Biblioteca do Café

URI permanente desta comunidadehttps://thoth.dti.ufv.br/handle/123456789/1

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2001 - 200992010 - 2019112020 - 20233

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Autor: search.filters.author.Fonseca, Aymbiré Francisco Almeida daAssunto: search.filters.subject.Genética e melhoramento

Resultados da Pesquisa

Agora exibindo 1 - 10 de 23
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    Comparison of fructification efficiency between reciprocal crosses in Coffea canephora
    (Universidad Nacional de Colombia, 2023-10-09) Ferrão, Maria Amélia Gava; Fonseca, Aymbiré Francisco Almeida da; Ferrão, Romário Gava; Volpi, Paulo Sérgio; Verdin Filho, Abrão Carlos; Rocha, Rodrigo Barros; Riva-Souza, Elaine Manelli
    This study aimed to assess and compare the behavior of superior genotypes of Coffea canephora in terms of fruiting capacity using directed hybridizations in a full diallel design with reciprocals.Hybridizations were performed using 12 possible combinations between genotypes 02, 03, 23 and 83 from the Incaper breeding program. High estimates of the genotypic coefficient of determination in terms of the total number of pinheads per cross (TNP) and fruit set (FS) indicated variability of genetic nature. FS averaged 52,27%, ranging from 31,32% to 82,09%, with the higher rates relating to clone 23 as the male parent. Differences were found between reciprocal crosses in the combinations with genotype 23, which emerged as the donor plant with the best fruiting rate, but poor receiving ability. Clone 83 prevailed as the best receiving plant and the least effective donor. In the comparison of these two genotypes, antagonism was observed in their behavior when they were used as pollen-donor plants (male parents) and pollen-receiver plants (female parents), highlighting their possible maternal effect. Crosses involving clones 02 and 03 showed no differences when used reciprocally. The estimates of genotypic correlations were negative for the four associations involving the FS characteristic, being of greater magnitude with TNP.
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    Prediction of selection gains in Coffea canephora based on factorial scores
    (Crop Breeding and Applied Biotechnology, 2004) Ferreira, Adésio; Cecon, Paulo Roberto; Cruz, Cosme Damião; Ferrão, Romário Gava; Silva, Marcia Flores da; Fonseca, Aymbiré Francisco Almeida da; Ferrão, Maria Amélia Gava
    The technique of factor analysis in the simultaneous selection of traits and prediction of genetic gains was evaluated in Coffea canephora var. conilon. Fourteen traits in 40 assessed genotypes were evaluated at two sites. The technique was used aiming at the structuring and simplification of the data, without information loss and with biological interpretation. The experimental design was of randomized blocks in four replications, each plot containing two useful plants. The technique was efficient for the data simplification and structuring. Moreover, the estimates of the predicted gains in the traits involved in the factors showed magnitude near the direct selection gain, attesting the suitability of the technique and its use in improvement programs of the species.
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    Repeatability and number of harvests required for selection in robusta coffee
    (Crop Breeding and Applied Biotechnology, 2004) Fonseca, Aymbiré Francisco Almeida da; Sediyama, Tocio; Cruz, Cosme Damião; Sakiyama, Ney Sussumu; Ferrão, Romário Gava; Ferrão, Maria Amélia Gava; Bragança, Scheilla Marina
    This study aimed to estimate the repeatability coefficient of the grain yield in Coffea canephora by three methods: to quantify the precision of the measurements; to predict the real value of an individual based on n evaluations; and to determine the number of phenotypic measures required in each plant to obtain an adequate precision level for an efficient discrimination of the genotypes. The coefficients of repeatability and determination were estimated based on four harvests of 80 genotypes. Highest estimates of the repeatability coefficient were obtained by the method of the principal components derived from the matrix of covariances, which expresses the correlation between each measurement pair. The prediction precision of the real individual value ranged from 65.32 to 81.59%, and remained practically unchanged from the sixth harvest on.
