title: Multivariate analysis to determine the genetic  distance among backcross papaya (Carica papaya) progenies.
abstract: Morpho-agronomic and molecular (RAPD and ISSR markers)  data were used to evaluate genetic distances between papaya backcross progenies  in order to help identify agronomically superior genotypes. Thirty-two papaya  progenies were evaluated based on 15 morpho-agronomic characteristics, 20 ISSR  and 19 RAPD primers. Manhattan, Jaccard and Gower distances were used to  estimate differences based on continuous and binary data and combined analyses,  respectively. Except for production, there were significant differences in the  continuous variables among the genotypes. The molecular analysis revealed 193  dominant markers (ISSR and RAPD), being 53 polymorphic loci. Among the various  clusters that were generated, the one based on a combined analysis of  morpho-agronomic and molecular data gave the highest cophenetic correlation  (0.72) compared to individual analysis, consistently allocating the progenies  into six groups. We found that the Gower algorithm was more coherent in the  discrimination of the genotypes, demonstrating that a combination of molecular  and agronomic data is valuable for studies of genetic dissimilarity in papaya.
authors.affiliation: Laboratório de Melhoramento Genético Vegetal, Centro de Ciências e Tecnologias Agropecuárias, Universidade Estadual do Norte Fluminense Darcy Ribeiro, Campos dos Goytacazes, RJ, Brasil.
authors.forename: H C C
authors.initials: HC
authors.lastname: Ramos
authors.forename: M G
authors.initials: MG
authors.lastname: Pereira
authors.forename: L S A
authors.initials: LS
authors.lastname: Gonçalves
authors.forename: A P C G
authors.initials: AP
authors.lastname: Berilli
authors.forename: F O
authors.initials: FO
authors.lastname: Pinto
authors.forename: E H
authors.initials: EH
authors.lastname: Ribeiro
mesh_terms: D000465:Algorithms; D029441:Carica / Q000235:genetics*; D003433:Crosses, Genetic; D005819:Genetic Markers; D015999:Multivariate Analysis; D019105:Random Amplified Polymorphic DNA Technique
chemical_list: D005819:Genetic Markers