title: Inbreeding depression in single, three way and double-cross hybrids of maize.
abstract: Currently, one of the acclaimed alternatives for increasing maize yield is accomplished through utilization of heterosis in hybrid cultivars. However, upon performing crosses between related pairs, there are losses due to inbreeding depression. Thus, the aim of this study was to estimate inbreeding depression and the contribution of loci in heterozygosity in different types of maize hybrids. Eight treatments were evaluated, considering the F1and S0generations of four commercial hybrids. A randomized block experimental design was used, with three replications, and plots consisting of two three-meter long rows at a spacing of 0.50 m. The traits evaluated were plant height, first ear height and husked ear weight. For ear weight trait, there was a significant difference, where the treatments could be classified into three distinct groups. In this case, the single-cross hybrids AG7088 and 30F90Y exhibited greater depression through inbreeding due to the greater contribution of loci in heterozygosity and consequent predominance of deviations due to dominance.
authors.affiliation: Departamento de Agricultura, Universidade Federal de Lavras, Lavras, MG, Brasil flaviabotelho@dag.ufla.br.
authors.forename: F B S
authors.initials: FB
authors.lastname: Botelho
authors.affiliation: Departamento de Agricultura, Universidade Federal de Lavras, Lavras, MG, Brasil.
authors.forename: A T
authors.initials: AT
authors.lastname: Bruzi
authors.affiliation: Departamento de Agricultura, Universidade Federal de Lavras, Lavras, MG, Brasil.
authors.forename: I P
authors.initials: IP
authors.lastname: Lima
authors.affiliation: Departamento de Biologia, Universidade Federal de Lavras, Lavras, MG, Brasil.
authors.forename: C S
authors.initials: CS
authors.lastname: Rodrigues
authors.affiliation: Universidade Federal de Lavras, Lavras, MG, Brasil.
authors.forename: R T
authors.initials: RT
authors.lastname: de C Botelho
mesh_terms: D003433:Crosses, Genetic; D056426:Genetic Loci; D006579:Heterozygote; D006824:Hybridization, Genetic; D000071422:Inbreeding Depression / Q000235:genetics*; D012987:Soil; D003313:Zea mays / Q000033:anatomy & histology / Q000235:genetics*
chemical_list: D012987:Soil