ESTIMATION OF GENOTYPIC GAIN THROUGH SELECTION IN SEGREGATING GENERATIONS OF OAT

Abstract

In the selection of superior genotypes, it searches to develop the maximum genetic profit and this to attribute the evaluated traits, in the next cycle of selection, a bigger potential. For thus, it is interesting that the breeder by the genetic improvement knows the efficiency that can be reached when any method of selection in segregating populations is used. Thus, the present work was proposed with the objective of determining the genetic profit considering the differential of estimated selection and the heritability in agronomics traits and quality of grain through selection carried out in segregating generations. The experiment was held in Pato Branco, Brazil, in the southwest region of Paraná State, during the year of 2001. The performed studies have involved the traits vegetative cycle, stature of plant, weight of panicle, number of grains/panicle, average weight of grains and percentage of caryopses in four white oats crossing, UPF 7 X OR 2, UPF 7 X CTC 5, OR 2 X CTC 5 e OR 2 X UPF 18. The heritability coefficients have presented bigger values for the traits vegetative cycle (0,60), average weight of grains (0,68) and percentage of caryopses (0,40). The differential selection was more expressive for the traits directly to the production of grains and, together with the values of heritability, have resulted in high genetic profit considering that the same ones represent a single cycle of selection.