a b s t r a c tThe objective of this work was to evaluate the incidence of gray mold of the new seedless table grape 'BRS Vitoria' grown under subtropical conditions, during the cold storage. Grape bunches were obtained from a commercial field trained on overhead trellis and located at Marialva, state of Parana (PR) (South Brazil). The trials were conducted on two consecutive seasons, regular and out of season crops of 2013. Grapes were subjected to the following treatments in a cold chamber: (i) cold storage at 0 • (control); (ii) cold storage at 0 • C with SO 2 pad; (iii) cold storage at 0 • and inoculated with Botrytis cinerea suspension; (iv) cold storage at 0 • C with SO 2 pad and inoculated with B. cinerea suspension. The randomized design was used as statistical model with four treatments and five replicates, with 20 bunches per plot. The incidence of gray mold on grapes was evaluated at 30 days after the beginning of cold storage and at 7 days at room temperature after the end of cold storage. Grape physicochemical variables, such as bunch mass, berry firmness, bunch mass loss, skin color, soluble solids (SS), titratable acidity (TA) and SS/TA were evaluated at the beginning and 30 days after the period of cold storage. The results of this study showed that a good reduction of gray mold was achieved by SO2 during cold storage and shelf life periods. Also, bunch mass, berry firmness, mass loss, color, SS, TA and SS/TA of the grape tested was not negatively affected by SO 2 treatment. A good control of gray mold could be achieved on 'BRS Vitoria' table grapes by sulfur dioxide during storage without affecting fruit quality.
Visando à produção de vinho e suco de uva de melhor qualidade, o objetivo desta pesquisa foi aumentar a relação de sólidos solúveis totais/acidez total titulável (SST/ATT), conhecida como flavor, da uva 'Bordô', com o uso de reguladores vegetais e avaliar os efeitos destes produtos nas demais características físico-químicas dos frutos. O trabalho foi realizado durante duas safras, 2009/2010 e 2010/2011, em Bocaiuva do Sul-PR. As variáveis físicas analisadas foram: comprimento e largura dos cachos; diâmetro das bagas; número de bagas por cacho; massa dos cachos e bagas; e número de sementes por baga. As variávies químicas foram: sólidos solúveis totais (SST); acidez total titulável (ATT); pH e SST/ATT. A aplicação de GA3 a 100 mg L-1 propiciou melhoria da qualidade dos frutos para a produção de vinho e suco de uva, além de maior desenvolvimento dos frutos.
RESUMOO desenvolvimento da videira está bastante relacionado às condições climáticas de cada região; portanto, para se obter frutos de qualidade, torna-se essencial o conhecimento dos estádios fenológicos que, somados ao conhecimento da demanda térmica da planta, fazem com que o viticultor programe as práticas culturais de seu vinhedo reduzindo custos e fornecendo matéria-prima de qualidade para a indústria. O objetivo deste trabalho foi avaliar o potencial da uva 'Bordô' para seu cultivo na região de Bocaiuva do Sul-PR, caracterizar os estádios fenológicos, a demanda térmica e o momento de sua colheita. O experimento foi realizado em um vinhedo convencional, sustentado em espaldeira, no município de Bocaiuva do Sul, PR, em duas safras (2009/2010 e 2010/2011). As avaliações foram feitas desde a poda até a colheita sendo avaliados: estádios fenológicos, a exigência térmica e o momento de colheita por meio de análises químicas de sólidos solúveis, acidez titulável, pH e a relação sólidos solúveis/ acidez titulável. A uva 'Bordô' apresentou potencial para ser produzida em Bocaiuva do Sul, PR, cujo ciclo é de 154 a 171 dias e exigência térmica de 1524 a 1623 GD no período da poda à colheita. O momento ideal de colheita foi a primeira semana de fevereiro quando a uva 'Bordô' apresentou características mínimas exigidas pela legislação. Palavras-chave: pós-colheita, viticultura, Vitis labrusca Phenology, thermal requirement and ripening of the 'Bordo' grape in Bocaiuva do Sul, PR -Brazil ABSTRACTThe grapes cultivation is highly dependent on the climatic conditions of each region. Therefore to obtain high quality fruits it is essential to have knowledge of phenological stages, thermal demand of plant which helps the grower to program different cultural practices for vineyard which in turn reduce the cost of production and providing high quality raw material for the industry. The objective of this study was to evaluate the potential of the 'Bordo' grape for its cultivation in the region of Bocaiuva do Sul, PR, to characterize the phenological stages in days, the thermal demand and ideal time to harvest 'Bordo' grapes. The experiment was performed in a conventional orchard, conducted in trellis in the municipality of Bocaiuva do Sul, PR, harvests in 2009. Evaluations were made from pruning to harvest, were studied: the phenology, the thermal demand and timing of harvesting by means of chemical analyzes of SS, TA, pH and relation between SS/TA. The 'Bordo' grape has the potential to be produced in Bocaiuva do Sul-PR, with a cycle from 154 to 171 days and thermal demand from 1524 to 1623 GD during the pruning at harvest. The ideal time to harvest was the first week of February, when the 'Bordo' grapes already has the minimum characteristics required by law.
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