to increase shelf life. Papayas were harvested in perfect quality conditions and selected by skin coloration into three distinct degrees of maturation: maturation 0, or beginning of yellow coloration; maturation 1, yellow stripes more developed, and maturation 2, one third yellow. Half of them were irradiated with 0.75 kGy, while the other half became control treatment. They were analyzed in four periods of conservation, which were 1 DAI (days after irradiation refrigerated at 11 ± 1°C), 14 DAI, 14 DAI + 3 DRT (room temperature at 24° ± 2°C) and 14 DAI + 6 DRT. The papaya maturation degree at harvest did not influence the radiation effect. Irradiation maintained firmness of papaya and, therefore, delayed ripening; modified the green color of papaya to a lighter, more intense tone, which determined more homogeneity in the development of the skin's yellow color (greater values of L* and croma). There was no effect of irradiation in papaya weight loss, occurrence of diseases, croma of flesh color, pH and total soluble solids contents. Key words: post-harvest, food conservation, gamma irradiation, tropical fruits, shelf life RADIAÇÃO GAMA EM MAMÃO PAPAIA COLHIDO EM TRÊS ESTÁDIOS DE MATURAÇÃORESUMO: O mamão é um fruto frágil, perecível, muito apreciado mundialmente. Para que a qualidade do mamão se mantenha da colheita até os consumidores, técnicas de conservação são utilizadas, sendo uma destas a aplicação de radiação gama. O objetivo deste trabalho foi avaliar a aplicação de irradiação gama em mamões colhidos em diferentes estádios de maturação com a intenção de aumentar a vida útil pós-colheita. Mamões foram colhidos em perfeitas condições de qualidade e selecionados pela coloração amarela em três fases distintas: maturação 0, ou início da coloração amarela; maturação 1, com estrias amarelas mais desenvolvidas, e maturação 2, com um terço da casca já amarelo. Metade destes foi irradiada com 0,75 kGy e a outra se tornou testemunhas. A análise se deu em quatro períodos de conservação sendo estes 1 DAI (dias após a irradiação sob refrigeração a 11 ± 1°C), 14 DAI, 14 DAI + 3 DTA (dias a temperatura ambiente a 24°± 2°C) e 14 DAI + 6 DTA. Não houve diferença entre os mamões irradiados em diferentes estádios de maturação. A irradiação promoveu manutenção da firmeza do mamão e, portanto, retardo no amadurecimento; modificou a cor verde do mamão para tons mais claros e mais intensos o que determinou maior homogeneidade no desenvolvimento da cor amarela da casca (valores de brilho e croma maiores). Não houve efeito da irradiação na perda de massa, aparecimento de doenças, na cor interna dos frutos, no pH e no teor de sólidos solúveis. Palavras-chave: pós-colheita, conservação de...

Resumo -O objetivo deste trabalho foi avaliar a influência de porta-enxertos sobre as características agronômicas, ecofisiológicas e qualitativas da videira 'Syrah' manejada por meio da técnica da dupla poda. As videiras foram enxertadas nos porta-enxertos 'SO4', '110 Richter' e '1103 Paulsen', e sustentadas em sistema espaldeira sem irrigação. Foram avaliadas as características ecofisiológicas, de produção e de composição físico-química das bagas maduras em três safras (2007, 2008 e 2010). Os porta-enxertos não exerceram influência sobre o potencial hídrico de base, que apresentou valores próximos a -0,2 MPa, o que indica que não houve restrição hídrica no solo ao final da maturação (junho). Também não houve diferença significativa quanto à produção. O porta-enxerto '1103 Paulsen' conferiu menor vigor, menor taxa fotossintética e melhores resultados de maturação, para as safras com menores precipitações. Os porta-enxertos '110 Richter' e 'SO4' apresentaram maior vigor nas condições meteorológicas de 2010 e as maiores taxas fotossintéticas para o mesmo período. As condições meteorológicas tiveram efeito significativo na maturação tecnológica e fenólica, com os melhores resultados para os anos mais secos. O porta-enxerto '1103 Paulsen' fornece melhor equilíbrio entre vigor e produção, o que aumenta a qualidade da uva.Termos para indexação: Vitis vinifera, ácidos orgânicos, açúcares redutores, compostos fenólicos, manejo, produção. 'Syrah' vine on different rootstocks in winter cycle in the south of Minas Gerais State, BrazilAbstract -The objective of this work was to evaluate rootstock influence on agronomical, ecophysiological and qualitative characteristics of 'Syrah' vines managed by double pruning. Grapevines were grafted onto 'SO4', '110 Richter' and '1103 Paulsen' rootstocks and trained in vertical shoot position, with no irrigation. Ecophysiological characteristics, yield and composition of ripe grapes were evaluated in three crop seasons (2007, 2008 and 2010). Rootstocks did not affect pre-dawn water potential, with values close to -0.2 MPa, indicating that there was no soil water deficit at the end of ripening (June). There was also no significant effect of rootstocks on yield. The rootstock '1103 Paulsen' induced lower vegetative growth, lower photosynthetic rate and the best results for berry maturation for crop seasons with lower amount of rainfall. The rootstocks '110 Richter' and 'SO4' showed higher vigor under the meteorological conditions of 2010 and the greatest photosynthetic rates in the same period. Meteorological conditions significantly affected technological and phenolic ripeness, with best results observed in drought years. The '1103 Paulsen' rootstock provides better balance between vigor and yield, increasing grape quality.