Resumen

DI SANTO, H et al. La aptitud combinatoria específica en el maíz (Zea mays L. ssp. mays) para doble propósito en Río Cuarto, Córdoba, Argentina. BAG, J. basic appl. genet. [online]. 2012, vol.23, n.2. ISSN 1852-6233.

The dual purpose maize is useful in mixed farming establishments because they are suitable to the purposes of grain crop and direct or deferred feed for livestock. A breeding plan to improve land maize populations for forage use is carried out at the National University of Río Cuarto. The aim of this work was to determine the Specific Combining Ability of inbred lines through the productive performance of their single-cross hybrids. A diallel cross was performed, and eighteen traits of the single cross hybrids were studied during three years. A completely randomized block design with three replicates was used, and ANOVA for data analysis was carried out. Specific combining ability trials showed significant positive values for most traits. This allowed identifying and classifying single-cross hybrids according to their potential usability. Seven single-cross hybrids were chosen: one for dual purpose aptitude, three for grain yield or high deferred forage production and three for silage in milk-dough grain stage. It is considered necessary to confirm the performance and productivity of promising single-cross hybrids varying regional environments and agronomic conditions set against commercial simple cross hybrids to verify the production potential and stability.

Palabras clave : Maize; Inbred lines; Single cross-hybrids; Agronomic uses.

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