Purpose. The adaptation of regenerant plants to environmental conditions is the final stage of micropropagation. According to a number of authors, when in vitro plants are transferred to in vivo non-sterile conditions, a significant percentage of mortality is recorded. In a previous publication, the regenerative capacity of strawberry (Fragaria vesca L.) in vitro tissues on MS culture medium (Murashige & Skoog, 1962) and a regenerants was obtained (Chornobrov O. Yu., 2019). The objective of the study is to develop an optimal protocol of acclimation of in vitro F. vesca plants to in vivo conditions. Methods. Biotechnological and statistical methods of research were applied. For the research ‘Ruiana’ and ‘Zhovte Dyvo’ cultivars were used with in vitro cultivation cycle of 30–35 days. Prepared plants were planted in 0.33 L plastic contai ners, one piece in a mixture of coconut substrate and perlite (3:1). Plants were kept under high relative humidity (85–90%) conditions for 3–5 days, 6–8 days and 10–14 days. The studies were carried out in the Plant Biotechnology Laboratory of SS of NULES of Ukraine “BFRS” during 2019–2020. Results. The duration of Fragaria vesca regenerant plants exposure in conditions of high relative humidity significantly affected adaptation efficiency. The proportion of ‘Ruiana’ and ‘Zhovte Dyvo’ plants adapted to the greenhouse conditions were 47.6 ± 2.5% and 60.0 ± 1.7%, respectively, when the plants were kept for 10–14 days. A significant efficiency of plant adaptation (more than 70%) was obtained under condition of preliminarily exposure the roots of the plants in an auxin solution for 25–30 minutes with daily application of 30% solution of glycerine as foliar spray. The plants adapted to the greenhouse conditions had pigmentation characteristic of the variety, without signs of chlorosis and vitrification. Conclusions. An optimal protocol for in vitro adaptation of F. vesca cultivars to in vivo conditions was developed and viable plants were obtained. Further research will be aimed at studying the growth and development of F. vesca regenerant plants in open ground.

Purpose. To study the features of the productivity formation of broccoli hybrids depending on the methods of application of “5 element” nanofertilizer in the conditions of the Western Forest-Steppe of Ukraine. Methods. Field, laboratory, statistical. Results. With the introduction of “5 element” nanofertilizer, the head diameter of the ‘Batavia F1’ hybrid increased from 16.6 (var. 2) to 18.3 cm (var. 8), while in the control this indicator was 15.9 cm. The biggest head diameter in the hybrid ‘Orantes F1’ 18.9 and 18.7 cm was noted with foliar feeding with “5 element” nanofertilizer in the phase of 4–6 leaves + beginning of head formation + 10–12 days after the beginning of head formation and in the phase of the beginning of head formation + 10–12 days after the beginning of head formation. Accordingly, in the aforementioned variants, the head mass was 901 and 863 g, which is higher than the control (without treatment) by 166 and 128 g, or 22.3 and 17.4%.The highest yield of the ‘Batavia F1’ hybrid was obtained in 8 and 7 variants of the experiment – 33.5 and 31.9 t/ha, respectively, the yield increase was 5.2 and 3.6 t/ha, or 18.4 and 12.7%. In the hybrid ‘Orantes F1’ the highest yield (37.1 t/ha) was recorded when applying the “5 element” nanofertilizer in the 8th variant of the experiment, which is 6.6 t/ha higher than the control, or 21.6%. Compared to the ‘Batavia F1’ hybrid, the yield in this variant of the ‘Orantes F1’ hybrid was 3.6 t/ha, or 9.7%. The diameter and weight of the head, as well as the yield of the hybrid ‘Orantes F1’ were larger compared to the hybrid ‘Batavia F1’, due to its biological characteristics. A strong correlation (r = 0.97 and 0.96) was revealed between the yield and the diameter of the broccoli head in the ‘Batavia F1’ and ‘Orantes F1’ hybrids. The quality indicators of broccoli (dry matter, sum of sugars and vitamin C) in the ‘Orantes F1’ hybrid were higher compared to the ‘Batavia F1’ hybrid. A tendency towards a decrease in the concentration of nitrates in