Gene Pool Of Population Research Articles

The dusty smut of barley in the Omsk region and sources of resistance to it

Most barley varieties grown in the Omsk region on an area of more than 300 thousand hectares are affected by dusty smut. The purpose of our study is to analyze the gene pool of the pathogen population and identify the sources of resistance to it. In the field, on an artificial infectious background of the plant immunity laboratory in 2019-2023, in the first decade of July, during flowering, test varieties with identified resistance genes were infected: Run 1, Run 3, Run 6, Run 7, Run 8, Run 12 and Run 14, varieties of local selection Gift of Siberia (susceptibility indicator) and Omsk 99 (stability indicator), samples of the world collection of barley VIR and hybrid material of Omsk ancestor teliospores of the local population of the Dusty smut Ustilago tritici. hordei (Jens.) Kell. et. Sw. (Оld name Ustilago nuda (Jens.) Kell. et Swing). Infected seeds were sown and the lesion of the samples for the next year was taken into account according to the VIR method and the adapted SIMMIT method. The results of the study of the dusty smut population showed that varieties with the Run 3, Run 6 and Run 8 genes and sample L-6823 (Run 12) showed high resistance to the pathogen. The Trebi (Run 1) and Anoidium (Run 7) samples showed a variation from practical resistance to weak susceptibility (damage from 2.5 to 19.1%), and the Korol sample (Run 14) – from weak to strong susceptibility. The assessment of the stability of the varieties included in the GR of the Russian Federation and the hybrid material of the laboratory for the breeding of grain crops showed that most forms are affected from a weak to medium degree. The Omsk 102 variety, included in the GR of the Russian Federation since 2023, has confirmed its resistance to dusty smut. In the hybrid material, samples with practical stability and mild damage were isolated – Nutans 4945 and Nutans 4926. Among the collection material, resistant numbers were identified: Suzdalets (k-30314), Zadel, Vityaz (RF), Himalayen (k-15549), Galt (k-19910), Bonanza (k-21661) all from Canada, etc. The listed samples are recommended as sources of stability for inclusion in the breeding process when creating resistant varieties for cultivation in the Omsk region.

Human migration from the Levant and Arabia into Yemen since Last Glacial Maximum

While a broad consensus about the first successful migration modern humans out of Africa seems established, the peopling of Arabia remains somewhat enigmatic. Identifying the ancestral populations that contributed to the gene pool of the current populations inhabiting Arabia and the impact of their contributions remains a challenging task. We investigate the genetic makeup of the current Yemeni population using 46 whole genomes and 169 genotype arrays derived from Yemeni individuals from all geographic regions across Yemen and 351 genotype arrays derived from neighboring populations providing regional context. Principal Component Analysis shows stratification between Yemen districts but also with respect to nearby populations: Yemeni, other Arabian and Bedouin samples form a continuum towards the populations of the Levant, whereas East Africa and India appear strongly differentiated. This finding is further supported by higher Principal Components, admixture and haplogroup analyses, and F-statistics. Moreover, two-reference linkage disequilibrium decay estimates are most significant for Yemeni admixture from an ancient northern influx (up to 5220BP from Palestine) and East Africa (750BP). We show that the initial gene flow into the Yemeni populations of today came from the rest of Arabia and the Levant, and a less substantial and more recent genetic impact into coastal Yemen from East Africa, particularly.

The influence of post-glacial migration and hybridization on the gene pool of marginal Quercus pubescens populations in Central Europe.

In Central Europe, the drought-tolerant downy oak (Quercus pubescens) is at the northern edge of its natural distribution range, often growing in small and spatially isolated populations. Here, we elucidate how the population genetic structure of Central European Q. pubescens was shaped by geographic barriers, genetic drift and introgression with the closely related sessile oak (Q. petraea). 27 Q. pubescens populations from the northern margin of Q. pubescens' natural distribution range were sampled. Based on 16 nuclear microsatellite markers (nSSRs), Bayesian clustering and distance-based analyses were performed to determine the intraspecific genetic structure and to identify genetic barriers. To identify drivers of introgression with Q. petraea, generalised linear models were applied to link levels of introgression with environmental conditions. To track post-glacial migration routes, the spatial distribution of haplotypes based on 8 chloroplast microsatellite markers (cpSSRs) was investigated. Based on nSSRs, the study populations of Q. pubescens were divided into a western and an eastern genetic cluster. Within these clusters, more pronounced genetic substructure was observed in the west, probably due to a rugged topography and limited gene flow. Introgression from Q. petraea was more prevalent at wetter and north-exposed sites and in the west. The identified cpSSR haplotypes followed known migration pathways. Our results suggest two late-glacial refugia in or near the southwestern Alps and the southeastern Alps as potential sources for post-glacial migration. Although some genetic exchange is evident in Northern Italy, south of the Alps, the two clusters remain distinct at a large scale. Landscape features and introgression with Q. petraea shaped the genetic substructure at a smaller scale. Our study provides a comprehensive overview of the genetic structure of Q. pubescens in Central Europe, relevant for conservation.

