Biblioteca do Café
URI permanente desta comunidadehttps://thoth.dti.ufv.br/handle/123456789/1
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Item Prediction of genetic gains from selection in Arabica coffee progenies(Crop Breeding and Applied Biotechnology, 2011-09-08) Oliveira, Antonio Carlos Baião de; Pereira, Antonio Alves; Silva, Felipe Lopes da; Rezende, Juliana Costa de; Botelho, César Elias; Carvalho, Gladyston RodriguesGains from selection for yield were estimated in Arabica coffee progenies carrying rust-resistance genes. The experiment in augmented block design was installed in Três Pontas, state of Minas Gerais. Three blocks were established with six plants per plot, spaced 3.50 x 0.90 m, in 96 regular (F2 progenies) and two control treatments. The plant response to rust was evaluated on a grade scale in 2008. Yield (bags per hectare) was estimated in the growing seasons 2005 to 2008. Significant differences between treatments for yield were observed in all harvests, except 2005. The presence of genetic variability among progenies allowed significant gain from selection for yield. Under the experimental conditions of this study, selection for yield can be performed in the first high-yield year, without major losses compared to genetic gain from selection for yield when based on the mean of four harvests.Item Partial map of Coffea arabica L. and recovery of the recurrent parent in backcross progenies(Crop Breeding and Applied Biotechnology, 2007-06-30) Oliveira, Antonio Carlos Baião de; Sakiyama, Ney Sussumu; Caixeta, Eveline Teixeira; Zambolim, Eunize Maciel; Rufino, Raphael José Nascif; Zambolim, LaércioA partial map of Coffea arabica L. was constructed based on a backcross population and RAPD markers. From a total of 178 markers evaluated, only 134 that segregated 1:1 (P>0.05) were used to develop the map. Seventeen markers were not linked, while 117 formed 11 linkage groups, covering a genome distance of 803.2 cM. The maximum distance between adjacent markers was 26.9 cM, and only seven intervals exceeded 20 cM. The markers were further used for assisted selection of the plants closest to the recurrent parent, to accelerate the introgression of rust resistance genes in the coffee breeding program. Three BC1 plants resistant to coffee leaf rust and with high genetic similarity to ?Catuaí? were selected and integrated in the following backcross cycles.Item Estimates of genetic parameters in Arabic coffee derived from the Timor hybrid(Crop Breeding and Applied Biotechnology, 2007-06-30) Mistro, Júlio César; Fazuoli, Luiz Carlos; Gallo, Paulo Boller; Oliveira, Antonio Carlos Baião de; Toma-Braghini, Masako; Silvarolla, Maria BernadeteGenetic parameters of Arabic coffee progenies derived from the cross Villa Sarchi x Timor hybrid were estimated in order to evaluate their potential for improvement. The experiment was installed in a random block design with ten treatments, eight replicates and eight plants per plot. The parameters cherry yield, plant height, canopy diameter, seed types and sizes were estimated. Results demonstrated significant differences between treatments for all traits. Greatest yield gains were achieved when the selection was performed based on plot means and in years of high yields. The variation index b was the best indicator of genetic variability. The progenies IAC 3786. IAC 3788, IAC 4094, IAC 4095, IAC 3425, and IAC 3429 were outstanding regarding the evaluated agronomic traits, representing progenies of high agronomic potential. All progenies presented leaf rust resistance.Item Otimização da experimentação no melhoramento do cafeeiro(Embrapa Café, 2023-09) Resende, Marcos Deon Vilela de; Alves, Rodrigo Silva; Oliveira, Antonio Carlos Baião de; Caixeta, Eveline Teixeira; Pereira, Antonio Alves; Mariz, Bruna LopesItem Aceleração do melhoramento do cafeeiro via seleção genômica : agilidade e eficácia no lançamento de novas cultivares(Embrapa Café, 2022-08) Caixeta, Eveline Teixeira; Resende, Marcos Deon Vilela; Alkimim, Emilly Ruas; Sousa, Tiago Vieira; Oliveira, Antonio Carlos Baião de; Pereira, Antonio Alves; Alves, Rodrigo SilvaItem Cultivares de café resistentes à ferrugem : alternativa viável para a cafeicultura das Matas de Minas(2021-12) Oliveira, Antonio Carlos Baião de; Pereira, Antonio Alves; Caixeta, Eveline Teixeira; Resende, Marcos Deon Vilela; Ribeiro, Marcelo de FreitasItem Tamanho amostral e detecção de genes via GWAS em características quantitativas do cafeeiro(Embrapa Café, 2022-04) Resende, Marcos Deon Vilela de; Oliveira, Antonio Carlos Baião de; Caixeta, Eveline Teixeira; Alkimim, Emilly Ruas; Sousa, Tiago Vieira; Pereira, Antonio Alves; Alves, Rodrigo Silva; Azevedo, Camila FerreiraO presente documento refere-se à avaliação prática do potencial da GWAS no melhoramento dos cafeeiros das espécies Coffea arabica e Coffea canephora. O objetivo geral é orientar a aplicação eficiente da GWAS em características produtivas, agronômicas e de resistência a doenças e pragas do cafeeiro. Para isso, um novo método para o estudo de