title: Evaluation of genetic divergence among clones of conilon coffee after scheduled cycle pruning.
abstract: Coffea canephora genotypes from the breeding program of Instituto Capixaba de Pesquisa e Extensão Rural were evaluated, and genetic diversity was estimated with the aim of future improvement strategies. From an initial group of 55 genotypes, 18 from the region of Castelo, ES, were selected, and three clones of the cultivars "Vitória" and "robusta tropical." Upon completion of the scheduled cycle pruning, 17 morphoagronomic traits were measured in the 22 genotypes selected. The principal components method was used to evaluate the contributions relative to the traits. The genetic dissimilarity matrix was obtained through Mahalanobis generalized distance, and genotypes were grouped using the hierarchical method based on the mean of the distances. The most promising clones of Avaliação Castelo were AC02, AC03, AC12, AC13, AC22, AC24, AC26, AC27, AC28, AC29, AC30, AC35, AC36, AC37, AC39, AC40, AC43, and AC46. These methods detected high genetic variability, grouping, by similarity, the genotypes in five groups. The trait that contributed the least to genetic divergence was the number of leaves in plagiotropic branches; however, this was not eliminated, because discarding it altered the groups. There are superior genotypes with potential for use in the next stages of the breeding program, aimed at both the composition of clonal variety and hybridizations.
authors.affiliation: Instituto Federal do Espírito Santo, Campus Alegre, ES, Brasil.
authors.forename: J M
authors.initials: JM
authors.lastname: Dalcomo
authors.affiliation: Centro de Ciências e Tecnologias Agropecuárias, Universidade Estadual do Norte Fluminense Darcy Ribeiro, Campos dos Goytacazes, RJ, Brasil.
authors.forename: H D
authors.initials: HD
authors.lastname: Vieira
authors.affiliation: Departamento de Produção Vegetal, Centro de Ciências Agrárias, Universidade Federal do Espírito Santo, Alegre, ES, Brasil.
authors.forename: A
authors.initials: A
authors.lastname: Ferreira
authors.affiliation: Instituto Federal do Espírito Santo, Campus Alegre, ES, Brasil.
authors.forename: W L
authors.initials: WL
authors.lastname: Lima
authors.affiliation: Instituto Capixaba de Pesquisa, Assistência Técnica e Extensão Rural, Vitória, ES, Brasil.
authors.forename: R G
authors.initials: RG
authors.lastname: Ferrão
authors.affiliation: Empresa Brasileira de Pesquisa Agropecuária / Instituto Capixaba de Pesquisa, Assistência Técnica e Extensão Rural, Vitória, ES, Brasil.
authors.forename: A F A
authors.initials: AF
authors.lastname: Fonseca
authors.affiliation: Empresa Brasileira de Pesquisa Agropecuária / Instituto Capixaba de Pesquisa, Assistência Técnica e Extensão Rural, Vitória, ES, Brasil.
authors.forename: M A G
authors.initials: MA
authors.lastname: Ferrão
authors.affiliation: Departamento de Ciências Agrárias e Biológicas, Centro Universitário Norte do Espírito Santo, Universidade Federal do Espírito Santo, São Mateus, ES, Brasil.
authors.forename: F L
authors.initials: FL
authors.lastname: Partelli
mesh_terms: D001947:Breeding; D040503:Coffea / Q000145:classification / Q000235:genetics*; D014644:Genetic Variation; D005838:Genotype; D010641:Phenotype; D010802:Phylogeny; D019655:Quantitative Trait, Heritable