Parent forms of strawberry Fragaria×ananassa Duch. For breeding on large-fruitfulness

Abstract

The aim of the present work was to identify strawberry Fragaria × ananassa Duch. varieties, valuable for breeding on large-fruitfulness. The research objectives included the assessment of varieties by large-fruitfulness and the identification of sources of this trait, that allows to develop not only large-fruited, but also yielding varieties that are in demand in the market and it will lead to an increase in the production of strawberries, satisfying the population’s demand in poly-vitamin products. 64 varieties of strawberry were studied. The studies were carried out in the department “M. A. Lisavenko Research Institute of Horticulture of Siberia” of “Federal Altai Scientific Center of Agrobiotechnology” in the south of Western Siberia in conditions of a sharply continental climate in 2005-2018. The degree of large-fruitfulness was defined according to the generally accepted method, the assessment of large fruitfulness (average mass of berries) – according to the scale, proposed by N. P. Stolnikova for Siberian conditions. The coefficient of variation was calculated by the method, described by O. V. Masyukova. As a result of studies, it was found that 26 strawberry varieties had an average mass of berries less than 7.0 g, 17 varieties – 7.0-7.9 g, ten – 8.0-8.9 g, nine – 9.0-9.9 g, two – more than 10 g. The variability of large-fruited trait of the studied varieties seemed to be significant almost in all varieties, except for Alena and Zvezdochka varieties, in which the variability was insignificant and the coefficient of variation was 8.1-9.3 %. At Yaponka variety, the variability was average, the coefficient of variation was 13.9 %. For use in breeding the varieties Pervoklassnitsa and Tsunami with very large (12.8 and 10.3 g, respectively) and the varieties with large berries Alena, Atlas, the Bulgarian velikan, Bylinnaya, Vengerka, Vesper, Geyser, Yaponka (9.0-9.9 g and 10 varieties (8.0-8.9 g) were selected. It is necessary to use such strawberry varieties as sources of large-fruitfulness, which have a large-fruited degree of 5 points, 25 varieties turned out to be with this parameter. The parent forms selected for breeding turned out to be adapted to weather conditions during fl owering and ripening of berries, to recurrent spring frosts.