Estimativas de parâmetros genéticos e fenotípicos no cajueiro anão precoce para antracnose e mofo preto

• Ano de defesa: 2009
• Autor(a) principal: Sousa, Tomil Ricardo Maia de
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Palavras-chave em Português: Melhoramento genético; Resistência a doenças; Antracnose; Mofo preto
• Link de acesso: http://www.repositorio.ufc.br/handle/riufc/37963

The cashew breeding program various attributes of the is being considered until they realize the selection of a new clone and one of these must be the genetic resistance to disease, but in cashew this attribute is still well known and exploited. However the close genetic base used in the breeding program resulted in problems related to resistance to pathogens, since some of the existing clones is likely present the two main diseases of cashew (anthracnose and black mold). Estimates and understanding of genetic parameters are important in knowledge the genetic structure of the population, the inference of genetic variability in this population, besides providing subsidies to predict the genetic gains and the possible success in the breeding program. The objectives of this work were to estimate genetic parameters in half-sib progenies of early dwarf cashew and performance under these different environments for the characters of resistance to anthracnose and black mold. The study was installed out at the experimental station in the Experimental Field of Pacajus and Experimental Paraipaba, belonging to Embrapa Agroindústria Tropical in March 2007, respectively located in the municipalities of Pacajus and Paraipaba both in the state of Ceará. Evaluations of occurrence and severity of diseases: anthracnose and black mold, using a scale of grades 0 to 4. In Pacajus there were negligible amounts of heritabilities for the anthracnose severity, reaching a value of 29.4% for severity of black mold is returned values of up to 73.5%, both for heritability in the progeny, and for Paraipaba for severity of anthracnose, the heritability of results achieved by 65.9% and 71.3% for the heritability within and average, respectively. For severity of black mold values were above 65% for heritability. Estimates of genetic parameters in the study have significant values to anthracnose and black mold, indicating presence of significant genetic variance among the released progenies of cashew. The selection between and within progenies should lead to higher earnings for severity of anthracnose and black mold.