Resumo

GUERRERO-GUERRERO, C et al. Genetic behaviour and combining ability in single crosses with inbred lines of forage maize. Universidad y ciencia [online]. 2012, vol.28, n.1, pp.65-77. ISSN 0186-2979.

This study was carried out in two stages: in 2006 with the formation of crosses in the experimental station of the Universidad Autónoma Agraria Antonio Narro Unidad Laguna (UAAANUL) and their evaluation in two localities with three environments in 2007, in the experimental station of the UAAANUL during the spring and summer seasons and in El Niagara, municipality of Aguascalientes, Ags., during the spring. The genetic material used included 24 breeding lines, seven from the programme of the UAAANUL, four from the INIFAP and 13 from the CIMMYT. The objective was to estimate the effects of the general combining ability (ACG) of the breeding lines and the specific combining ability (ACE) of the crosses, as well as to quantify the capacity to inherit and the degree of dominance of the 128 resulting crosses. With respect to the yield of green forage, for the general combining ability (ACG) the male testers B-40 (52.0 t ha^-1), CML-311 (49.0 t ha^-1) and AN-447 (45.2 t ha^-1) stood out, whereas for the specific combining ability (ACE) the highest values were recorded for the crosses B-40xCML-319 (30.8 t ha^-1), B-40xCML-254(30.7 t ha^-1), CML-311xCML-254 (30.0 t ha^-1) and CML-311xCML-319 (29.7 t ha^-1), which were also the best regarding the yield of green forage with 123, 123, 120 and 119 t ha-1 respectively. Among the genetic parameters for yield, the dominance variance was 210, greater than the additive variance of 154, the capacity to inherit was 73% in a broad sense and 30% in a strict sense, and the overdominance was 1.7.

Palavras-chave : Zea mays L.; genetic parameters; genetic material; capacity to inherit.

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