Potencial genético de germoplasma elite de feijão carioca para resistência ao mofo-branco

• Ano de defesa: 2019
• Autor(a) principal: Silva, Letícia Iannacone Di Maio
• Orientador(a): Souza, Thiago Lívio Pessoa Oliveira de
• Banca de defesa: Souza, Thiago Lívio Pessoa Oliveira de, Melo, Patrícia Guimarães Santos, Melo, Leonardo Cunha, Silva Filho, João Luis da
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Federal de Goiás
• Programa de Pós-Graduação: Programa de Pós-graduação em Genética e Melhoramento de Plantas (EA)
• Departamento: Escola de Agronomia - EA (RG)
• País: Brasil
• Palavras-chave em Português: Resistência genética; Phaseolus vulgaris; Parâmetros genéticos; Sclerotinia sclerotiorum; Modelos mistos
• Palavras-chave em Inglês: Genetical resistance; Genetical parameters; Mixed models
• Área do conhecimento CNPq: CIENCIAS AGRARIAS::AGRONOMIA::CIENCIA DO SOLO
• Link de acesso: http://repositorio.bc.ufg.br/tede/handle/tede/11079

The common bean (Phaseolus vulgaris L.) represents an important source of protein and fiber on human nutrition and Brazil stands out on the production and consumption of this leguminous, especially those of the carioca market class. The incidence of white mold, one of the most destructive diseases of bean, is among the factors responsible for the reduction of the productivity and the increasing of the production costs, meanly in winter irrigated crops, in which the microclimatic conditions such as mild temperatures and high humidity contribute for a higher proliferation of the disease. There are few cultivars or Brazilian bean elite lines that have partial resistance to the white mold, thus, the objectives of this paper are: (i) to characterize cultivars and elite lines of the carioca bean regarding the reaction to the white mold on the field and in a controlled environment aiming to select resistance sources and (ii) to estimate genetical parameters and number of genes controlling the character for resistance to white mold in a controlled environment utilizing the RILs K-407 × BRS Cometa population. During the characterization of the cultivars and elite lines the field trials were held in Goianira (GO), and Oratorios (MG), and in controlled environment it was utilized the modified straw test. A 1 to 9 visual score scale was utilized for the evaluation of the trials. The data were subjected to statistical analysis utilizing mixed models through REML / BLUP and the best genotypes were selected by their selection coincidence coefficient. Accordingly to the results the elite lineages selected as resistant both in the field and controlled environment were CNFC 16820, CNFC 15875, CNFC 15859 and CNFC 15458, in addition to the cultivars BRS Notável and BRS Sublime. These genotypes could be indicated for growing or as parents with partial resistance to white mold in genetic breeding programs. During the white mold resistance parameters estimation study for the population of RILs BRS Cometa × K-407, 140 RILs on the F9:10 generation were artificially inoculated through the modified straw test and the disease severity was evaluated through a 1 to 9 score scale. It was employed a mixed models methodology to analyze the data. The heritability in the broad sense was moderate (0.60), the calculation of the number of genes indicated the presence of two loci of greater effect controlling the character and the relative coefficient of variation was superior to 1, indicating good experimental precision and favorable situation for the selection.