Variabilidade genética, controle genético e avaliação de características de pimenteiras ornamentais (Capsicum annuum)

• Ano de defesa: 2012
• Autor(a) principal: Santos, Rusthon Magno Cortez dos
• Orientador(a): Oliveira, Aluízio Borém de
• Banca de defesa: Rêgo, Mailson Monteiro do
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Federal de Viçosa
• Programa de Pós-Graduação: Mestrado em Genética e Melhoramento
• Departamento: Genética animal; Genética molecular e de microrganismos; Genética quantitativa; Genética vegetal; Me
• País: BR
• Palavras-chave em Português: Diversidade genética; Herdabilidade
• Palavras-chave em Inglês: Genetic diversity; Heritability
• Área do conhecimento CNPq: CNPQ::CIENCIAS AGRARIAS::AGRONOMIA::FITOTECNIA::MELHORAMENTO VEGETAL
• Link de acesso: http://locus.ufv.br/handle/123456789/4762

The breeding of pepper has been done by means of mass selection in landraces and breeds in recent times, some breeders have emphasized the use of hybridization in breeding programs. The knowledge the type of inheritance of the characteristics that will undergo continuous selections and diversity generated from the crossing is critical to the success of a breeding program. Thus the objectives of this work were study the type of allelic interaction and heritability involved in 19 quantitative traits of ornamental peppers, as well as the diversity generated from a cross between these divergent plants,using quantitative and qualitative data separately and integrated into a single analysis. We chose two access belonging to the germplasm bank of vegetable plants UFPB, contrasting to the greatest number of characters (77.3 and 76). These were crossed to form F1 generation. The F2 seeds were obtained from the selfing of the F1 generation. The crossing of the latter with their parents led generations back crossed BC1 and BC2. All these generations were used for studies of allelic interaction analysis and generation for all traits, except the qualitative traits. We used 10 plants of each parent and F1, and 180, 90 and 90 for each F2, RC1 and RC2, respectively. For the analysis of genetic diversity were used all generations. Three methods were compared to generate of matrices and two types data integration. The values found for the broad-sense heritability were higher than 0.6 in all studied traits except for petiole length, leaf width and dry weight of fruit. Estimates of narrow sense heritability were greater than 0.5 in all characteristics except for corolla diameter, petal width, smaller fruit diameter and dry matter. The characteristics of the plant the additive-dominant model was adequate to explain the variation found in the characteristics crown width, plant height, stem length, leaf width and diameter of the corolla, thus, the epistatic effects significantly influence the expression of other characteristics. As for the content of anthocyanin in flowers, stem, leaf and fruit, were observed values in the broad sense heritability and narrow above 0.85 and 0.63, respectively, and the additive-dominant model was adequate to explain the variation found in these four characteristics. From the cross between the acess 77.3 and 76.Possible was to generate genetic variability as much as we used quantitative data separately for the use of both a single integrated data analysis of genetic diversity.