Abstract

LAURENTIN, Hernán; MONTILLA, Daniel  and  GARCIA, Vicente. Relación entre el rendimiento de ocho genotipos de ajonjolí (Sesamum indicum L.) y sus componentes: Comparación de metodologías. Bioagro [online]. 2004, vol.16, n.3, pp.152-162. ISSN 1316-3361.

To assess the relationship between sesame yield and yield components such as plant height, number of capsules per plant, number of branches per plant, total fructification length, capsule length and 1000-seed-weight, eight field assays settled around Turén, Portuguesa State, Venezuela, were evaluated. A randomized complete block design, with four replications and eight treatments (eight sesame genotypes) was used at each assay. The evaluation was performed by means of genotypic and phenotypic correlation analysis, regression analysis, pathway coefficients, and principal components. Number of branches per plant and total fructification length were the variables that showed the greatest phenotypic and genotypic correlation with yield. Regression analysis identified number of branches and capsules, weight of 1000 seeds and capsule length as the most important variables in the regression model; however, it showed a small determination coefficient. Pathway analysis identified the weight of 1000 seeds and number of branches as the variables with the most important direct effect on yield; however, they had negative indirect effects each other. Principal components analysis was useful to discriminate the genotypes with poor yield, but it was unable to separate the genotypes with the highest yield. The results indicate that it is possible an indirect selection toward high yield by selecting plants with high 1000 seed weight or with high number of branches per plant.

Keywords : Selection index; genotypic correlation; path coefficients; principal components.