Hybrid performance and heterosis in strawberry (Fragaria × ananassa Duchesne), regarding acidity, soluble solids and dry matter content in fruits

Abstract

A top-cross-mating design among 29 S 4 inbred lines and tester (cultivar 'Dukat') was carried out to study their breeding value in terms of general combining ability (GCA). The objectives of this study were to evaluate the acidity, soluble solids and dry matter contents in fruits of progeny F 1 in comparison with S 4 inbred lines as well as the cultivars (S 0 ); identify strawberry genotypes with high value of GCA for use in cultivar development; and determine mid-parent heterosis regarding S 4 inbred lines and cultivated strawberry. The 2-year observations showed statistically significant differences between tested genotypes in terms of the studied traits. The highest breeding value based on GCA was estimated for Chandler 123-5 for soluble solids and dry matter content, and Kent 7-6 for acidity. Estimated mid-parent heterosis had positive and negative values. The highest heterosis in terms of extract and dry matter content (26.71% and 17.50%, respectively) occurred in the offspring Chandler 123-5 9 'Dukat', but as regards acidity in hybrid Chandler 123-22 with cv. 'Dukat'. The study of genetic divergence by dendrograms may help to identify parents suitable for obtaining hybrids with higher heterosis effects.

General combining ability and heterosis regarding the phytochemical properties in strawberry (Fragaria × ananassa) hybrids

“…A similar relationship was observed in studies conducted by Kaczmarska et al. () regarding acidity, soluble solid and dry matter content in fruit. This indicates the usefulness of estimating the GCA effects for predicting the effects of heterosis.…”

“…As in the previous studies (Kaczmarska et al. ), the highest negative GCA effects for all the studied traits were obtained for clone 1387 18‐4. The breeding value of the parental strawberry cultivars was investigated by Masny et al.…”

“…The way of getting inbred lines and top‐cross progeny, the conditions of the experiment and pedigree of cultivars has been previously described by Kaczmarska et al. (). Based on vigour and yield of plants, six strawberry cultivars (‘Senga Sengana’, ‘Kent’, ‘Chandler’, ‘Teresa’, ‘Dukat’, clone 1387) and 15 of the best F 1 hybrids were selected for this study.…”

A Specific Gibberellin 20-Oxidase Dictates the Flowering-Runnering Decision in Diploid Strawberry

“…As shown here, this has considerable influence on strawberry productivity in both seasonal flowering and perpetual flowering strawberry genotypes. Due to strong inbreeding depression (Kaczmarska et al, 2016), it is necessary to produce daughter plants in order to vegetatively propagate strawberry varieties, hence excluding the commercial use of strict runnerless mutants. It is technically feasible to use bioactive GAs and GA inhibitors to modulate runnering/flowering (Hytönen et al, 2008), but such products are currently not registered for commercial use for vegetative propagation in many countries.…”

“…A major representative of these crop species is potato (Solanum tuberosum), in which tubers are storage organs derived from an underground stolon (elongated stem). In strawberry (Fragaria spp), a major fleshy fruit-bearing crop that undergoes inbreeding depression (Darrow, 1929;Kaczmarska et al, 2016), daughter plants or ramets (clonal plants) produced from an aerial stolon (runner) are essential for the clonal propagation of commercial varieties.…”