VARIABILITY OF THE CHEMICAL COMPOSITION OF FRUITS OF STRAWBERRY SELECTED HYBRID FORMS

 The paper analysed three-year data (2017–2019) for chemical composition of fruit in promising selected strawberry seedlings (totally-more than 100 forms) from genetical pool of the I. V. Michurin Federal Scientific Center. Average values and the range of variation in the content of the main food and biologically active substances have been determined: soluble solids percentage varies from 8.7–17.0 % (mean 12.4 %), total sugars 5.8–13.2 % (mean 8.8 %), titrable acids — 0.54–1.34 % (mean 0.56 %), ascorbic acid — 44.0–110.4 mg/100 g (mean 72.9 mg/100 g), anthocyanins — 7.3–145.4 mg/100 g (mean 56.8 mg/100 g). In 2019 year the following selected forms 915-104 (298-22-19-21×Feyerverk), 20-8 (Prazdnichnaya×Dedanka), 28-19 (Lakomaya×Maryshka), 921-7 ([(516-167×Cardinal)×Feyerverk); 30-5 (Feyerverk×Privlekatelnaya) are characterized by high sugar accumulation (up to 10.0 %). In 2018 year the high vitamin C content (more over 100.0 mg/100 g) was observed in selected seedlings 914-27, 91459 (Festivalnaya×Privlekatelnaya), 56-9, 56-12 (Gigantella Maxim×Privlekatelnaya); high anthocyanin content (over 100.0 mg/100 g) was demonstrated (in selected seedlings 928-12 (298-19-9-43×Privlekatelnaya), 35-16 (922-67×Maryshka), 25-1 (Rubinovy Kulon×Maryshka), 21-44 (Urozhainaya CGL×Rubinovy Kulon). High and stable content of soluble solids, sugars and optimal acidity of fruit are registered in selected seedlings 26-5 (Rubinovy Kulon×298-19-9-43), 56-9 (Gigantella Maxim×Privlekatelnaya). The selected seedlings 914-9, 914-27 (Festivalnaya×Privlekatelnaya), 25-1 (Rubinovy Kulon×Maryshka), 56-8, 56-9 (Gigantella Maxim×Privlekatelnaya) exhibited the stable level of vitamin C content. High and stable anthocyanin content was confirmed in selected seedlings 914-9, 914-27 (Festivalnaya×Privlekatelnaya), 21-14 (Urozhainaya CGL×Rubinovy Kulon) and 25-1 (Rubinovy Kulon×Maryshka). According to the complex of biochemical characteristics the following selected forms were identified from the hybrid combination Festivalnaya×Privlekatelnaya: 914-27 (ascorbic acid — 90.2 mg/100 g, anthocyanins — 81.6 mg/100 g, sugars — 9.4 %), 914-9 (ascorbic acid — 89.8 mg/100 g, anthocyanins — 90.3 mg/100 g, sugars — 8.4 %). 

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