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    Inter-trait relations for direct and indirect selection in coffee
    (Crop Breeding and Applied Biotechnology, 2008-06-09) Ferrão, Romário Gava; Ferreira, Adésio; Cruz, Cosme Damião; Cecon, Paulo Roberto; Ferrão, Maria Amélia Gava; Fonseca, Aymbiré Francisco Almeida da; Carneiro, Pedro Crescêncio de Souza; Silva, Marcia Flores da
    The purpose of this study was to verify the possibility of using direct selection in nine traits underlying indirect selection for yield and determine which traits should participate in the selection process. Data of 40 Conilon coffee genotypes were analyzed in two experiments in the growing seasons of 1996, 1998, 1999, 2000 and 2001 in random blocks with four and six replications. The significance of phenotypic associations was evaluated by the t test and the genotypic and environmental associations by bootstrap resampling. The genotypic associations were higher than the phenotypic, indicating a prevailing influence of the genotypic over the environmental effects in the relationship between significant traits; equal signs indicated a lack of contrary action among the effects. The traits related to cycle; yield; ratio of fresh ripe cherries to clean coffee; empty or flat grains; and sieve 17 should be maintained in the selection, evaluation and study of genetic divergence. The estimated gains in grain yield by indirect selection for any trait studied are not satisfactory.
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    Discriminant analysis for the classification and clustering of robusta coffee genotypes
    (Crop Breeding and Applied Biotechnology, 2004-07-07) Fonseca, Aymbiré Francisco Almeida da; Sediyama, Tocio; Cruz, Cosme Damião; Sakiyama, Ney Sussumu; Ferrão, Romário Gava; Ferrão, Maria Amélia Gava; Bragança, Scheilla Marina
    This study evaluated the adequacy of the composition of three clonal Coffea canephora varieties recommended for the State of Espírito Santo by a multivariate method designated discriminant analysis. This method consists in the establishment of functions that enable the classification of a given individual into one, among various distinct populations, reducing the probability of a misclassification. It simultaneously considers measures of several traits, in order to give the new variety homogeneity. The original classification of genotypes in the three studied varieties, based on agronomical criteria, maintained expressive concordance with the results of the discriminant analysis, with an apparent deviation rate of only 6.25%. Corrected discriminant functions were also proposed, capable of classifying a new genotype into one of the three clonal varieties to be used in improvement programs, eliminating the subjectivity of the clustering process.
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    Genetic divergence in Conilon coffee revealed by RAPD markers
    (Crop Breeding and Applied Biotechnology, 2009) Ferrão, Maria Amélia Gava; Fonseca, Aymbiré Francisco Almeida da; Ferrão, Romário Gava; Barbosa, Wellington Marota; Souza, Elaine Manelli Riva
    This study aimed to evaluate the genetic variability of 49 Coffea canephora clones of the breeding program of the Capixaba Institute of Research, Technical Assistance and Rural Extension (Incaper) based on RAPD markers. Thirty-one primers were used with polymorphism patterns that generated 333 markers, of which 231 (69.4%) were polymorphic. The group of genotypes based on the UPGMA algorithm and Tocher optimization methods detected high divergence in the genotypes. It was found that the component clones of each clone variety recommended by Incaper are distributed in various genetically dissimilar groups, in spite of common phenotypic traits. The relatively wide genetic diversity observed here demonstrates the importance of hybridizations between these germplasms. The RAPD markers efficiently estimated the genetic divergence in the 49 C. canephora genotypes studied.
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    Indicação de cultivares de café arábica para o estado do Espírito Santo e avaliação comparativa com o conilon em altitude elevada
