Resumen

AVENDANO ARRAZATE, Carlos Hugo et al. drought resistance Selection response in corn (Zea mays L.). INCI [online]. 2009, vol.34, n.11, pp.801-807. ISSN 0378-1844.

The response to masal selection for components of grain yield, and stability, were studied in two original varieties of corn, Zacatecas 58 and Cafime, in which 19 and 16 cycles of masal selection for drought resistance were applied, respectively. Both genetic materials were evaluated in two localities (Montecillo and Tecámac, State of Mexico) in three soil moisture environments (irrigation, rainfall and drought). The genetic advance estimates for a selection cycle and the stability parameters used indicate that in the drought environment the highest genetic advances in a cycle were found for both varieties, but the largest accumulated profit in units for the evaluated traits, was obtained under irrigation conditions. The selection compounds of the Cafime variety were more consistent than those of Zacatecas 58. In both varieties, the ear corn average weight increased as the selection cycle number increased and, thus, the coefficient of regression also increased. It is deduced that an increase of visual masal selection increases the yield and the environmental linear sensibility (b_i), but not the environmental nonlinear sensibility (S²d_i). Finally, the yield increase and its components were positively correlated with the linear regression coefficient of the yield concerning the selection cycles number, but there was no correlation with the regression deviation.

Palabras clave : Avance Genético ; Cafime ; Maíz ; Parámetros de Estabilidad ; Sequía ; Zacatecas 58 .