the heads of broccoli with an increase in the number of treatments with nanofertilizer “5 element” was revealed. The concentration of nitrates in the ‘Orantes F1’ hybrid was lower in all variants of the experiment in comparison with the ‘Batavia F1’ hybrid. The concentration of nitrates in the heads of broccoli in all variants of the experiment did not exceed TLV (400 mg/kg wet weight). Conclusions. With an increase in the number of foliar treatments with “5 element” nanofertilizer, the yield increased and the quality of broccoli hybrids improved. It was revealed that the yield of the ‘Orantes F1’ hybrid in all variants of the experiment was higher in comparison with the ‘Batavia F1’ hybrid. When applying nanofertilizer “5 element” in three stages – foliar feeding in the phase of 4–6 leaves + beginning of head formation + 10–12 days after the beginning of head formation – we got the highest yield of broccoli in the hybrid ‘Orantes F1’ – 37.1 t/ha, an increase over the control variant (without fertilizers) was 6.6 t/ha, or 21.6%. The ‘Batavia F1’ hybrid had a yield of 33.5 t/ha, an increase over the control variant – 5.2 t/ha, or 18.4%.

Purpose of this study was to develop the main components of a model of an adaptive information system for predicting crop productivity. Methods. To conduct research on the establishment of the basic structural elements of an adaptive information model for predicting the productivity of basic crops used the method of constructing dynamic models. Results. A detailed analysis of conceptual approaches to the construction of mathematical agricultural models is carried out and the main advantages and disadvantages of modern analogues are established. It is determined that the adaptive information model is based solely on the needs of the plant and actually on the need to provide these needs with available resources in order to obtain consistently high yields with high quality indicators. The hardware and software complex must have a feedback relationship between its basic structural elements, because it significantly improves the accuracy of predicting plant productivity. Data based on the operation of certain mechanisms or indicators of weather conditions and their forecasts are used for decision making, however, if they are substantially changed, decisions about individual technology elements are reviewed. The software should be related to the economic part and should take into account market conditions and forecast data when making recommendations. In the case of low purchase prices for products, we recommend that certain agrotechnical operations (say vegetation feeding) be applied or not, in the case of significant change in growing conditions - when the application of these agro-measures will be ineffective due to the negative effects of drought, etc. Conclusions. Adaptive information system for forecasting productivity in the technological process of growing crops is formed on the basis of a model consisting of three modules of characteristics – the resultant and two components. At each subsequent stage of implementation of the model, the resulting feature becomes component, with the maximum contribution to the resulting feature of the next module.

Purpose. To determine the drought resistance of five millet varieties (ʻOmriyaneʼ, ʻKharkivske 57ʼ, ʻKonstantinovskeʼ, ʻIR 5ʼ, ʻSlobozhanskeʼ) using PEG 6000 as osmotic stress. Methods. To obtain the effect of drought, five concentrations of PEG 6000 solutions were used: 0.0% (control), 11.5%, 15.3%, 19.6%, 23.5% and 28.9%, which corresponds to 0.0, 115, 153, 196, 235 and 289 g of solute in 1000 ml of distilled water or 0.0, -1.9, - 3.1, - 4.8, - 6.6 and - 9.7 bar. Results. Osmotic stress strongly suppressed the germination of millet seeds at -3.1 bars (46.8%) and at -4.8 bars (28.66%) on the third day, but on the sixth day the number of germinated seeds increased to 92.8% and 84.0% respectively. The millet genotypes of differed significantly in the percentage of germination at various concentrations of the PEG 6000 osmotic solution. The minimum germination capacity was observed in variety Omriyane