Генетический ландшафт севера Европы от Скандинавии до Волго-Окского междуречья во второй половине I – начале II тыс. н.э.: археогенетические исследования последних лет

The articles gives an analytical review of the research findings dedicated to the genetic history of the North and North-East Europe in the last quarter of the 1st – early 2nd millennium AD. By the era of vikings population of Scandinavia could be genetically divided into three local subclusters, such as a)Danish-like, b)Swedish-like and c)Norwegian-like. This clusters partially match the modern boundaries of these countries. During the viking era the gene pools of the local populations started to merge. The most rapid spreading was found in the Danish-like component. Migration processes influenced people in the coastal and main territories. During the viking era West Scandinavia was exposed to migrants from the British Islands. Sweden and Gotland were exposed to the eastern population of Ruthenia and East Baltic region. Danemark and South Sweden were found with individuals of South European origins. During the viking era Scandinavian people were actively moving outside the region. Norwegian immigrants moved to Ireland, the Isle of Man and settled across Iceland and Greenland. Danish immigrants mostly explored Britain. Swedish immigrants spread across the Baltic coast in Estonia and Poland and internal Eastern European plains crossed by river routes. DNA data obtained in Ladoga and Gnezdovo highlight significance of both local and alien Scandinavian population. The Volga-Oka interfluve population in the first half of the 1st millennium AD was genetically close to the west Finno-Ugric people and revealed a lot of the West Siberia component in its gene pool. The early Medieval Russian colonization led to a different genetic group in this area. It was related to the contemporary Belarusians, Ukrainians and Ryazan Russians. In 900s–1200s Slavic ancestors co-existed with Finno-Ugric people in the Volga-Oka interfluve. Unlike the Old Ladoga and Gnezdovo Scandinavian genetics was not found here. The West Ingria lacks genome-wide data. Y-chromosome researches suggest that the early Medieval Russians appeared here as late as in 1000s–1100s. By the late 1200s they had mixed with the local Finnish population. Novgorod sopkas and Pskov long kurgans cultures have not yet had ancient DNA data obtained. Such data could have thrown light on the history of Slavic migrations across the North-West Ruthenia. The viking era migrations finished and led to the migrants’ genes being absorbed by locals from the internal Scandinavia. In the same way, outside Scandinavia Scandinavians’ genes were absorbed. In 1200s Slavic colonists’ ancestors absorbed ancestors of the local Finno-Ugric populations in the Volga-Oka interfluve. These mixed gene pools resulted in the contemporary Russians from this region being far from Belarusians and Ukrainians. The Finno-Ugric enclaves lasted in the West Ingria.

