Caracterização molecular de linhagens de milho tropical por marcadores microssatélites

• Ano de defesa: 2010
• Autor(a) principal: Lanes, Éder Cristian Malta de
• Orientador(a): Miranda, Glauco Vieira
• Banca de defesa: Motoike, Sérgio Yoshimitsu , Cruz, Cosme Damião
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Federal de Viçosa
• Programa de Pós-Graduação: Mestrado em Genética e Melhoramento
• Departamento: Genética animal; Genética molecular e de microrganismos; Genética quantitativa; Genética vegetal; Me
• País: BR
• Palavras-chave em Português: Diversidade; Milho; Microssatélite
• Palavras-chave em Inglês: Diversity; Maize; Microsatellite
• Área do conhecimento CNPq: CNPQ::CIENCIAS AGRARIAS::AGRONOMIA::FITOTECNIA::MELHORAMENTO VEGETAL
• Link de acesso: http://locus.ufv.br/handle/123456789/4746

Knowledge of genetic diversity (GD) and relationships among maize inbred lines may allow characterization of the germplasm sort the genotypes into distinct heterotic groups, and this information is important in the choice of parents to obtain hybrids with high heterosis and increased grain yield. Our objectives in this study were (1) investigate the genetic diversity among tropical maize inbred lines from the germplasm collection of Maize Program® UFV,(2)estimate the potential informativeness of the SSR loci studied in maize inbred lines and (3) investigate the presence of alleles present in groups of strains belonging to different companies for improvement. The genetic similarity between all pairs of strains (ii ') were calculated by the weighted index, and for calculating the dissimilarity measure (Dii') we used the arithmetic complement (Dii'= 1 - S ii'). In total, 471 SSR alleles were identified, with an average of 5.81 alleles per locus. The average polymorphism information content (PIC) was 0. 5733. The genetic dissimilarity between strains ranged from 0.19 to 0.67, with an average of 0.49. Cluster analysis by the Tocher and UPGMA method was efficient in grouping inbred lines, suggesting a total of eighteen groups. Most of the inbred lines were consistent with its origins, although with some discrepancies. The pattern of groupings of the inbred lines revealed that there is ample genetic base among the majotity of inbred lines. The plausible ample genetic base among the majotity of inbred lines. The plausible explanation is that these were derived from different heterotic groups. The variability detected in the groups formed by SSR loci may contribute to the efficient use of inbred lines for exploitation of heterosis and broadening the genetic base of the program. The variability detected in the small number of groups formed by SSR loci may contribute to the effective use of inbred lines for the exploitation of heterosis and broadening the genetic base of the program.