Breeding strategies for recurrent selection of maize

Abstract

-The objectives of this work were to analyze theoretical genetic gains of maize due to recurrent selection among full-sib and half-sib families, obtained by Design I, Full-Sib Design and Half-Sib Design, and genotypic variability and gene loss with long term selection. The designs were evaluated by simulation, based on average estimated gains after ten selection cycles. The simulation process was based on seven gene systems with ten genes (with distinct degrees of dominance), three population classes (with different gene frequencies), under three environmental conditions (heritability values), and four selection strategies. Each combination was repeated ten times, amounting to 25, 200 simulations. Full-sib selection is generally more efficient than half-sib selection, mainly with favorable dominant genes. The use of full-sib families derived by Design I is generally more efficient than using progenies obtained by Full-Sib Design. Using Design I with 50 males and 200 females (effective size of 160) did not result in improved populations with minimum genotypic variability. In the populations with lower effective size (160 and 400) the loss of favorable genes was restricted to recessive genes with reduced frequencies.

Efficiency of different breeding strategies in improving the faba bean productivity for sustainable agriculture

“…Recurrent selection has been used to improve cross-pollinated crops, especially to improve the performance of maize populations (Viana 2007). It has also been shown to be efficient in improving rice productivity (Morais Júnior et al 2017).…”

Genetic Parameters and Predictive Genetic Gain in Maize with Modified Recurrent Selection Method

“…Therefore, this method of selection is designed for use in the medium to long term. The plant population must have genetic variability in the most important traits, with magnitudes that are consistent with the targets required in the program (Souza Jr., 2001;Viana, 2007).…”