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The Scientific World Journal
Volume 2014 (2014), Article ID 540152, 7 pages
http://dx.doi.org/10.1155/2014/540152
Research Article

Estimates for Genetic Variance Components in Reciprocal Recurrent Selection in Populations Derived from Maize Single-Cross Hybrids

1DuPont do Brasil S.A., Divisão Pioneer Sementes, 73310-970 Brasília, DF, Brazil
2Departamento de Biologia (DBI), Universidade Federal de Lavras (UFLA), Lavras, MG, Brazil
3Embrapa Cocais, São Luis, MA, Brazil
4Embrapa Semi-Árido, Sobradinho, CE, Brazil
5Departamento de Agricultura (DAG), Universidade Federal de Lavras (UFLA), Lavras, MG, Brazil

Received 8 February 2014; Accepted 21 May 2014; Published 9 June 2014

Academic Editor: Daoxin Xie

Copyright © 2014 Matheus Costa dos Reis et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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 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 ( ) and the covariance between these and their intrapopulation additive effects ( ) 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.