Seleção em famílias de irmãos completos de maracujazeiro amarelo (Passiflora edulis Sims f. flavicarpa Deg.) no segundo ano de produção

• Ano de defesa: 2007
• Autor(a) principal: Linhales, Heloisa
• Orientador(a): Bruckner, Claudio Horst
• Banca de defesa: Siqueira, Dalmo Lopes de , Freitas, Gilberto Bernardo de
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Federal de Viçosa
• Programa de Pós-Graduação: Mestrado em Fitotecnia
• Departamento: Plantas daninhas, Alelopatia, Herbicidas e Resíduos; Fisiologia de culturas; Manejo pós-colheita de
• País: BR
• Palavras-chave em Português: Passiflora edulis Sims flavicarpa Deg.; Seleção entre e dentro de famílias; Seleção combinada; Seleção massal; Seleção massal estratificada
• Palavras-chave em Inglês: Passiflora edulis Sims flavicarpa Deg.; Selection of families; Combined selection; Massal selection; Stratified massal selection
• Área do conhecimento CNPq: CNPQ::CIENCIAS AGRARIAS::AGRONOMIA::FITOTECNIA
• Link de acesso: http://locus.ufv.br/handle/123456789/4654

The objective of this work was to select superior genotypes of the yellow passion flower related to productivity and quality of the fruits. A population of 26 families of whole brothers was evaluated in the second year of production, in a design of random plots, with three repetitions, starting with four plants per plot. The experiment was carried out in the experimental area of Fruitculture in the Departamento de Fitotecnia of the Universidade Federal de Viçosa, in Viçosa, Minas Gerais State, Brazil. In the selection among and within the families, the efficiency of the direct and indirect selection as well as that based on the classical index was verified. The selection strategies among and within, combined, massal and stratified massal were compared. The results found by the selection among and within were compared with those obtained from the selection made in this same population in the first year of production. The characteristics measured were number of fruits per plant, estimated production per plant, length of the fruit, diameter of the fruit, weight of the fruit, weight of the peel, thickness of the peel, weight of the pulp, color of the pulp, percentage of the pulp, total content of soluble solids, titrable total acidity and the rate between the total soluble solids/titrable total acidity. Samples of 10 fruits of each plant were obtained to evaluate the qualitative characteristics of the fruits. The collection of the fruits for the analyses was made as they became yellowishgreen, during the second year of production, from January to July 2006. All the statistical analyses were made with the genetics and statistics software GENES. The selection gains were estimated based on a percentage of 24% among families and of 25% within families for all the characteristics measured. The selection criterium adopted for all the characteristics was the increase in peel their original mediuns, except for the weight and thickness of the peel for which a decrease was desired. For the characteristics choice that were part of the classic index of selection, the multicolinearity diagnosis was carried out, using the autovalues and the autovectors analyses. The selected characteristics to make up the index were estimated production per plant, diameter of the fruit, pulp percentage, pulp color and total titrable acidity. The use of the strategy of simultaneous selection of characters, based on the classic index showed estimations of gains greater than those of the other methodologies, in estimated production per plant and pulp percentage. In the direct selection, the estimations of gains were greater in pulp color and total titrable acidity. The combined selection, when compared to the among and within selection massal and stratified massal, provided the greatest estimations of gains in 11 out of 13 characteristics evaluated, except length and weight of the fruit, thus being the most suitable strategy for the breeding of the population studied. The evaluations made in the first year of production generated satisfactory results, which practically were reproduced in the second year, and therefore can be recommended, because of costs and time reduction of the selection cycle.