at -3.1, - 4.8, - 6.6 bars. ʻIR 5ʼ, ʻKonstantinovskeʼ and ʻKharkivske 57ʼ showed higher germination potential at the different concentrations of water stress. A decrease in root elongation in all genotypes compared to control was observed in -1.9 bars osmotic stress and then at -3.1 and -4.8 bars of osmotic stress the root length had the same value from 6.6 mm to 13.5 mm on the 3d day and from 25.3 mm to 34.7 mm on the 6th day. Variety ʻSlobozhanskeʼ showed higher mean root length at -3.1 and -4.8 bars of water stress induced by PEG on the 3d day (8,7 mm-12,5 mm) and on the 6th day (35.7 mm-32.3 mm). It is not observed shoot of millet at -9.7 bars on the 3d and on the 6th days. ʻKharkivske 57ʼ, ʻIR 5ʼ, ʻSlobozhanskeʼ showed higher individual shoot length of 23.1 mm, 25.5 mm, 25.6 mm, respectively at -4.8 bars of PEG 6000 on the 6th day. At -6.6 bars of osmotic stress ʻKonstantinоvskeʼ and ʻSlobozhanskeʼ had lowest root length/shoot length ratio 2.58 and 2.61, respectively. Variety ʻOmriyaneʼ (3.54) and ʻIR 5ʼ (3.31) had the maximum deviation from unity (3.54 and 3.31, respectively). Conclusions. Genotypes' ʻKonstantinоvskeʼ and ʻSlobozhanskeʼ, which showed a high level of drought resistance, were selected as a result of this study in breeding for drought resistance. Variety ʻIR 5ʼ, ʻKonstantinovskeʼ and ʻKharkivske 57ʼ were characterized highest seed germination percentage at the different water stress.

Purpose. To determine the effectiveness of using contrasting sowing dates after different predecessors to assess the genotypes of bread winter wheat in terms of yield and stability. Methods. Field, laboratory, mathematical statistics. Results. A different, but reliable level of influence on the yield of bread winter wheat genotypes of such factors as conditions of the year of cultivation (66.2%), predecessors (12.5%), sowing date (6.1%) and genotype (1.7% ) was revealed. Significant differences were noted in the response of the studied genotypes to the sowing date after different predecessors. Relatively less influence of the predecessors on the yield of the varieties ‘Estafeta Myronivska’ and ‘Vezha Myronivska’ was revealed, more – for the varieties ‘MIP Darunok’, ‘MIP Kniazhna’ and ‘MIP Vyshyvanka’. The sowing dates had less influence on the yield of the varieties ‘MIP Fortuna’, ‘MIP Vyshyvanka’ and ‘Trudivnytsia Myronivska’. A general tendency for decrease in the average annual yield was established in the experiment with a shift in the sowing dates from September 26 to October 16. However, for the number of genotypes after certain predecessors, the optimal sowing date was the 5th of October: after the predecessor, green-manure fallow – for varieties ‘Trudivnytsia myronivska’, ‘MIP Assol’ and ‘MIP Dniprianka’, after mustard – ‘Vezha Myronivska’, after sunflower – ‘MIP Fortuna’, after corn – ‘MIP Fortuna’ and ‘Podolianka’. In terms of sowing dates, the least variation in yield was found after the predecessors green manure, mustard and corn varieties ‘MIP Vyshyvanka’, ‘Balada Myronivska’, ‘MIP Kniazhna’, ‘Estafeta Myronivska’. Using the GGE biplot, it was found that close to the ‘ideal environment’ for the realization of the yield level of most genotypes was the second sowing date after greenmanure fallow predecessor. For different sowing dates and predecessors, on average for three years, the optimal combination of the level of yield and stability was noted for the varieties ‘Trudivnytsia Myronivska’, ‘MIP Vidznaka’, ‘MIP Assol’, ‘Estafeta Myronivska’, ‘MIP Valensiia’. Conclusions. Thus, the use of different so wing dates after various predecessors is an effective approach to organization of genotype-environmental tests. It makes it possible to identify the genotypes which are specifically adapted to certain conditions (predecessors and sowing dates) and genotypes with a relatively high level of stability when sowing after various predecessors and on different dates. This approach can be used both at the final stage of breeding to differentiate breeding lines for yield and stability, and in the development of basic elements of technology for growing newly created varieties.