associações genômicas foi desenvolvido e avaliado via simulação, em termos de poder de detecção de genes. O objetivo específico é possibilitar a identificação de marcadores genéticos úteis ao melhoramento do cafeeiro.Item Sensory quality of Coffea arabica L. genotypes influenced by postharvest processing(Crop Breeding and Applied Biotechnology, 2019) Barbosa, Ivan de Paiva; Oliveira, Antonio Carlos Baião de; Rosado, Renato Domiciano Silva; Sakiyama, Ney Sussumu; Cruz, Cosme Damião; Pereira, Antônio AlvesThe specialty coffee market has grown significantly in the past decades and has several cultivars with productive potential. The objective of this study was to evaluate the sensory profile of the beverage produced from Coffea arabica L. genotypes based on postharvest processing and to identify cultivars with the greatest genetic potential for coffee cultivation in the city of Araponga, Minas Gerais, Brazil. The experiment was a randomized complete block design with two replicates and 11 genotypes with different levels of resistance to rust. The sensory profile demonstrated an interaction between the genotype and the processing technique. Five of the genotypes presented total scores above 85 points according to the SCAA protocol. Moreover, two of these genotypes yielded heightened sensory notes after undergoing dry processing. The selection of coffee genotypes should consider the level of technology involved in the drying of the coffee beans, which preserves the potential quality of the beverage.Item Análise sensorial da bebida de genótipos de café arábica resistentes à ferrugem de acordo com o processamento pós-colheita(Embrapa Café, 2019) Pereira, Vanessa Vitoriano; Oliveira, Antonio Carlos Baião de; Barbosa, Ivan de Paiva; Pereira, Antonio Alves; Sakiyama, Ney SussumuO objetivo deste estudo foi comparar descritivamente 10 genótipos resistentes à ferrugem (Araponga MG1, Catiguá MG1, Catiguá MG2, Catiguá MG3, Catucaí Amarelo 24/137, Oeiras MG6851, Paraíso MG H419-1, Pau-Brasil MG1, Sacramento MG1 e H419-3-3-7-16-4-1) e uma cultivar susceptível, Catuaí Vermelho IAC 144, em relação a qualidade sensorial de bebida do café, considerando os tipos de café despolpado (processado por via úmida) e café natural (via seca). O experimento foi conduzido no município de Araponga – MG. O delineamento experimental utilizado foi blocos casualizados, com duas repetições. A colheita seletiva dos frutos de café foi realizada entre maio e julho de 2016. As amostras foram divididas em duas porções: uma delas destinada à secagem a pleno sol em terreiros suspensos (café natural); a outra destinada à máquina descascadora de frutos (café cereja descascado). Os grãos descascados foram fermentados naturalmente por 24 horas e em seguida, a massa de grãos foi lavada em água corrente para retirada da mucilagem e submetida à secagem do mesmo modo descrito anteriormente. Após a estabilização da umidade em 11%, as amostras foram beneficiadas e enviadas para avaliação da qualidade sensorial da bebida, conforme o protocolo SCAA. Os dados foram analisados pelo aplicativo computacional GENES. As cultivares derivadas de Híbrido de Timor não diferiram significativamente ou foram superiores à cultivar Catuaí Vermelho IAC 144. O café natural da cultivar Catucaí Amarelo 24/137 não se classificou como café especial de acordo com o protocolo SCAA. No que se refere ao estudo comparativo entre o café despolpado e o natural para a pontuação total, houve atribuição de pontuações absolutas superiores para o café despolpado para todas as cultivares, porém, houve diferença significativa somente para a progênie H419-3-3-7-16-4-1 e para as cultivares Catuaí Vermelho IAC 144, Catucaí Amarelo 24/137 e Paraíso MG H419-1.Item Triple plagiotropic branch in coffee: a new promising mutant?(Crop Breeding and Applied Biotechnology, 2017-10) Sakiyama, Ney Sussumu; Picoli, Edgard Augusto de Toledo; Oliveira, Antonio Carlos Baião de; Caixeta, Eveline Teixeira; Zambolim, Laércio; Martinez, Hermínia Emília Prieto; Pereira, Antonio AlvesCoffee tree is a shrub with dimorphic branches. The orthotropic stem grows vertically with two near-horizontal plagiotropic branches, per node, in opposite phyllotaxy. The consecutive nodes of the orthotropic stem are organ- ized in parastichies. We report here mutant plants of Coffea arabica with triple plagiotropic branch, resulted from the whorled phyllotaxy of the orthotropic stem. In mutant plants three plagiotropic branches in the same node are sepa- rated by angles of approximately 120 o , while in normal plants two plagiotropic branches in the same node are separated by angles of approximately 180 o . In mutant plants the angles of the parastichies increase approximately 50 o clock- wise between consecutive nodes, while in normal plants the angles increase approximately 87 o . The plant architecture is changed. The triple plagiotropic branch is a putative mutant with potential to be explored in coffee breeding programs. The hypotheses for the origin of the mutation and the research perspectives are discussed.