The objective of this work was to get information about the genetic control of the grain yield under heat stress conditions, the tolerance of cultivar and the identification of promising segregation populations for selections of lines adapted to the conditions of the central region of Brazil. Thirteen parents and 40 populations in F1 and F2 generations derived by partial diallel crosses were evaluated. The experiments were conducted under field conditions in Lavras and Patos de Minas, MG, Brazil, sowing the seeds in the summertime (February) and in the winter (May). There was difference of heat tolerance among parents and hybrid populations for grain yield character, and both additive and non-additive effects were important in the genetic control of grain yield character in the presence or absence of heat. In spite of the occurrence of populations x sowing time interactions, the high repeatability of the effects of the general combining ability suggests the possibility of the selection in the summertime and winter facilitating to advance the breeding programs in the region.
Triticum aestivum; diallel crossing; breeding methods
