Abstract

PALEMON ALBERTO, Francisco et al. Intervarietal maize crosses for the semi-warm region of Guerrero, México. Rev. Mex. Cienc. Agríc [online]. 2011, vol.2, n.5, pp.745-757. ISSN 2007-0934.

The topography and agro-ecology of the Guerrero State is diverse and in agricultural areas of intermediate elevation (1 200 to 1 700 m), almost no improved varieties are planted, due to unfavorable climatic and soil conditions, so it is difficult to establish a maize breeding program for every ecological niche. In these regions, the stability of 25 maize varieties was examined, during five summer-autumn crop seasons from 2005 to 2009; aiming to identify an intervarietal cross that was stable, consistent and with good yield potential through the environments. The data was analyzed in 20 varieties, using a randomized complete block design with three replications by location and combining locations. Using this information, the stability parameters proposed by Eberhart and Russell, and described by Molina were estimated, also the additive main effects and multiplicative interaction model (AMMI) was applied. The V15 and V16 male parents showed stability and consistency through the environments; a similar behavior was shown by V3, V7 and V9 intervarietal crosses, they were also outstanding in grain yield; V11 was consistent and showed greater production potential in unfavorable environments. Intervarietal crosses V1, V4, V6, V10, farmer's local variety V13 and female parents V17, V18 and V20, showed good response in favorable environments but were also inconsistent. The two methods used, showed similar results; so, it was possible to select three varieties by its grain yield potential, stability, and consistency in environments.

Keywords : Zea mays L.; grain yield; tropical and subtropical varieties.

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