Estratégias de seleção no melhoramento genético do maracujazeiro azedo

• Ano de defesa: 2014
• Autor(a) principal: Rocha, Makyslano Rezende da
• Orientador(a): Santos, Carlos Eduardo Magalhães dos
• Banca de defesa: Silva, Felipe Lopes da
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Federal de Viçosa
• Programa de Pós-Graduação: Mestrado em Agronomia
• Departamento: Produção Vegetal
• País: BR
• Palavras-chave em Português: REML/BLUP; Índices de seleção; Melhoramento
• Palavras-chave em Inglês: REML / BLUP; Selection indices; Improvement
• Área do conhecimento CNPq: CNPQ::CIENCIAS AGRARIAS::AGRONOMIA
• Link de acesso: http://locus.ufv.br/handle/123456789/2040

The culture of yellow passion fruit has expanded considerably, making Brazil the world s largest producer and consumer of the fruit. Several strategie have been applied to improve in order to obtain superior progenies productivity and physicochemical qualities of fruits. However, seeking to adopt more precise selection methods, there is employed genetic values as a way of increasing genetic gain due to selection This study aimed to compare the selection strategies using the mixed model methodology (REML / BLUP) and methods based on phenotypic values in a population of half brothers of passion fruit. We evaluated 24 half-sib progênies of yellow passion fruit in randomized blocks with three replications and four plants per plot, installed in the experimental field of Universidade Federal de Viçosa/Campus de Rio Paranaíba. The characters evaluated were: number of fruits, fruit longitudinal length, equatorial diameter of fruit, fruit mass, pericarp mass, pulp mass, pericarp thickness, total soluble solids and total titratable acidity. Genetic and phenotypic parameters were estimated by Anova and the methodology REML / BLUP. The genetic gains were estimated by direct selection, among and within, combined and selection indexes obtained by phenotypic values and genotypic values for individual selection and selection indexes. Comparisons were made between the selection strategies based in phenotypic values and genotypic values through genetics gains and coincidence coefficient. The selection indexes based on phenotypic values provided well distributed gains relative to univariate methods. The ranks phenotypic sum index provided genetic gain better distributed between characters. The individual selection of progeny via BLUP equivalent to direct selection, among and within and combined obtained by phenotypic values. The sum of ranks index via phenotypic values is a good index compared to the selection indexes via BLUP. Index terms: REML/BLUP, selection indexes, improvement.