    (Embrapa Café, 2021-04) Ferrão, Maria Amélia Gava; Riva-Souza, Elaine Manelli; Fonseca, Aymbiré Francisco Almeida da; Ferrão, Romário Gava; Santos, Walter Guedes dos; Spadeto, José
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    'ES8161 Goytacá': porta-enxerto clonal de café Conilon resistente a nematoide-das-galhas
    (Incaper, 2022-07) Lima, Inorbert de Melo; Ventura, José Aires; Costa, Hélcio; Volpi, Paulo Sérgio; Ferrão, Maria Amélia Gava; Verdin Filho, Abraão Carlos; Ferrão, Romário Gava; Fonseca, Aymbiré Francisco Almeida da; Comério, Marcone
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    Genótipos de café conilon e sua reação à ferrugem alaranjada
    (Grupo Paulista de Fitopatologia, 2019) Mendonça, Rodolfo Ferreira de; Jesus Junior, Waldir Cintra de; Ferrão, Maria Amélia Gava; Moraes, Willian Bucker; Busato, Laedio Magno; Ferrão, Romário Gava; Tomaz, Marcelo Antonio; Fonseca, Aymbiré Francisco Almeida da
    O objetivo deste trabalho foi avaliar o comportamento de 54 clones de cafeeiro conilon oriundos do Programa de Melhoramento Genético do Incaper à ferrugem em condições controladas de temperatura e fotoperíodo. Utilizou-se o delineamento inteiramente casualizado com três repetições, sendo cada repetição composta por 16 discos de folha cada, acondicionados em gerbox e inoculados com 104 esporos.mL-1 de H. vastatrix. Os gerbox foram colocados sob ausência de luz e 22ºC por 48 horas e então em fotoperíodo de 12 horas até o término do experimento. Foram avaliados os componentes de resistência: período de incubação, período latente, incidência, porcentagem de discos com esporulação, número de esporos e severidade. Com base nos resultados verificou-se a formação de três grupos de genótipos de café conilon: Resistentes, Moderadamente Resistentes e Suscetíveis. No grupo Resistente foram alocados 19 genótipos, no grupo Moderadamente Resistente foram alocados 19 genótipos e no grupo Suscetível foram alocados 16 genótipos. Assim, com base nos resultados, conclui-se que há variação no nível de resistência dos genótipos de C. canephora à H. vastatrix. Tal informação subsidia os programas de melhoramento na seleção adequada de progênies de C. canephora quanto à resistência à ferrugem.
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    Caracterização sensorial de progênies de café arábica em fase avançada de melhoramento genético no Espírito Santo
    (Embrapa Café, 2019-10) Fonseca, Aymbiré Francisco Almeida da; Ferrão, Maria Amélia Gava; Pereira, Lucas Louzada; Taques, Renato; Souza, Elaine Manelli Riva
    O café é um produto agrícola cujo valor comercial é vinculado à sua qualidade. Quanto melhores as suas propriedades, maiores serão os preços alcançados. A qualidade do café pode ser influenciada por um conjunto de fatores, destacando-se as características genéticas, as condições ambientais e práticas culturais empregadas, sobretudo na colheita, processamento e secagem. As características sensoriais podem ser influenciadas pela acidez da bebida, sabor e fragrância, entre outras. O Incaper desenvolve um programa de pesquisa na área de melhoramento genético que possui, entre seus objetivos, a caracterização da qualidade dos genótipos elites e em fase de pré-lançamento, para que as novas cultivares a serem lançadas e recomendadas para o Estado, distingam-se também por este importante atributo. Este trabalho visa a identificação de progênies com qualidade sensorial superior para subsidiar o desenvolvimento e recomendação de novas cultivares que aliem, qualidade genética à boa performance agronômica para o Estado. Foram analisadas amostras de 40 progênies elites de café Arábica do referido programa. Os resultados mostram que o comportamento das progênies é altamente influenciado pela safra e pela forma de processamento. A partir da análise de componentes principais foi possível agrupar os genótipos em três grupos em função da pontuação total alcançada para cada genótipo avaliado na análise sensorial, nos dois sistemas de processamento, considerando a média dos dois anos safras, permitindo indicar aquelas mais indicadas para se constituírem novas cultivares, desde que aliem este comportamento às outras características agronômicas e industriais.