The structure of the gene pool of the southern tribal groups of tuvans

Introduction. The Y-gene pool of the southern Tuvan tribal groups – Soyan and Choodu – was first studied and their comparative analysis with representatives of Kyrgys (south-east of Tuva) and Oorzhak (west of Tuva) tribal groups was carried out. Purpose of the study: to determine the genetic status of the Soyan and Choodu tribal groups within the genetic landscape of the population of Southern Siberia. Materials and methods. The sample (total N=150) included samples from representatives of Oorzhak (N=42), Soyan (N=29), Kyrgys (N=46) and Choodu (N=33) tribal groups. The genotyping panel included 60 SNP-markers of Y-chromosome, characteristic of the populations of Northern Eurasia. Results. In the gene pools of studied tribal groups, 27 branches of 7 large haplogroups (C2, J2, N1, O, R1a, R1b) of Y-chromosome were identified. The main part of Choodu, Oorzhak, Soyan gene pools is represented by “North Eurasian” haplogroups (N1, Q) and Kyrgys gene pool is dominated by “East Eurasian” haplogroups C2 and O. The “West-Eurasian” haplogroups, mainly represented by subhaplogroup R1a1a-Z93, account for less than a quarter of the gene pool of all four studied groups, without revealing a clear geographical trend. In the genetic space of the population of Southern Siberia the Soyan, Choodu and Kyrgys, together with other of Tuvan tribal groups, formed the Tuvan-Tofalar claster. Tuvan-Tofalar, Altai and Khakass clusters indicate three sources of gene pool of the indigenous population of Southern Siberia. Maps of genetic distances showed greater similarity of the Soyan and Choodu with the rest of Tuvan tribal groups than with other populations of Southern Siberia. But the map of genetic distances from Kyrgyz reveals a different pattern: areal of genetically similar populations is more extensive, covering southern and southeastern Tuva, Mongolia and western Buryatia. Conclusion. The prevalence of “North-Eurasian” haplogroups in the gene pools of the studied Tuvan tribal groups and data of historians, ethnographers, linguists and geneticists suggest that their gene pool was formed at the Samoyed-Ket layer (VI-III centuries BC), and the accumulation of Central Asian component in the gene pool of Kyrgys occurred at a later stage of Kyrgys gene pool formation, presumably from the XII-XVIII centuries. Analysis of the gene pool of Tuvans through their tribal groups structure makes a significant contribution to the reconstruction of the ethnogenesis of Tuvan tribal groups, along with the data of anthropologists, historians, ethnographers and linguists.

Analysis of the genetic structure of populations of the terrestrial mollusk <i>Caucasotachea vindobonensis</i> (Helicidae) in conditions at the eastern border of the range using microsatellite markers

BACKGROUND: Assessing the genetic structure of populations of rare and vulnerable species provides useful information for developing conservation strategies. AIM: The aim of the study was to study the genetic structure of Caucasotachea vindobonensis populations in the south of the Central Russian Upland using SSR markers. MATERIALS AND METHODS: Genetic structure of the populations was studied using eight microsatellite markers, first identified by the authors for the species under study. Fragment analysis of PCR products was carried out on an automatic capillary DNA sequencer Nanophore 05 (Russia). A total of 498 individuals from 24 populations were studied. RESULTS: A total of 59 alleles were isolated in the eight studied SSR loci, of which 21 (36%) turned out to be private. At the same time, private alleles were found in eleven studied populations, which is 46% of their total number. According to the data obtained, the effective number of alleles (Ae) averaged 1.6 ± 0.06, the Shannon index (I) was 0.45 ± 0.03, and the level of expected heterozygosity (He) was 0.27 ± 0.021. A high level of spatial subdivision of population gene pools was noted (Fst = 0.47 ± 0.08) with a fairly low level of gene flow (Nm = 1.15 ± 0.91). PCA analysis showed that the populations of the central and eastern parts of the south of the Central Russian Upland form a closely related group, different from other populations of the region. Calculation of the effective abundance using the LD method showed that Ne varies in different groups of snails from 0.6 to infinity. CONCLUSIONS: Populations of C. vindobonensis in the south of the Central Russian Upland live in conditions of significant isolation, as evidenced by the high degree of differentiation of the studied groups. The analysis of principal components based on genetic distances according to Nei and Wright’s F-statistics indicate a pronounced division of populations in the study area into two clusters, which is probably associated with the historical features of landscape formation. Calculation of effective numbers indicates the high viability of the majority of the studied populations. At the same time, some groups of snails are clearly in a depressed state, which is reflected in low levels of genetic diversity and their effective size.

