Predicting the potential of open-pollinating populations for the production of superior F1 hybrids

Abstract

The distributive properties of a single population or of a population resulting from a cross between two populations are reproduced when inbreds randomly extracted from the population itself or from the two parental populations are randomly paired. Hence, population parameters that are usually obtained during a breeding programme can be used to predict the performance of the F1 hybrids that can be derived from them at that stage. Multiple allelism, epistasis and deviations from Hardy-Weinberg equilibria should not cause biasis to the predictions. While in theory genotype x environment interaction and linkage disequilibrium may disturb the predictions, in practice they are unlikely to create problems that cannot be accommodated. Genotypic and phenotypic predictions of the proportions of the F1 hybrid distribution scoring above or below a given standard are made and analysed for three characters, weight of the ears, plant height and height of the ear, in two populations of maize per se and their interpopulational cross. Because no random inbred lines from the experimental populations are presently available we cannot check our predictions. However, genotypic and phenotypic predictions and observations of F1 hybrids obtained from populations created by computer simulation are provided to illustrate our procedures.

Genetic progress after cycles of upland rice recurrent selection

“…The method of Jinks and Pooni (1976) allows for estimating the potential, given the mean and genetic variance of early generations, with examples in rice , common bean (Abreu et al, 2002), maize (Toledo and Miranda Filho, 1985), soybean (Toledo, 1987;Triller and Toledo, 1996) and wheat (Snape, 1982).…”

Genetic Analysis of Tropical Midaltitude‐Adapted Maize Populations under Stress and Nonstress Conditions

“…With extraction of inbred lines from population hybrids formed using improved populations, there is a possibility that inbreeding depression, which hampers inbred line development from local OPVs, will be minimized. Inbred lines extracted from populations such as ECAVL2 that produced high-yielding population hybrids could be used for the prediction of potential superior F 1 hybrids (Toledo and Miranda Filho, 1985). In addition, a population such as ECAVL2 could be used to transfer favorable alleles to improve other populations (Dudley, 1988).…”