Purpose. To study the protein content and other economically valuable traits in soybean varieties of various origin, to determine the stability and plasticity indicators of these traits, as well as to identify varieties that are promising for use in breeding programs. Methods. Field, laboratory, biochemical and statistical. Results. In total 22 soybean varieties of various origin in terms of yield, protein and oil content in seeds were investigated. High-yield and high-plasticity varieties are distinguished: ‘Muza’, ‘Mentor’, ‘Asuka’, ‘Valas’, ‘Kofu’, ‘Asuka’, ‘Cardif’, ‘Alligator’, ‘Vyshyvanka’, ‘Suziria’ and varieties of domestic breeding with stable yield ‘Siverka’, ‘Vilshanka’, ‘Ustia’, and also the ‘Lisbon’ variety. High protein content was noted in the variety ‘Opus’ – 45.0% in 2017. This variety on average for three years showed 43.63% of the protein in the seeds, and was second after the ‘Ustia’ variety (44.3%). The highest value of the regression coefficient b = 4.289 was observed in the ‘Lisbon’ varie­ty, which shows its high sensitivity to growing conditions with a fairly low average seed protein content of 38.60%, as well as the variety ‘Silesia’ b = 4.289 with an average protein value of 42,73%. Standard variety ‘Muza’ with a low protein content of 38.60% was quite stable in the expression of this characteristic – S2 = 0.222. A number of high-oil varieties were distinguished: ‘Valas’ – 22.77%, ‘Sigalia’ – 22.7%, ‘Alligator’, ‘Siverka’ – 22.53%, ‘Kofu’ – 22.13%, standard variety ‘Muza’ – 21.77%. Conclusions. In breeding programs aimed at increasing the protein content in seeds, the following varieties should be used: ‘Opus’ – as a carrier of the maximum value of the trait, as well as ‘Ustia’, ‘Asuka’, ‘Silesia’ and ‘Kasidi’ as combining high yield and high protein content. The weather conditions of the year in different ways influenced on the manifestation of the studied traits: in a favorable year for obtaining high yields, the protein content in the seeds decreased, the high protein content accumulated in a drier year, and the oil content in seeds changed insignificantly.

Purpose. Estimate phenological and morphological characteristics of Miscanthus giganteus J. M. Greef & Deuter ex Hodkinson & Renvoize, M. sacchariflorus (Maxim) Benth. and M. sinensis Anderss., obtained in vitro, and M. giganteus, propagated by rhizomimes (ex vitro) to attract them to the breeding process and create new forms of miscanthus for use in bioenergy. Methods. Seeds of M. sinensis, as well as M. sacchariflorus (2n), M. sacchariflorus (4n), introduced into culture and propagated in vitro according to commonly used methods (M. D. Melnychuk, A. Plazek et al.) were used in the studies. Phenological observations were carried out according to the methods of V. V. Zinchenko, M. V. Roik, D. B. Rakh­metov, and others. Statistical processing of the obtained data was carried out according to M. A. Shelamov and ot­hers. Results. M. sacchariflorus (2n) in the conditions of the Forest-Steppe of Ukraine does not enter into the flowering phase, whereas in M. sacchariflorus (4n) the flowering phase begins a month earlier than M. sinensis, which is an obstacle for transpollination of these species in the natural environment. M. giganteus, reproduced by rhizomes, in overwhelming majority of indicators (stem height and diameter, number of interstices and leaves, leaf area, length and width of cluster) dominate all species of mescanthus obtained in vitro. But the number of stems in the bush of M. sinensis is the highest (63 pcs.) and is almost 2–4 times higher than those of M. giganteus, obtained from risomes and in vitro. It has been revealed that the most promising forms for bioenergy use are M. sinensis, whose productivity is about 7 kg/m2 of green mass and M. giganteus, propagated by rhizomimes (ex vitro), where the mass of the aerial part is almost 9 kg/m2. But M. sacchariflorus (2n) and M. sacchariflorus (4n) should not be considered as promising species for use in bioenergy purposes, because their performance is very low compared to other species and is only 0.25 and 2.05 kg above ground mass from 1 m2. Conclusions. On the basis of the obtained data, the most promising forms of Miscanthus were established to attract them into the breeding process and to obtain new varieties with high biomass productivity for the needs of bioenergy.

