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URI permanente desta comunidadehttps://thoth.dti.ufv.br/handle/123456789/3352
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Resultados da Pesquisa
Item Selection of conilon coffee clones tolerant to pests and diseases in Minas Gerais(Crop Breeding and Applied Biotechnology, 2019) Silva, Vânia Aparecida; Abrahão, Juliana Costa de Rezende; Lima, Luiz Antônio; Carvalho, Gladyston Rodrigues; Ferrão, Maria Amélia Gava; Salgado, Sônia Maria Lima; Volpato, Margarete Lordelo; Botelho, César EliasIn the northern Minas region, the dry-warm climate predisposes coffee plants to the occurrence of leaf miners, mites, cercosporiosis, and leaf scald. Aiming for the development of a cultivar adapted to these conditions, Coffea canephora Pierre ex A. Froehner clones were selected through genetic parameters under an irrigated system, without agrochemicals. Eighteen agronomic traits were evaluated. The survival rate, number of nodes per plagiotropic branch, leaf miner infestation and cercosporiosis incidence were chosen as characteristics for selection of ‘Vitória Incaper 8142’, once they have shown superiority of the genetic parameters. The survival rate variable was used to rank the EMCAPA 8141 Robustão Capixaba clones. Clones V2, V4, V6, V13, RC7, and RC9 were selected as more tolerant to pests and diseases and can provide genetic improvements in conilon breeding program for region. The genetic dissimilarity identified between clones allowed suitable clone combinations to be proposed for use in future crosses.Item Adaptability, stability, and genetic divergence of conilon coffee in Alto Suaçuí, Minas Gerais, Brazil(Crop Breeding and Applied Biotechnology, 2017-01) Silva, Vânia Aparecida; Machado, Janaine Lopes; Rezende, Juliana Costa de; Oliveira, Alexandrino Lopes de; Figueiredo, Ulisses José de; Carvalho, Gladyston Rodrigues; Ferrão, Maria Amélia Gava; Guimarães, Rubens JoséThe objective of this study was to describe the genetic parameters, adapt- ability, and stability of clones from the Coffea canephora variety ‘Vitória Incaper 8142’, and the genetic divergence between them. Following 12 and 24 months of plant growth, several traits were evaluated, including stem diameter, plant height, canopy diameter, number of plagiotropic branches, and number of nodes per plagiotropic branch. The agronomic performance of four crops was determined using measurements of productivity, yield, percentage of floating grains, and grade of the beans. Variability was observed between the clones for the majority of the traits measured. The clones V7, V10, V12, and V13 were the most stable and displayed the highest degree of adaptation for the studied traits, and thus these clones will be used to establish a base population suited to the growing conditions in Alto Suaçuí, Minas Gerais, Brazil. Additionally, the genetic dissimilarity identified between clones allowed suitable clone combinations to be proposed for use in future crosses.Item Resposta fisiológica de clone de café Conilon sensível à deficiência hídrica enxertado em porta‐enxerto tolerante(Empresa Brasileira de Pesquisa Agropecuária - Embrapa, 2010-05) Silva, Vânia Aparecida; Antunes, Werner Camargos; Guimarães, Breno Lourenzzo Salgado; Paiva, Rita Márcia Cardoso; Silva, Vanisse de Fátima; Ferrão, Maria Amélia Gava; DaMatta, Fábio Murilo; Loureiro, Marcelo EhlersO objetivo deste trabalho foi determinar alterações fisiológicas e de tolerância à seca em clones de café Conilon (Coffea canephora) contrastantes quanto à sensibilidade ao deficit hídrico. Foram avaliadas as enxertias recíprocas entre os clones 109A, sensível ao deficit hídrico, e 120, tolerante – 120/109A, 120/120, 109A/120, 109A/109A –, além de seus respectivos pés‐francos. As plantas foram cultivadas em vasos de 12 L em casa de vegetação. Após seis meses, metade das plantas foi submetida ao deficit hídrico por meio da suspensão da irrigação, até que as folhas atingissem o potencial hídrico de antemanhã de ‐3,0 MPa. Quando o clone 120 foi usado como porta‐enxerto, as plantas apresentaram sistema radicular mais profundo, mas com menor massa, retardaram por mais tempo a desidratação celular das folhas e apresentaram maior eficiência no uso da água. Sob seca severa, os teores de amido e sacarose decresceram em todos os tratamentos, enquanto os teores de glicose, frutose, aminoácidos totais e prolina aumentaram, particularmente nos tratamentos 109A pé‐franco, 109A/109A e 120/109A. Essas plantas apresentaram menor eficiência no uso da água. O acúmulo de solutos não foi associado à tolerância à seca. O uso de porta‐enxertos tolerantes à seca contribui para a maior tolerância das plantas ao deficit hídrico.