GENETIC DETERMINANTS OF CARBOHYDRATE METABOLISM: INTRA- AND INTERETHNIC VARIABILITY OF THE LACTASE LCT, TREHALASE TREH AND SUCRASE-ISOMALTASE SI GENES IN THE EVENKI AND OTHER INDIGENOUS PEOPLES OF SIBERIA

Introduction. The authors consider the features of genetic determinants of disaccharide assimilation as the corollary of adaptation to the environment. The aim of the study was to assess the polymorphism of the genes that determine activity of disaccharidase enzymes lactase (LCT, rs4988235), trehalase (TREH, rs2276064) and sucrase-isomaltase (SI, rs781470490) in different territorial groups of Evenks. Materials and methods. Biomaterial samples from 1365 unrelated individuals representing 15 ethno-territorial population groups in European Russia, Siberia, and the Far East of the Russian Federation were genotyped. "Focus" groups include "Western" (N=65), "Transbaikal" (N=50), and "Okhotsk" (N=81) Evenks (Krasnoyarsk Krai, Northern Transbaikalia, Okhotsk-Aldan region). The other study groups allow us to assess the specificity of the distribution of genetic determinants of disaccharide assimilation in populations that differ from racial, ecological, and subsistence perspectives. Results. The Evenki territory subgroups do not differ from each other in terms of allele frequencies and genotype distribution of LCT (p>0.2) and TREH (p>0.8) and are similar to Yakuts, Buryats, Mongols, and populations of the Far East and Chukotka. The SI delAG deletion was not found in the Western Evenki subgroup. Discussion. A question of similarity between taiga hunters Evenks to cattle breeders Buryats, Mongols, and Yakuts in terms of C*LCT frequencies requires further elaboration. Possible explanations may include a weakening of selection for the T*LCT allele due to the shift in traditional diet toward replacement of fresh milk with fermented dairy products, high activity of specific intestinal microflora, or the existence of other lactase synthesis genetic determinants, besides LCT*C/T-13910. The evolutionary origins of the clinal variation in the TREH gene allele frequencies, which appears to be associated with the expression of the Mongoloid ancestral component in the gene pool of populations in Northern Eurasia, remain unclear. It seems appropriate to conduct genetic screening in the indigenous populations of the Russian Far East in order to assess the prevalence of SI delAG deletion as an inducer of the sucrase-isomaltase deficiency.

OPTIMIZATION OF THE MODE OF DEPOSITION OF ASEPTIC CULTURES IN VITRO OF A RARE AND ENDEMIC SPECIES ALLIUM IVASCZENKOAE

Optimization of the method of medium-term storage of the rare and endangered plant species Allium ivasczenkoae under in vitro conditions using modern approaches of biotechnology is an urgent task. Aseptic microplants Allium ivasczenkoae were used as starting material. The cultivation of microplants was carried out on nutrient media supplemented in various combinations with an increased concentration of sucrose, mannitol, chlorocholine chloride, ABA and BAP at various temperature and light conditions of deposition. The survival dynamics of A. ivasczenkoae varied depending on cultivation regimes. After 9 months of deposition, the survival of test-tube plants in mode 1 (control) was 20%, mode 2 - 60-80%, mode 3 - 30-50%. Under experimental conditions, the best results were obtained by depositing aseptic cultures for 9 months at a low positive temperature and low light intensity (mode 2) on nutrient media with the addition of CCC 120 mg/l and a sucrose concentration of 60 g/l and (B-1) and MS medium containing 0.5 mg/l BAP and 3 g/l mannitol (MSВМ). This mode of deposition made it possible to lengthen the period between transplants, as well as to maintain the viability of A. ivasczenkoae microplants from 60 to 80%. The data obtained make it possible to optimize the mode of medium-term storage of Allium ivasczenkoae under in vitro conditions for the mass production of rare species of bulbous plants in order to restore, reproduce and preserve the number of valuable gene pool and natural populations, create gene banks in vitro, reintroduce and green building.

Elucidating population structure and genetic diversity of intercross sheep through pedigree analysis

