Abstract
The most efficient breeding strategies in crop improvement is the selection based on heritability and combing ability estimates for the traits of economic importance or commercial value. Therefore, the present study was to obtain estimates of heritability and to estimate the phenotypic and genotypic correlations among the characteristics of interest. The commercial cultivars ‘Aromas’, ‘Camarosa’, ‘Dover’, ‘Festival Flórida’, ‘Oso Grande’, ‘Sweet Charlie’ and ‘Milsei-Tudla’, and 103 F1 hybrids from the crossbreeding experiments were evaluated for four traits of commercial fruit yield and 13 traits of fruit physical and chemical quality. The estimated genetic parameters were general combining ability, specific combining ability, genotypic correlation among traits, estimates of heritability, genetic and phenotypic variance. The ‘Camarosa’ and ‘Aromas’ cultivars were the most promising cultivars for use as parents in the commercial fruit production, while ‘Dover’ and ‘Sweet Charlie’ cultivars were selected for taste of fruit in strawberry breeding, as they showed higher concentrations of favorable alleles in the F1 hybrid population. It was also verified some strong genetic correlations for some pairs of characteristics in the present study that may allow indirect selection. The estimation of these parameters is an important basis for decision making on the genetic engineering of strawberry.
Highlights
The strawberry (Fragaria × ananassa Duch.) a fruit crop that belongs to the family Rosaeceae and the genus Fragaria, presenting 35 described and 11 natural species
The greater accuracy of the selection, the greater will be the heritability of a characteristic and the greater the response to the selection
The broad sense heritability values were medium to high. It is expected higher genetic gains in the selection of traits Total mass (TM), and number of commercial fruits (NCF) related to fruit production, Total soluble solids (TSS)/Titratable acidity (TA) for fruit flavor, IS and external staining (ES) for fruit marketability, where high heritability values were observed
Summary
The strawberry (Fragaria × ananassa Duch.) a fruit crop that belongs to the family Rosaeceae and the genus Fragaria, presenting 35 described and 11 natural species. The selection of superior individuals has been mostly based on the phenotypic evaluation of individuals from a given generation. The success in selection is associated with the degree of genetic variance in subsequent generations (Falconer, 1987). The genetic-additive variance estimators were described in Falconer (1987), and Cruz and Carneiro (2003), δ2A = 4δ2M when we consider absence of epistasis and inbreeding population (F = 0). From the values of the mean squares, obtained by the analysis of variance of the data of Miracema and Viçosa, the variance component associated with the male effect was estimated (δ2M), as described in Falconer (1987), Cruz and Carneiro (2003), and Gonçalves (2005)
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