Under conditions of climate change, the assessment of the stability of genotypes is of particular importance. To conduct directed selection of genotypes with a narrow or broad reaction rate, it is necessary to assess their stability already in the early stages of breeding. The aim of the study was to study the stability of breeding significant traits of oat and barley samples in contrasting ecological and geographical conditions. 25 oat samples and 25 barley samples were studied over 3 years under contrasting conditions in St. Petersburg and the Tambov region. Varieties are characterized by average values of economically valuable traits and genotype regression coefficients on the influence of the bi environment according to Eberhart and Russell. The most sensitive to a change in the ecological and geographical situation were the durations of the germination-heading, germination-harvest periods and grain yield. These characters varied to a greater extent depending on the cultivation conditions than on the genotype. According to regression coefficients for environmental conditions, significant differences in genotypes were only in yield. Contrasting groups of varieties were distinguished by regression coefficients on environmental conditions, genotypes with high productivity. The durations of germination-heading, germination-harvest, the plant height reacted to the change in the environment the same in different varieties. The duration of the growing season was determined by the sum of effective temperatures above 15C. The reduction of the growing season in both crops was 3 days with an increase in the sum of effective temperatures above 15C by 100C.
This review surveys the current state of taxonomy, origin, and utilization prospects for naked barley. The cultivated barley Hordeum vulgare L. incorporates the covered and naked barley groups. Naked barleys are divided into six-row naked barley (convar. сoeleste (L.) A. Trof.) and two-row naked barley (convar. nudum (L.) A. Trof.). The groups include botanical varieties differing in the structural features of spikes, awns, floret and spikelet glumes, and the color of kernels. The centers of morphogenesis for naked barley are scrutinized employing archeological and paleoethnobotanical data, and the diversity of its forms. Hypotheses on the centers of its origin are discussed using DNA marker data. The main areas of its cultivation are shown, along with possible reasons for such a predominating or exclusive distribution of naked barley in highland areas. Inheritance of nakedness and mechanisms of its manifestation are considered in the context of new data in genetics. The biochemical composition of barley grain in protein, some essential and nonessential amino acids, β-glucans, vitamins, and antioxidants is described. Naked barley is shown to be a valuable source of unique combinations of soluble and insoluble dietary fibers and polysaccharides. The parameters limiting wider distribution of naked barley over the world are emphasized, and breeding efforts that could mitigate them are proposed. Pathogen-resistant naked barley accessions are identified to serve as promising sources for increasing grain yield and quality. Main stages and trends of naked barley breeding are considered and the importance of the VIR global germplasm collection as the richest repository of genetic material for the development of breeding is shown.
Background. Dark color of barley grain (Hordeum vulgare L.) can be caused by the synthesis and accumulation of two types of polyphenolic pigments – anthocyanins and melanins, which perform important functions in plant life, participating in the regulation of growth and development, and protecting plants from adverse environmental conditions. The aim of this study was to investigate the diversity of barley in the VIR collection in the context of grain color.Materials and methods. To analyze the pigment composition of the grain, 150 barley accessions with colored grains were selected from the VIR collection. Anthocyanins and melanins in grain husk were identified using qualitative reactions.Results and discussion. It was shown that in 60% of the accessions the dark color of their grain was induced by independent accumulation of melanin, while the accessions characterized by accumulation of only anthocyanins, and those with combined accumulation of anthocyanins and melanins, were 14.6% and 14%, respectively. For 11.3% of the accessions the presence of anthocyanins and melanins in grain husk was not found; their pigmentation could presumably be associated with an increased content of other polyphenolic pigments – proanthocyanidins. Accessions with melanin in grain predominated in all identified geographic groups, while other types of pigmentation were most evenly represented in the regions with the widest genetic diversity of barleys – Africa, East Asia, and the Middle East.Conclusion. Dark pigmentation of barley grain was shown to be mainly associated with the accumulation of melanin, and this type of pigmentation prevails in all geographical regions identified. The results obtained made it possible to describe the barley collection more fully and expand the possibilities of its utilization.
Plant breeding is an endless conveyor belt: cultivars developed earlier are included in hybridization plans and become the sources for new ones. The main tasks in barley improvement through breeding include raising the productivity of cultivars, improving their quality, and strengthening disease resistance. Correct selection, use, and studying of the source material – that is the key to successful breeding efforts. The first and most important step in constructing a cultivar is the process of hybridization. A valuable source of aid, and often the basis for newly developed cultivars, is the global collection of VIR, whose importance can hardly be overestimated. From 1936 to 2021, 27 barley cultivars were released: they are widely cultivated in Russia and Kazakhstan. Of these, 19 cultivars were obtained by pair hybridization; 4 cultivars by the complex stepwise hybridization technique; 4 cultivars through individual selection using the population approach. Despite the high importance of germplasm collection materials, 21 cultivars were produced by hybridization using a genotype selected at Omsk as one of the parental forms: in 16 cultivars, a local genotype was used as a maternal parent; in 12, as a paternal one; and in 8 cultivars, both parent forms were bred at Omsk Agricultural Scientific Center. Our retrospective analysis of a number of Omsk spring barley cultivars, on the one hand, confirms the earlier conclusions of Siberian scientists about a limited number of base crop cultivars, and on the other, attests to very rich pedigrees of spring barley cultivars in terms of the number of parent forms from the VIR global collection. Siberian barley ecotypes, characterized by increased adaptability to local harsh climate factors, should be further preserved in the national crop germplasm repository at VIR.
Background. A significant reduction in the yield of barley may be provoked by powdery mildew (causative agent: Blumeria graminis (DC.) Golovin ex Speer f. sp. hordei Marchal). A vast majority of cultivars approved for use in Russia are susceptible to the pathogen. Including genotypes protected by previously unused resistance genes into breeding practice is necessary to ensure the national food security. Barley landraces could become a fairly rich source of replenishment for the bank of effective pathogen resistance genes.Materials and methods. The study covered 950 barley accessions from the East Asian center of crop origin and domestication: 449 accessions from Japan, 313 from China, 173 from Mongolia, and 15 from Nepal. The experiments were carried out on young plants in a climatic chamber under artificial infection conditions. The northwestern (Pushkin, St. Petersburg) population of B. graminis served as an inoculum. Plant resistance was assessed using a scoring scale. The resistance of the selected forms was assessed twice.Results and conclusions. Significant variability of barley accessions from the countries of East Asia in their resistance to powdery mildew was observed. Symptoms of the disease were not found on plants of 16 studied forms. Weak or moderate development of the B. graminis mycelium was recorded for 21 accessions. Twenty-seven accessions were heterogeneous in the studied trait. Various levels of resistance were identified in 64 studied accessions (6.73%), among which 44 represented cultivars and breeding lines, and 20 were landraces. The percentage of accessions susceptible to the studied population of the pathogen was 93.27%.
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