The aim of this study was to assess the population structure and genetic diversity along with determining the accuracy of ongoing selection program in a closed flock of Intercross sheep through pedigree analysis. The pedigree records of 2245 animals maintained at CSWRI-NTRS, Garsa, Kullu during the period from 2012 to 2023 were utilized to calculate the genealogical information, genetic conservation index and other parameters based on gene origin probabilities. Lambs born during 2020 and 2023 were considered as reference population. ENDOG version 4.8 software package was used for pedigree analysis. Analysis revealed that the mean generation interval for the reference population was 3.20 years with a longer interval in dam-offspring pathways relative to sire-offspring pathways. Average inbreeding coefficients for whole and reference population were 0.21 and 0.49 % and corresponding average relatedness was 1.24 and 1.72 %, respectively. The average maximum, equivalent and completed generations were 2.50, 1.96 and 1.63 with 0.12 %, 0.17 % and 0.20 % increase in inbreeding coefficient, respectively. This resultant effective population size estimated using individual increase in inbreeding was 156.52. Effective numbers of founders (fe) and ancestors (fa) was 68 and 61, respectively for reference population with a ratio of 1.11, indicating occurrence of minor effects of bottleneck in the flock. The genetic contribution of most influent ancestors contributing 50 % of the gene pool was only 23. The estimated founder genome (fg) and non-founder genome (fng) were 35.87 and 75.91, respectively in the present population. The estimate for fg/fa ratio was 0.59 which explained that 59 % of the original genetic diversity is exit in the reference population. Genetic conservation index (GCI) ranged from 1 % to 20.28 % with a mean value of 4.91 %. Overall, males recorded a slightly higher GCI than females, i.e., 5.23 vs 4.65 %, respectively. The results revealed that, the population has augmented genetic diversity and low level of inbreeding. Small fraction of genetic diversity was vanished due to unequal contribution of founders and minor bottleneck effects occurred due to disproportionate contribution of breeding animals to gene pool of population. Use of a sufficient number of breeding rams and optimum contribution selection (OCS) is recommended to maintain the genetic diversity as well as enhancing production potential in this population.

Individual from the kurgan burial of the XII century in the Middle Oka — experience of complex archaeological and genetic research

For the first time, this paper presents a complex study of the burial of the ancient Russian woman from the classic “Vyatich” mound from the Kremenyie burial site (Moscow region). The mounds and synchronized ground cremation burials are combined at this unique 12th-century burial site. The aim of this research is to examine the historical details of the person from the mound using conventional archaeological, anthropological, and archae-oparasitology methodologies along with modern paleogenetics methods. The burial site is characterized by a general “archaic” rite, manifested in the late preservation of the cremation rite along with the burial. According to anthropological data, an elderly woman, over forty, was buried there. She was identified as a member of the local population by radiogenic strontium isotope (87Sr/86Sr) study. Rich grave content and the fact that the body was buried in the middle of the mound indicate the woman's high social standing in the community. According to ar-chaeoparasitological data, the eating habits of the woman appear to be characterized by the consumption of un-cooked or insufficiently thermally prepared freshwater fish. The complete mtDNA sequence reconstruction indi-cates that it belongs to haplogroup V1a1, one of the Western Eurasian haplogroup V branches. To date, this represents the first case of the V1a1 mitogroup being found in the Russian Plain during ancient times. A repre-sentative of the Danish Viking clan from the Oxford burial site of the XI century was the closest of the ancient samples to the mtDNA of the studied woman, which indicates a genetic relationship on the maternal lineage with the medieval Northwestern European population. Single nucleotide substitution A7299G in the mitogenome of the woman clusters her with present-day Russians from the Belgorod and Pskov regions and shows the continuity of the modern Russian population with the Ancient Russians. Thus, the results of our study demonstrate the private details of the individual as common historical features, which include the ceremonial side of burial and belonging to the maternal genetic lineage preserved in the modern gene pool of the Russian population.

Measuring the Efficiency of Purging by non-random Mating in Human Populations.

Human populations harbor a high concentration of deleterious genetic variants. Here, we tested the hypothesis that non-random mating practices affect the distribution of these variants, through exposure in the homozygous state, leading to their purging from the population gene pool. To do so, we produced whole-genome sequencing data for two pairs of Asian populations exhibiting different alliance rules and rates of inbreeding, but with similar effective population sizes. The results show that populations with higher rates of inbred matings do not purge deleterious variants more efficiently. Purging therefore has a low efficiency in human populations, and different mating practices lead to a similar mutational load.