Мета. Класифікація вихідного матеріалу кукурудзи за ступенем холодостійкості, ідентифікація самозапилених ліній кукурудзи в лабораторних і польових умовах за холодостійкістю та основними господарсько-цінними показниками та їхнє генотипування на основі SSR маркерів. Методи. Польові та лабораторні методи, молекулярно-генетичний аналіз. Результати. У результаті досліджень на основі cold test проведено ранжування самозапилених ліній кукурудзи за рівнем холодостійкості. Встановлено, що на результати ранжування не впливає тип зерна, оскільки до найбільш холодостійких належать лінії з різним типом зерна. Визначено, що польова схожість ліній кукурудзи варіювала залежно від строку сівби та становила 32,1–87,8% за першого (6–6,5 °С) строку сівби, 41,8–88,5% – за другого (8–8,5 °С) та 51,1–90,0% – за третього (10–10,5 °С). Встановлено, що самозапилені лінії: HLG 1203, HLG 1238, Co 255, UCH 37 та FV 243, Q170, AK 135, F2, L155 та P165 мають найкращу регенеративну здатність та найвищу схожість за холодного пророщування насіння та її збереження відносно контролю. За показниками урожайності самозапилених ліній визначено, що вони по різному реагують на строки сівби. Визначений генетичний поліморфізм холодостійких ліній за 5 SSR маркерами. Відповідно до отриманих результатів встановлено наявність від 3 до 7 алелів. Індекс поліморфності локусу (РІС) склав 0,56–0,86. За трьома маркерами – bnlg1129, bnlg1782 та phi064 у досліджуваних ліній було виявлено внутрішньолінійний поліморфізм. Результати досліджень дозволили визначити 4 кластери, які відобразили ступінь генетичної близькості за досліджуваними маркерами. Встановлено, що лінії Ak 135 та Ak 153, які увійшли в один кластер є найбільш спорідненими, а найбільш віддаленими – Со225 та Q 170. Отримані дані свідчать, що досліджувані лінії кукурудзи сформували кластери відповідно до їхнього походження і деякі – відповідно до їхньої холодостійкості. Висновки. За результатами досліджень виділено 7 самозапилених ліній кукурудзи (Co 255, HLG 1203, HLG 1238, Q 170, UCH 37, Ak 135, FV 243), які є цінним вихідним матеріалом у селекції на холодостійкість.

Purpose. To study the impact of clonal micropropagation and sanitation in vitro by viricide Ribavirin on ex vitro plant productivity, quantitative content and qualitative composition of peppermint essential oil components obtained from four breeding samples of peppermint plants (Mentha piperita L.) and the ‘Chornolysta’ variety. Methods. The study used methods of field agrotechnical one-factor experiment, essential oil distillation with water vapor according to the Ginzberg method, capillary gas chromatography and statistical analysis. Results. Due to the sanitation process in vitro, the yield of air-dried leaves of breeding samples increased by 2.9–7.1%, the ‘Chornolysta’ variety by 51.4% and rhizomes by 2.2–3.8% and 28.5% respectively, which amounted 0.35–2.74 t/ha. A significant increase of essential oil yield of breeding samples from 4.0 to 9.9 kg/ha was shown, and of the ‘Chornolysta’ variety – up to 28.6 kg/ha. After in vitro sanitation and clonal cropropagation of the breeding sample M 01-12, the content of essential oil was more than 4%. The following components of peppermint essential oil were identified: limonene, cineole, menton, mentofuran, isomenton, menthyl acetate, β-caryophyllene, isomenthol, menthol, pulegon, piperitone and carvone. A clear tendency to a decrease in the amount of menton and isomenthol with isomenton and menthol increase in plants, sanitated and propagated in vitro, was revealed. Conclusions. The use of tissue and organ culture methods and in vitro sanitation improves the qualitative composition of terpenoids by increasing the amount of menthol and menton reducing. The data obtained on the composition of terpenoids should be considered in peppermint selection as one of the integral criteria, which should be included in the list of economically valuable characteristics of peppermint plants, such as foliage, biomass of air-dried leaves, plant rhizomes and the amount of peppermint essential oil. Six indicators of the essential oil of the breeding sample M 01-02, namely citric acid, cineole, mentofuran, isomentone, pulegon, carvone, as well as the cineole / limonene ratio, meet the criteria of the European Pharmacopoeia, so it can be considered as promising for cultivation among the studied samples.

