Abstract

GONZALEZ MARTINEZ, Javier et al. Heterosis and genetic parameters in lines derived from native populations in tropical corn Tamaulipas. Rev. Mex. Cienc. Agríc [online]. 2016, vol.7, n.2, pp.387-399. ISSN 2007-0934.

The effects of general combining ability (ACG) and specific (ACE) for grain yield and its components was determined, in addition to estimating the degree of dominance, heterosis and heritability, in order to identify and assess heterotic patterns among corn inbred lines developed from native germplasm of central and southern Tamaulipas. The 30 direct and reciprocal crosses and their parents were evaluated in Güemez and Rio Bravo, Tamaulipas state, during the autumn-winter 2012-2013 cycle. The experimental unit consisted of a row of 5 m in length, with a row spacing of 0.8 m and 0.25 m between plants. Evaluations were established in a randomized complete design with three replications blocks. Grain yield (RGha), ear length (LMZ), ear diameter (DMZ), number of grains per ear (NGM), plant height (AP), single grain weight (PIG) and length were measured at flowering male (DFM). To estimate the effects of ACG and ACE, was used I Griffing method. The results of combined analysis showed significant differences for genotypes. The L1, L2, L4, L5 and L6 parents were involved in the best crosses for grain yield, while a cross L1 × L5, L2 × L4 and L5 × L6 showed positive effects of heterosis and ACE. The crosses L4 × L3, L4 × L5, L5 × L4, L5 × L6, L6 × L4, L6 × L5 yields showed above average grain. Additive effects were the main component for the expression of the variables evaluated.

Keywords : Zea mays L.; combining ability; diallel; native germplasm.

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