Consanguinity, complex diseases and congenital disabilities in the Souss population (Southern Morocco): a cross-sectional survey

BackgroundSeveral studies showed that the perpetuation of consanguinity increases homozygosity and homogenizes the population's gene pool. This allows the expression of recessive deleterious mutations and increases the prevalence of genetic disorders and birth defects. Despite the reported negative health effects, consanguinity is still practiced in Morocco. This study aimed to evaluate the prevalence and socio-demographic determinants of consanguinity in the Souss region and to assess the association of this type of union with congenital disabilities and complex diseases. To meet this aim, a survey based on a cross-sectional approach was conducted between January 2019 and January 2020 among 520 randomly selected participants in the Souss region.ResultsThe findings revealed a high prevalence of consanguinity of 28.46%, with first-cousin unions accounting for 16.15% of all marriages. According to multivariate logistic regression analysis, early age at first marriage, men’s occupation, endogamy, and parental consanguinity were predictive factors for consanguineous unions in the study population. Moreover, the results revealed a significant association between consanguinity and the incidence of physical disabilities (OR = 3.753; [95% CI 1.398–10.074]), mental retardation (OR = 5.219; [95% CI 1.545–17.631]), deafness-mutism (OR = 4.262; [95% CI 1.004–18.089]) and cardiovascular diseases (OR = 2.167; [95% CI 1.036–4.530]). However, no significant association was found between consanguinity and diabetes, cancer, asthma, epilepsy, and psychiatric disorders.ConclusionOverall, our results suggest a high practice of consanguinity in the Souss population, associated with social, economic, and cultural factors. Consanguineous unions were associated with a high incidence of mental retardation, physical disabilities, deafness-mutism, and cardiovascular diseases. In this population, where marriage between relatives is highly preferred, awareness programs are not sufficient, and genetic studies on consanguinity-related diseases are necessary to provide specific premarital screening and thus increase the efficiency of genetic counseling.

Еволюційні зміни сірої української породи

The article presents the macro- and micro-evolutionary changes of the Gray Ukrainian breed over the past 100 years, which can be used in breeding and selection to preserve the existing gene pool population and in its further use, and can be useful in the breeding process not only in Ukraine, but also in other countries. At the same time, animals and even families that were weak, sickly and did not meet the requirements of the program of its development and preservation were ranked off and not used in breeding. Compared to similar animals that left the herd, it was possible to improve some external indicators in the historical aspect: body length, hips width, and chest girth, which influenced the cattle live weight. The important fact is that it is characterized by high reproductive properties (yield of calves is 97–98 per 100 cows, which is not found in any specialized meat breed in the world) and excellent maternal qualities. At the same time, a strong constitution, resistance to diseases, small fetus size and good adaptation to a dry hot climate, pasture-free maintenance and ecological fodder and technological conditions of the steppe zone of Ukraine were preserved. During the extended period of raising animals, the gray Ukrainian breed is not inferior to the classic meat breeds of the world in terms of fattening quality (30-month-old bulls on fattening more than 1000 g/day) and slaughter performance — the slaughter yield has increased to 60%. Beef is rated at 4.5 points on a 5-point scale in terms of culinary and taste qualities, it has the meat marbling which attracts the processor company and the consumer. The skin of animals is highly valued: already at the age of one year, the skin of bulls is marked as heavy (over 25 kg), which allows to use it for the high-quality products manufacture. Due to the set of economically useful characteristics, gray Ukrainian cattle are classified as meat and contribute to the establishment of state meat cattle breeding.

Natural selection and genetic diversity maintenance in a parasitic wasp during continuous biological control application

Aphidius gifuensis is a parasitoid wasp and primary endoparasitoid enemy of the peach potato aphid, Myzus persicae. Artificially reared, captive wasps of this species have been extensively and effectively used to control populations of aphids and limit crop loss. However, the consequences of large-scale releasing of captive A. gifuensis, such as genetic erosion and reduced fitness in wild populations of this species, remains unclear. Here, we sequence the genomes of 542 A. gifuensis individuals collected across China, including 265 wild and 277 human-intervened samples. Population genetic analyses on wild individuals recovered Yunnan populations as the ancestral group with the most complex genetic structure. We also find genetic signature of environmental adaptation during the dispersal of wild populations from Yunnan to other regions. While comparative genomic analyses of captive wasps revealed a decrease in genetic diversity during long-term rearing, population genomic analyses revealed signatures of natural selection by several biotic (host plants) or abiotic (climate) factors, which support maintenance of the gene pool of wild populations in spite of the introduction of captive wasps. Therefore, the impact of large-scale release is reduced. Our study suggests that A. gifuensis is a good system for exploring the genetic and evolutionary effects of mass rearing and release on species commonly used as biocontrol agents.