Цель. Установить наследование элементов продуктивнос­ти главного колоса гибридами первого поколения пшеницы мягкой озимой, полученных от скрещивания сортов, которые являются носителями пшенично-ржаных транслокаций (ПЖТ) 1ВL.1RS и 1AL.1RS. Методы. Фенологические, биомет­рические и статистические. Результаты. Отмечено дифференциацию элементов структуры урожая между гибридами F1. В 2016 г. по результатам анализа длины главного колоса гибридов F1 сверхдоминирование обнаружили у 26,7% из них, частично положительное доминирование – у 10,0%; по количеству зерен: сверхдоминирование – у 13,3%, частично положительное доминирование – у 10,0%; по массе зерен с главного колоса: сверхдоминирование – у 16,7%, частичное положительное доминирование – у 3,3%. В 2017 г. по длине главного колоса сверхдоминирование определено у 36,7% гибридов первого поколения, частичное положительное – у 10%; по количеству зерен: сверхдоминирование – у 46,7%, частичное положительное доминирование – у 6,7%; по массе зерен с главного колоса: сверхдоминирование – у 40,0%, частичное положительное доминирование – у 10%. Селекционно наиболее ценной по сочетанию длины и массы зерен с главного колоса является прямая комбинация скрещивания ‘Колумбія’ / ‘Експромт’ (1AL.1RS / 1AL.1RS), у которой обнаружен гетерозис в 2016 и 2017 гг.; по сочетанию количества и массы зерен с главного колоса – ‘Світанок Миронівський’ / ‘Легенда Миронівская’ (1BL.1RS / 1BL.1RS). Сочетание двух транслокаций в пшеничном генотипе может выступать как вспомогательный генетический фон, который повышает адаптивные свойства генотипа к стрессовым условиям окружающей среды и обеспечивает высокий и постоянный уровень зерновой продуктивности. Выводы. Выявлено разную степень наследования элементов зерновой продукции у гибридов пшеницы F1. Выделены гибридные комбинации F1, которые обеспечили сверхдоминирование и частичное положительное доминирование длины, количества и веса зерен главного колоса от скрещивания сортов-носителей ПЖТ. Селекционно наиболее ценными генотипами по сочетанию длины главного колоса и массы зерен с него является ‘Колумбія’ / ‘Експромт’ (1AL.1RS / 1AL.1RS), а количества и массы зерен с главного колоса – ‘Світанок Миронівський’ / ‘Легенда Миронівска’ (1BL.1RS / 1BL.1RS). | Мета. Установити успадкування елементів продуктивності головного колоса гібридами першого покоління пшениці м’якої озимої, отриманих від схрещування сортів, які є носіями пшенично-житніх транслокацій (ПЖТ) 1ВL/1RS і 1AL/1RS. Методи. Фенологічні, біометричні та статистичні. Результати. Відзначено диференціацію елементів структури врожаю між гібридами F1. У 2016 р. за результатами аналізу довжини головного колоса гібридів F1 наддомінування виявили у 26,7% із них, частково позитивне домінування – у 10,0%; за кількістю зерен: наддомінування – у 13,3%, частково позитивне домінування – у 10,0%; за масою зерен із головного колоса: наддомінування – у 16,7%, часткове позитивне домінування – у 3,3%. У 2017 р. за довжиною головного колоса наддомінування визначено в 36,7% гібридів першого покоління, часткове позитивне – у 10%; за кількістю зерен: наддомінування – у 46,7%, часткове позитивне домінування – у 6,7%; за масою зерен із головного колоса: наддомінування – у 40,0%, часткове позитивне домінування – у 10%. Селекційно найціннішою за поєднанням дов­жини головного колоса та маси зерен із