Eficiência do metódo blupis no melhoramento da cana-de-açúcar

• Ano de defesa: 2012
• Autor(a) principal: Castro, Rogério Donizeti de
• Orientador(a): Peternelli, Luiz Alexandre
• Banca de defesa: Carneiro, Pedro Crescêncio Souza , Silva, Felipe Lopes da , Kist, Volmir
• Tipo de documento: Tese
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Federal de Viçosa
• Programa de Pós-Graduação: Doutorado em Genética e Melhoramento
• Departamento: Genética animal; Genética molecular e de microrganismos; Genética quantitativa; Genética vegetal; Me
• País: BR
• Palavras-chave em Português: Modelos mistos; Seleção de famílias; Valor genotípico
• Palavras-chave em Inglês: Mixed models; Selecting families; genotypic Value
• Área do conhecimento CNPq: CNPQ::CIENCIAS AGRARIAS::AGRONOMIA::FITOTECNIA::MELHORAMENTO VEGETAL
• Link de acesso: http://locus.ufv.br/handle/123456789/1357

The objective of this work was to evaluate the efficiency of the BLUPIS procedure modified for the selection between and among sugarcane families in comparison to the BLUPI procedure, and to determine the repeatability between harvests measured in full sibs families for sugarcane agro industrial characteristics at the beginning of the selection stages. One hundred and ten full sibling families were allocated in an experiment installed in completely randomized blocks design with five replicates. The data of the cane plant were collected in June 2008 and of the sugarcane ratoon in June 2009. The following characteristics were determined from the cane plant and first ratoon: percentage of soluble solids in the juice (Brix), diameter, height, number of stalks, tons of sugarcane per hectare (TSH) and tons of Brix per hectare (TBH). The variance components were estimated by restricted maximum likelihood (REML). The genotypic values of the families and of each individual inside a family were obtained via BLUP. Genetic variability and TSH selection possibility was found. The experiment presented high precision, with selective accuracy of 0.90 and heritability of the family mean in the broad sense of 0.82. Twenty-nine families, which represent 27% of the evaluated families, were selected. The modified BLUPIS procedure presented correlation of 0.98 with BLUPI. The repeatability estimates for the characteristics number of stalks, TSH and TBH were 0.70, 0.67 and 0.66, respectively. The families genotypic correlation values were 0.70, 0.67 and 0.66 for diameter, height and number of stalks of parcels, TSH and TBH respectively. The coincidence of 68% was found between the families present in cane plant and first ratoon, and of 91% between the families of cane plant and cane plant + first ratoon. The families selected for TBH presented genotypic values approximately 30, 28 and 27% larger than the general mean for each cane plant, cane plant + first ratoon and first ratoon, respectively