The role of introgressive hybridization in shaping the geographically isolated gene pools of wax palm populations (genus Ceroxylon)

The speciation continuum is the process by which genetic groups diverge until they reach reproductive isolation. It has become common in the literature to show that this process is gradual and flickering, with possibly many instances of secondary contact and introgression after divergence has started. The level of divergence might vary among genomic regions due to, among others, the different forces and roles of selection played by the shared regions. Through hybrid capture, we sequenced ca. 4,000 nuclear regions in populations of six species of wax palms, five of which form a monophyletic group (genus Ceroxylon, Arecaceae: Ceroxyloideae). We show that in this group, the different populations show varying degrees of introgressive hybridization, and two of them are backcrosses of the other three ‘pure’ species. This is particularly interesting because these three species are dioecious, have a shared main pollinator, and have slightly overlapping reproductive seasons but highly divergent morphologies. Our work supports shows wax palms diverge under positive and background selection in allopatry, and hybridize due to secondary contact and inefficient reproductive barriers, which sustain genetic diversity. Introgressed regions are generally not under positive selection. Peripheral populations are backcrosses of other species; thus, introgressive hybridization is likely modulated by demographic effects rather than selective pressures. In general, these species might function as an ‘evolutionary syngameon’ where expanding, peripheral, small, and isolated populations maintain diversity by crossing with available individuals of other wax palms. In the Andean context, species can benefit from gained variation from a second taxon or the enhancement of population sizes by recreating a common genetic pool.

Генетическое разнообразие сохраненной и предковой популяций чистопородного холмогорского скота Республики Коми

The genealogical information and genetic markers of different types were used to evaluate the genetic diversity of the endangered Kholmogory cattle breed in the Komi Republic. The main genealogical and gene pool of the ancestral population is available in the gene pool farms and the bank of cryopreserved semen of bulls. The effective number of the today’s population is sufficient to prevent the inbreeding from increasing above the acceptable limits for a short time. However, to maintain the genetic diversity for a long time, we need to attain at least a two-fold increase in the effective population number, primarily by increasing the number of seed donors. The use of different types of markers allows to obtain the exhaustive and objective information about the dynamics of the gene pool of the endangered breed.

Study and conservation of biodiversity of honey bees in Russia

Middle Russian, Bashkir, Carpathian, Gray Mountain Caucasian and Far Eastern bees are bred in Russia. As a result of selection based on selected material, the following breed types were reared: “Priokskiy”, “Orlovskiy”, “Tatarskiy” and “Burzyanskaya Bortevaya” of Middle Russian; “Maykopskiy” and “Moskovskiy” of Сarpathian; and “Krasnopolyanskiy” of Gray Mountain Caucasian breeds. Work was carried out at farms-originators of breed types “Priokskiy” on the apiaries of Federal beekeeping research centre, “Tatarskiy” – selective centre “Tatarskiy”, “Burzyanskaya Bortevaya” – State nature reserve “Shulgan-Tash”, “Krasnopolyanskiy” – Krasnopolyanskya Experimental station of Beekeeping. The materials of approbation of breeding achievements of the Bashkir and Far Eastern breeds and breed types “Orlovskiy”, “Maikopskiy” and “Moskovskiy” were analyzed. The research was guided by the “Method of conducting tests for distinctness, uniformity and stability”. Honey bee (Apis mellifera L.)” and “Methods of research work in beekeeping”. The characteristics of the morphometric features of bees, queens and drones, as well as the ethological features of bee colonies of reared breeds and breed types are presented. Reserves, sanctuaries and breeding farms are indicated that are engaged in the conservation, selection improvement and reproduction of selected queen bees and families of a certain origin, as well as their sale in breeding zones for further reproduction. To conduct breeding work in beekeeping, a number of documents have been prepared: Regulations on the state nature reserve for the conservation of the gene pool of the native breed (population) of the honey bee, the Rules for classifying farms engaged in breeding bees as breeding farms, the National standard for the queen bee, the Interstate standard for the bee colony. The study of the gene pool of breeds, types and populations of bees, the control of their purity are the main conditions for its conservation and rational use.

Incidence and evolutionary relevance of autotriploid cytotypes in a relict member of the genus Daphne (Thymelaeaceae).