нього є пряма комбінація схрещування ‘Колумбія’ / ‘Експромт’ (1AL.1RS / 1AL.1RS), у якої виявлено гетерозис у 2016 і 2017 рр.; за поєднанням кількості й маси зерен із головного колоса – ‘Світанок Миронівський’ / ‘Легенда Миронівська’ (1BL.1RS / 1BL.1RS). Поєднання двох транслокацій у пшеничному генотипі може виступати як допоміжний генетичний фон, який підвищує адаптивні властивості генотипу до стресових умов довкілля та забезпечує високий і сталий рівень зернової продуктивності. Висновки. Виявлено різний ступінь успадкування елементів зернової продукції в гібридів пшениці F1. Виділено гібридні комбінації F1, які забезпечили наддомінування та часткове позитивне домінування довжини, кількості та маси зерен головного колоса від схрещування сортів-носіїв ПЖТ. Селекційно найціннішими генотипами за поєднанням довжини головного колоса і маси зерен із нього є ‘Колумбія’ / ‘Експромт’ (1AL.1RS / 1AL.1RS), а кількості та маси зерен із головного колоса – ‘Світанок Миронівський’ / ‘Легенда Миронівська’ (1BL.1RS / 1BL.1RS). | Purpose. Investigate the inheritance of the elements of productivity of the main ear-head by hybrids of the first generation of soft winter wheat, obtained from crossing varieties that carry wheat-rye translocations (WRT) 1BL.1RS and 1AL.1RS. Methods. Phenological, biometric, and statistical. Results. The differentiation of the elements of the crop structure between F1 hybrids was revealed. In 2016, based on the results of the analysis of the main ear length of F1 hybrids overdominance was detected in 26.7% of them, partial positive dominance – in 10.0%; by the number of grains: overdominance – in 13.3%, partial positive dominance – in 10.0%; by weight of grains from the main ear: overdominance – 16.7%, partial positive dominance – 3.3%. In 2017, overdominance along the length of the main ear was determined in 36.7% of the first generation hybrids, partial positive dominance – in 10%; by the number of grains: overdominance – 46.7%, partial positive dominance – 6.7%; by weight of grains from the main ear: over-domination – 40.0%, partial positive dominance – 10%. In terms of breeding ‘Kolumbiia’ / ‘Ekspromt’ (1AL.1RS / 1AL.1RS) crossing was the most valuable by the combination of the length of the main ear and the grain weight of it, hete­rosis was observed in 2016 and 2017; ‘Svitanok Myronivskyi’ / ‘Lehenda Myronivska’ (1BL.1RS / 1BL.1RS) showed good results in combination of the number and weight of grains from the main ear. The combination of two translocations in the wheat genotype can act as an auxiliary genetic background that increases the adaptive properties of the genotype to stressful environmental conditions and provides a high and constant level of grain productivity. Conclusions. A different degree of inheritance of grain product elements in wheat hybrids F1 was revealed. Hybrid combinations F1, which provided overdominance and partial positive dominance of the length, number and weight of grains of the main ear from crossing carrier cultivars carring WRT were identified. In terms of breeding ‘Kolumbiia’ / ‘Ekspromt’ (1AL.1RS / 1AL.1RS) crossing was the most valuable by the combination of the main ear length and the weight of grains, ‘Svitanok Myronivskyi’ / ‘Lehenda Myronivska’ (1BL.1RS / 1BL.1RS) – in combination of the number and weight of grains from the main ear.