Genetic effects of maize inbred lines resistance to Helminthosporium turcicum Pass

Abstract

Two S₃ maize inbreds, one resistant and the other susceptible to Helminthosporium turcicum, as well as their F₁, F₂ and backcrosses, were studied in optimal conditions for the development of the pathogen. The six families were evaluated in a randomized complete block experiment with four replications in Campinas, SP, Brazil. Data indicated that in this germoplasm, resistance to Helminthosporium turcicum was apparently of polygenic type with predominantly non-additive effects.