Odd ploidy-level cytotypes in sexually reproducing species are considered a dead end due to absent or reduced fertility. If sterility is only partial, however, their contribution to the population gene pool can be augmented by longevity and clonal growth. To test this, we investigated the cytotype origin and spatial pattern, and pollen viability in three relict shrub species of the genus Daphne (Thymelaeaceae Juss.) in central Europe. Daphne cneorum subsp. cneorum is a widespread European species that has a broad ecological amplitude, whereas D. cneorum subsp. arbusculoides and D. arbuscula are narrow endemics of the western Pannonian Plain and the Western Carpathians, respectively. Our study confirmed that all three taxa are diploid. However, of more than a thousand analysed individuals of D. cneorum subsp. cneorum, five in four different populations were triploid. Our data indicate that these triploids most likely originate from recurrent autopolyploidization events caused by the fusion of reduced and unreduced gametes. High pollen viability was observed in all three taxa and in both diploid and triploid cytotypes, ranging from 65 to 100 %. Our study highlights the significant role of odd ploidy-level cytotypes in interploidy gene flow, calling for more research into their reproduction, genetic variability, and overall fitness. Interestingly, while the endemic D. arbuscula differs from D. cneorum based on genetic and genome size data, D. cneorum subsp. arbusculoides was indistinguishable from D. cneorum subsp. cneorum. However, our study reveals that the subspecies differ in the number of flowers per inflorescence. This is the first comprehensive cytogeographic study of this intriguing genus at a regional scale, and in spite of its karyological stability, it contributes to our understanding of genomic evolution in plant species with a wide ecological amplitude.

Traces of Human-Mediated Selection in the Gene Pool of Red Deer Populations.

In this study, we analysed the effect of human-mediated selection on the gene pool of wild and farmed red deer populations based on genotyping-by-sequencing data. The farmed red deer sample covered populations spread across seven countries and two continents (France, Germany, Hungary, Latvia, New Zealand, Poland, and Slovakia). The Slovak and Spain wild red deer populations (the latter one in a large game estate) were used as control outgroups. The gene flow intensity, relationship and admixture among populations were tested by the Bayesian approach and discriminant analysis of principal components (DAPC). The highest gene diversity (He = 0.19) and the lowest genomic inbreeding (FHOM = 0.04) found in Slovak wild population confirmed our hypothesis that artificial selection accompanied by bottlenecks has led to the increase in overall genomic homozygosity. The Bayesian approach and DAPC consistently identified three separate genetic groups. As expected, the farmed populations were clustered together, while the Slovak and Spanish populations formed two separate clusters. Identified traces of genetic admixture in the gene pool of farmed populations reflected a strong contemporary migration rate between them. This study suggests that even if the history of deer farming has been shorter than traditional livestock species, it may leave significant traces in the genome structure.

The formation of proto-austronesians: insights from a revised phylogeography of the paternal founder lineage.

Previous studies suggested that the Y-chromosome haplogroups O2-N6-B451-AM01756 and O1a-M119 are two founder lineages of proto-Austronesians at about five thousand years ago. The objective of this study was to investigate the formation of proto-Austronesians from the perspective of the paternal gene pool. In this study, we developed a highly evised phylogenetic tree with age estimates for haplogroup O2-N6 and early branches of O1a-M119 (M110, F1036, and F819). In addition, we also explored the geographical distribution of eight sub-branches of O2-N6 and O1a-M119, and spatial autocorrelation analysis was conducted for each sub-branch. The paternal lineage combination of proto-Austronesians is a small subset of a diverse gene pool of populations from the mainland of East Asia. The distribution map and results of the spatial autocorrelation analysis suggested that the eastern coastal region of northern China is likely the source of lineage O2-N6 while the coastal region of southeastern China is likely the diffusion center of early branches of O1a-M119. We developed an evolutionary diagram for Austronesians and their ancestors in the past 18,000years. We proposed that the millet farming community in North China is the common ancestor group of the Austronesians and the Han people, while the diverse ancient people in the southeast coastal areas of East Asia form the common ancestor group of the Austronesians and the East Asian mainland population. The demographic history of multiple ancestral groups of the most recent common ancestor group itself in the more ancient period is helpful to understand the deep roots of the genetic components and cultural traditions of Austronesians.