Genetic parameters of a maize population in contrasting nitrogen levels

The aim of this study was to characterize a maize population through the genetic parameters in high and low nitrogen availability. Thus, the experiment was conducted in a randomized block design with 162 lines in two contrasting environments in nitrogen availability in a factorial design with three replications. The population showed genetic variability for grain yield in low nitrogen, reducing the ear height, chlorophyll content, the number of ears, ear weight and grain yield in relation to the environment without stress. The coefficient's genetic correlation between grain yield and other characteristics vary according to levels of nitrogen applied. The number of ears showed high genetic correlation with grain yield under stress and high heritability compared with obtained under a high nitrogen, thus enabling its use for indirect selection of yield lines of maize grown under nitrogen stress.

Nitrogen; Corn (Zea mays L.); Abiotic stress; Heritability