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The purpose is to study the genetic and agrotechnological features of the formation of the sowing qualities of oat grain at various agricultural backgrounds in the forest-steppe of the Trans-Urals. Materials and methods. The research was carried out on an experimental field located in the forest-steppe zone of the Trans-Urals. The object of the study were three varieties of oats, which were sown on different agricultural grounds, ensuring the formation of yields from 3.0 to 6.0 t/ha of grain. The mass of 1000 grains, the proportion of fine grains, germination energy and laboratory germination were determined. Results. On the natural agricultural background, the Talisman and Otrada varieties form a yield of 1.41 and 1.85 t/ha with a fraction of fine grain (< 2.0 mm) up to 11 %. In the Foma variety on the natural agricultural background, this indicator was 7.5 %. The introduction of mineral fertilizers for the planned yield from 3.0 to 5.0 t/ha reduces the amount of fine grain only in the Talisman and Foma varieties. Grain with high sowing qualities is formed on a natural agricultural background and when fertilizers are applied to the planned yield of 3.0 t/ha. The grain obtained on such variants had 72–76 % germination energy and 91-93% laboratory germination. Grain obtained at a high and very high agricultural background had low sowing indicators: germination energy and laboratory germination reached minimum values: 57–59 and 61–63 %, respectively. It was found that the mass of 1000 grains depends on fertilizers by 23.4 % and 30.0 % on the weather conditions of the growing season. Varietal characteristics account for 9.6 %. Laboratory germination of the studied varieties by 86.8 % depends on the level of mineral nutrition. Scientific novelty. For the first time for the Northern Trans-Urals, an optimal level of agricultural background has been established, providing maximum yield of oat grain with high sowing qualities. Recommendations. In the forest-steppe zone of the Trans-Urals, the cultivation of oats for seed purposes is recommended in fields with an average or increased agricultural background, designed to obtain yields of 3.0 and 4.0 t/ha.

Purpose. To assess the drought resistance of modern varieties of oats at the initial stage of ontogenesis by laboratory method. Methods. The following varieties of oats have been studied: Foma, Otrada, Talisman, Marshal, Ekspress, Assol’, Tigrovy and Petrovich. Relative drought resistance was determined by simulating drought by increasing the osmotic pressure with different concentrations of sucrose: 1.4; 4.4; 7.4; 10.5 and 16.6 %. This corresponded to osmotic pressures of 3, 6, 9, 12, and 18 atm. Distilled water was used as a control. The response of varieties to drought was determined by seed germination and depression of growth processes. Results. It was found that the varieties Talisman and Petrovich are characterized by very low resistance to drought – at an osmotic pressure of 3 atm, their germination was 29 and 52%, respectively. With a further increase in pressure, only single germinations with a very high degree of depression (more than 80%) were noted. Oat variety Ekspress was characterized by maximum resistance to drought. Its seeds germinated when the osmotic pressure increased to 12 atm (sucrose concentration reached 10.5 %). To a small extent, the Foma variety was inferior to it, which germinated worse than Ekspress, but had an average degree of depression of growth processes at an osmotic pressure of 3 to 12 atm. The rest of the studied oat varieties were moderately drought-resistant both in terms of germination and depression. Scientific novelty. The conducted analysis of variance showed that the relative drought resistance by 72 % depends on the concentration of sucrose, which indicates the inefficiency of the assessment by one concentration. The share of influence of a variety on genetically determined drought resistance is 10.3 %. This confirms the hypothesis that drought resistance is determined not only by genetic inheritance. It is recommended to use varieties Foma and Ekspress as parental forms in breeding for drought resistance.

The purpose of this work is to study the nature of inheritance of avenin components and description of new blocks of components in oat varieties cultivated in the Tyumen region for further use in marker breeding. Methods. We analyzed the grains of F2 hybrids from crosses of oat varieties ♀Tyumenskiy golozernyy × ♂Megion, ♀Tyumenskiy golozernyy × ♂Otrada, ♀Otrada × ♂Tyumenskiy golozernyy, ♀Megion × ♂Otrada. Native electrophoresis was performed in 13.2 % PAGE for 4.0–4.5 h at a constant voltage of 500 V. Results. In the course of research, it was found that the analyzed components of avenin make up blocks. The frequency distribution of phenotypic classes for each locus in each of the studied hybrid combinations corresponds to the assumption that each of the blocks is inherited as a single codominant mendelian unit. The synthesis of blocks of avenin components is controlled by three independent avenin-coding loci. Analysis of the inheritance of individual components of avenin in F2 hybrids made it possible to describe three new blocks of components, the synthesis of which is controlled by the Avn A locus – A9, A10, and A11; one block controlled by the Avn B locus – B7 and one block controlled by the Avn C locus – C8. On the basis of the results obtained, complete protein formulas were drawn up for the studied varieties of sowing oats: Tyumenskiy golozernyy – Avn 2.7.3; Megion – Avn 2 + 9.7.5; Otrada – Avn 10 + 11.4.8. It was found that the use of a spectrum of only one type as a standard is insufficient and leads to errors in the identification of component blocks. For more accurate identification, several varieties should be used simultaneously to obtain a complex spectrum-standard that combines several blocks of components for each locus. Scientific novelty. Described 5 new blocks of avenin components. These blocks can be used to assess the intrapopulation genetic diversity of oat varieties, as well as to search for adaptively significant and economically valuable traits linked to them.

The purpose is to study the varietal characteristics of the photosynthetic efficiency of oats when applying fertilizers in Western Siberia. Methods. The research was carried out on an experimental field located in the northern forest-steppe of the Trans-Urals. Photosynthetic potential and net productivity of photosynthesis were determined by the Nichiporovich’s method. Results. The nature of the formation of the assimilation surface and the accumulation of biomass of oat varieties Otrada, Talisman and Foma at different levels of mineral nutrition was studied. The photosynthetic potential and the net productivity of photosynthesis are calculated. The share of the influence of weather conditions, agrophone and variety on the studied indicators is determined. The Foma variety was characterized by maximum leafiness, compared to the Talisman and Otrada. On a natural agrophone, its assimilation surface in the sweeping phase reached 36.0 ± 5.5 thousand m2, at Otrada and Talisman – 28.1 and 24.0 thousand m2 per 1 ha of sowing. A very strong variability of the leaf surface area in Otrada was revealed (Cv = 24 %). The use of mineral fertilizers enhances the development of the leaf apparatus by 44–50 % and causes competition between oat plants. A close positive correlation was revealed between the leaf area in the sweeping phase and yield (r = 0.72). The area of the assimilation surface of oats is affected by: weather conditions – 37 %; nutrition level – 30 % and variety – 25 %. It was found that the Otrada and Foma varieties have the same accumulation dynamics and form the maximum photosynthetic biomass by the sweeping phase. The nature of biomass accumulation depends on weather conditions by 39 %; on mineral fertilizers by 29 % and on the genotype of the variety by 17 %. The productivity of the studied varieties is formed by increasing the assimilation surface, rather than increasing the efficiency of photosynthesis. Scientific novelty. For the first time, the photosynthetic potential was determined and the efficiency of the net photosynthesis productivity of oat varieties of the Tyumen selection was revealed. The share of the influence of various factors in the formation of the oat crop in the conditions of the Northern Trans-Urals has been established.