Resumo

GONZALEZ-TORRES, Anselmo et al. Combining ability and heterosis in hybrids from inbred lines corn. Ecosistemas y recur. agropecuarios [online]. 2017, vol.4, n.11, pp.223-232. ISSN 2007-901X.  https://doi.org/10.19136/era.a4n11.930.

The work was carried out in two stages. In the first, the crosses were formed in the Universidad Autónoma Agraria Antonio Narro Unidad Laguna experimental field (UAAAN-UL), and in the second the evaluation was carried out in the UAAAN-UL experimental field in the spring and summer agricultural cyles, and in the Niagara ejido, in the municipality of Aguascalientes, Aguascalientes, in the spring. The genetic material was 17 inbred lines, four from UAAAN-UL, two from INIFAP and 11 from CIMMYT. The objective was to estimate the general combining ability (GCA) and the specific combining ability (SCA) of the lines, and to quantify the genetic effects and heterosis of the crosses. For GCA, the male lines that stood out were LAN-388P, LB-32 and LB-40, and the female lines were CML-319, CML-318 and CML-278; for SCA, the highest values were obtained by the crosses LAN-123xCML-278 (3.28 t ha-1), LAN-123xCML-318 (1.9 t ha-1), LB-40xCML-319 (1.7 t ha-1) and LAN-388PxCML-264 (1.52 t ha-1), while the best grain yield was obtained by the crosses LB-40xCML-319 (14.49 t ha-1), LB-32xCML-319 (14.17 t ha-1), LAN-388PxCML-264 (13.68 t ha-1), LAN-123xCML-278 (13.55 t ha-1) and LAN-388PxCML-278 (13.44 t ha-1). The dominance variance exceeded the additive variance in grain yield (GY) and in the main yield components. Positive effects of heterosis for grain yield were found with respect to the superior parent in the crosses LB-40xCML-319 and LB-32 x CML-319.

Palavras-chave : Zea mays L.; testers; genetic effects; hybrids; crosses.