Viability of the use of inbred progenies in recurrent selection in perennial plants

Abstract

The viability of using inbred progenies, i.e., S 1 or S 2 , in recurrent selection programs for perennial plants was evaluated in comparison with full sibs using the expression of gain from selection. Populations with different genetic properties, were considered in obtaining the estimates, with the population genetic variance always equal to 1 used as reference, as well as different experimental strategies. The estimates of genetic covariances between average additive effects of the alleles and the dominance effects of homozygotes, which occur when S 1 or S 2 is used, although negative for the lower values of the average allele frequencies, were always smaller than the additive genetic variance. Per unit of time, the total gain from selection with S 1 was greater than with S 2 and full sibs. However, it is argued that the best strategy is a cycle with S 1 , followed by a cloned progeny test with full sibs.

Powdery Mildew of Bigleaf Hydrangea: Biology, Control, and Breeding Strategies for Resistance

“…These F1 selections are then intercrossed (recurrent selection) or crossed to the resistant parent (backcrossing). In these strategies, the mean number of favorable alleles increases in each generation, and plants may be selected based on the trait only or using an index that combines the trait and other ornamental characteristics [96]. Selection usually happens in the F1 generation because hydrangeas are not self-fertile and will not readily produce production-quality F2 plants.…”