title: Estimates for genetic variance components in reciprocal recurrent selection in populations derived from maize single-cross hybrids.
abstract: This study was carried out to obtain the estimates of genetic variance and covariance components related to intra- and interpopulation in the original populations (C0) and in the third cycle (C3) of reciprocal recurrent selection (RRS) which allows breeders to define the best breeding strategy. For that purpose, the half-sib progenies of intrapopulation (P11 and P22) and interpopulation (P12 and P21) from populations 1 and 2 derived from single-cross hybrids in the 0 and 3 cycles of the reciprocal recurrent selection program were used. The intra- and interpopulation progenies were evaluated in a 10 × 10 triple lattice design in two separate locations. The data for unhusked ear weight (ear weight without husk) and plant height were collected. All genetic variance and covariance components were estimated from the expected mean squares. The breakdown of additive variance into intrapopulation and interpopulation additive deviations (σ τ (2)) and the covariance between these and their intrapopulation additive effects (Cov Aτ) found predominance of the dominance effect for unhusked ear weight. Plant height for these components shows that the intrapopulation additive effect explains most of the variation. Estimates for intrapopulation and interpopulation additive genetic variances confirm that populations derived from single-cross hybrids have potential for recurrent selection programs.
authors.affiliation: DuPont do Brasil S.A., Divisão Pioneer Sementes, 73310-970 Brasília, DF, Brazil.
authors.forename: Matheus Costa
authors.initials: MC
authors.lastname: dos Reis
authors.affiliation: Departamento de Biologia (DBI), Universidade Federal de Lavras (UFLA), Lavras, MG, Brazil.
authors.forename: José Maria Villela
authors.initials: JM
authors.lastname: Pádua
authors.affiliation: Embrapa Cocais, São Luis, MA, Brazil.
authors.forename: Guilherme Barbosa
authors.initials: GB
authors.lastname: Abreu
authors.affiliation: Embrapa Semi-Árido, Sobradinho, CE, Brazil.
authors.forename: Fernando Lisboa
authors.initials: FL
authors.lastname: Guedes
authors.affiliation: Departamento de Agricultura (DAG), Universidade Federal de Lavras (UFLA), Lavras, MG, Brazil.
authors.forename: Rodrigo Vieira
authors.initials: RV
authors.lastname: Balbi
authors.affiliation: Departamento de Biologia (DBI), Universidade Federal de Lavras (UFLA), Lavras, MG, Brazil.
authors.forename: João Cândido
authors.initials: JC
authors.lastname: de Souza
mesh_terms: D000704:Analysis of Variance; D002678:Chimera / Q000235:genetics*; D014644:Genetic Variation / Q000235:genetics*; D012641:Selection, Genetic / Q000235:genetics*; D003313:Zea mays / Q000235:genetics*