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The São Francisco Valley is the main producing region of table grape in Brazil. The objective of this work was to evaluate the agronomic performance and physicochemical characteristics of 14 seedless table grape genotypes to select those with potential to be used in commercial crops in the São Francisco Valley, Brazil, or as parents in breeding programs. The experiment was carried out over five crop seasons (2014 to 2018), in Petrolina, PE, Brazil. The treatments consisted of 14 seedless table grape genotypes. The results showed significant effects for all variables evaluated. The highest estimated yield per production cycle were found for ?Marroo Seedless? (26.5 t·ha-1), ?BRS Linda? (26.4 t·ha-1), ?CNPUV 23? (24.9 t·ha-1), ?A1105? (24.3 t·ha-1),and ?A Dona? (20.2 t·ha-1). Soluble solid (SS) content varied from 13.35 ºBrix (?CNPUV 23?) to 21.63 ºBrix (?A Dona?). The titratable acidity (TA) of the genotypes varied from 0.27 g·100 mL-1 (?CNPUV 23?) to 0.72 g·100 mL-1 (?Crimson Seedless?). Principal component analysis showed that the first three principal components explained 81.9% of the data variance, and grouped the best genotypes for production components and fruit chemical composition on different sides of the X-axis. These results allowed the identification of a group of seedless grape cultivars that can be used for commercial crops or as parents for controlled crossings in a local table grape breeding program. Made available in DSpace on 2021-10-03T02:03:29Z (GMT). No. of bitstreams: 1 Agronomic-performance-of-seedless-table-grape-2020.pdf: 188872 bytes, checksum: f8679acabb76e52a09e577afd1ea2173 (MD5) Previous issue date: 2020

EnglishThe objective of this study was to evaluate the productive performance and physicochemical characteristics of ‘BRS Magna’ and ‘Isabel Precoce’ grapes influenced by two types of pruning. The experiment was carried out during two growing seasons in a commercial vineyard of Petrolina, PE, in the period 2013-2014. Treatments were represented by two cultivars, ‘Isabel Precoce’ and ‘BRS Magna’, and two types of pruning, with selection during plant formation (P1) and without selection (P2) of lateral branches, using a randomized experimental block design, in subdivided plots and four replicates. After pruning P2, the amount of buds kept on vines was greater than after pruning P1, favoring an increase in yield. However, the sizes of bunches and berries, content of soluble solids, and titratable acidity were not influenced by the pruning type. In general, the sizes of bunches and berries in ‘BRS Magna’ were larger than in the ‘Isabel Precoce’ cultivar. Conversely, content of soluble solids and titratable acidity varied among cultivars as a function of production cycle and type of pruning; however, within the standards described for both cultivars and accepted by the Brazilian legislation. Key words: tropical viticulture; grapevine; juice grapes; Vitis labrusca portuguesO presente trabalho teve como objetivo estudar o desempenho produtivo e caracteristicas fisico-quimicas das uvas ‘BRS Magna’ e ‘Isabel Precoce’ submetidas a dois tipos de poda. Um experimento foi realizado durante dois ciclos de producao, nos anos de 2013 e 2014, em um vinhedo comercial em Petrolina, PE. Os tratamentos foram representados por duas cultivares copa, ‘Isabel Precoce’ e ‘BRS Magna’, e dois tipos de poda, com selecao de ramos laterais na formacao da planta (P1) e sem selecao de ramos laterais (P2), utilizando delineamento experimental em blocos ao acaso em parcelas subdivididas e quatro repeticoes. A quantidade de gemas mantidas na videira apos a poda e mais elevada na poda P2, favorecendo o aumento da produtividade, mas o tamanho dos cachos e das bagas e o teor de solidos soluveis e acidez titulavel nao foram influenciados pelo tipo de poda. O tamanho dos cachos e das bagas da cultivar ‘BRS Magna’ e, de modo geral, maior que os de ‘Isabel Precoce’. Por outro lado, o teor de solidos soluveis e acidez titulavel variaram entre as cultivares em funcao do ciclo de producao e do tipo de poda, estando dentro dos padroes descritos para ambas cultivares e aceitos pela legislacao brasileira. Palavras-chave: viticultura tropical; videira; suco de uva; Vitis labrus

This study aimed to evaluate the effect of shoot and bunch density through thinning practices on yield components and quality of ‘Thompson Seedless’ and ‘Sugraone’ grapevines in the São Francisco River valley. The experiments were carried out during two growing seasons (2010 and 2012) in commercial vineyards of Lagoa Grande, state of Pernambuco, Brazil. Treatments were a split plot represented by three shoot densities and three bunch densities in a random block design. The yield of ‘Thompson Seedless’ grapevine was up to 25.9% higher in plants kept with 6 bunches.m-2, reaching 20.7 and 27.0 kg.plant-1, in the 2010 and 2012 crop years, respectively. Although effects on yield were not observed in ‘Sugraone’ cultivar, bunch and berry mass was higher in treatments with 5 bunches.m-2 and 7 shoots.m-2, respectively, in the last production cycles. ‘Thompson Seedless’ grapes with greater berry firmness were harvested in 2012 in plants submitted to densities of 7 or 8 shoots.m-2, while the contents of soluble solids and total soluble sugars were higher in grapes harvested from plants with lower shoot and bunch densities. However no effects of treatments on the contents of soluble solids were observed in ‘Sugraoen’ grapes. The use of 7 shoots.m-2 associated to 6 bunches.m-2 is recommended for ‘Thompson Seedless’ grapevines because it increased yield with no harm to fruit quality, while for ‘Sugraone’, densities of 7 shoots.m-2 and 5 bunches.m-2 can be used to increase the mass of bunches and berries. RESUMO Este trabalho teve como objetivo avaliar a influência de diferentes densidades de brotos e de cachos, por meio das práticas de desbrota e desbaste, sobre os componentes de produção e qualidade dos cachos de uvas ‘Sugraone’ e ‘Thompson Seedless’ no Vale do São Francisco. Os experimentos foram realizados durante dois ciclos de produção (2010 e 2012), em vinhedos comerciais no município de Lagoa Grande, PE. Os tratamentos estavam distribuídos em parcelas subdivididas, representadas por três densidades de brotos e três densidades de cachos, em delineamento experimental em blocos ao acaso. A produção em ‘Thompson Seedless’ foi 25,9% maior em plantas mantidas com 6 cachos.m-2, alcançando 20,7 e 27,0 Kg.planta-1, nas colheitas de 2010 e 2012, respectivamente. Na cultivar Sugraone, não houve efeitos sobre a produção por planta, embora a massa do cacho e da baga tenham sido maiores, em, pelo menos, um ciclo de produção, respectivamente, nos tratamentos com densidade de 5 cachos.m-2 e 7 brotos.m-2. Em ‘Thompson Seedless’, uvas mais firmes foram colhidas em 2012, de plantas com 7 ou 8 ramos.m-2, enquanto os teores de sólidos solúveis e de açúcares solúveis totais foram maiores nas uvas colhidas de plantas com menores densidades de brotos e cachos. Entretanto, na ‘Sugraone’ não se observou efeito dos tratamentos sobre o teor de sólidos solúveis totais. Recomenda-se, para a cultivar Thompson Seedless, densidade de 7 brotos.m-2 associado a 6 cachos.m-2 por favorecer a produtividade sem prejuízo da qualidade dos frutos, enquanto para a cv. Sugraone, densidades de 7 brotos.m-2 e 5 cachos.m-2 podem ser utilizadas para incrementar a massa de cachos e bagas.