Abstract

DOMINGUEZ, M.  and  GONZALEZ, Julio. Heredabilidad, correlaciones genéticas, análisis de sendero e índices de selección en una población de girasol (Helianthus annuus) de la EEA INTA Pergamino. RIA. Rev. investig. agropecu. [online]. 2021, vol.47, n.2, pp.209-215.  Epub Aug 18, 2021. ISSN 1669-2314.

The first step in a breeding program is to develop a population with genetic variability for the traits of interest. The selection of progenies from populations is a valuable tool for breeding. The germplasm studied comes from the cross of the Bulk Vert Composite, formed by the recombination among maintainers inbred lines resistant to Verticillium dahliae, and the Bulk AO Composite, originated by the recombination among maintainers inbred lines of high oleic acid content. This cross developed the Bulk Vert x Bulk AO population of the National Institute for Agriculture Research (INTA) Pergamino formed by local and exotic germplasm. The main goal of the breeding of the population is to derive inbred lines to obtain hybrids and the specific aims were to evaluate the heritability and associations between agronomic traits in families S0:1 of Bulk Vert x Bulk AO population, the genetic progress expected by selection, determine the influence of the traits studied on yield and evaluate the use of selection indices for the improvement of the population. The traits evaluated were oil content, plant height, days to flowering, stem diameter, capitulum diameter, number of achenes per capitulum, weight of 100 achenes and yield of achenes per plant. The results show the variability existing in the population, observing differences between families for all the traits. The number of achenes per capitulum should be considered as selection criteria for obtaining genotypes with higher yield. The use of selection indices in this population would obtain greater responses than expected by selection of single traits. The application of selection strategies on this population would allow progress in the breeding of traits related to yield and oil content.

Keywords : breeding; population; genetic variability; sunflower; Helianthus annuus; heritability.

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