RESUMO
The allelic diversity at four gliadin-coding loci was examined in modern cultivars of the spring and winter durum wheat Triticum durum Desf. Comparative analysis of the allelic diversity showed that the gene pools of these two types of durum wheat, having different life styles, were considerably different. For the modern spring durum wheat cultivars, a certain reduction of the genetic diversity was observed compared to the cultivars bred in the 20th century.
Assuntos
Variação Genética , Gliadina/genética , Filogenia , Triticum/genética , Alelos , Cruzamento , Federação RussaRESUMO
DNA samples obtained from the populations of the Red Data Book species Bellevalia sarmatica (Georgi) Worovow from Volgograd oblast were examined using RAPD and AFLP analyses. DNA marking revealed considerable differences in the levels of interpopulation and intraspecific polymorphism of the Bellevalia. Furthermore, RAPD analysis, despite of lower levels of interpopulation polymorphism identified, made it possible to obtain clearer data on population subdivision upon statistical treatment of the results. The results of this study can be used in developing conservation strategies for maintenance of the species abundance and genetic diversity, as well as in elaborating the criteria for construction genetic collections.
Assuntos
Liliaceae/genética , Filogeografia , Folhas de Planta/genética , Polimorfismo Genético , Análise do Polimorfismo de Comprimento de Fragmentos Amplificados/métodos , Genoma de Planta , Técnica de Amplificação ao Acaso de DNA Polimórfico/métodos , Federação RussaRESUMO
The possibility of using RAPD and AFLP methods for genetic monitoring of populations of Matthiola fragrans (Bunge), a species included in the Red Book of the USSR, was shown for the first time. An analysis of inter- and intrapopulation and interspecies genome polymorphism was performed. Differences in the genetic structure of Matthiola populations from various geographical collection points were revealed. A simple method of performing RAPD analysis and the great number of unique markers found in each population compared with the AFLP analysis, as well as the good division of populations under statistical treatment, allow us to draw the conclusion that using the RAPD method in genetic monitoring of rare and insufficiently studied species is well founded.
Assuntos
Análise do Polimorfismo de Comprimento de Fragmentos Amplificados , Brassicaceae/genética , Monitoramento Ambiental/métodos , Técnica de Amplificação ao Acaso de DNA Polimórfico , Extinção Biológica , Variação Genética , Polimorfismo Genético , Federação RussaRESUMO
Genetic diversity for the alleles of gliadin-coding loci was studied with 465 durum wheat cultivars from 42 countries. A total of 108 alleles were identified for four loci; 60 alleles were described for the first time. Broad diversity of rare gliadin-coding alleles was observed. The highest genetic diversity was characteristic of durum wheat cultivars from the Middle East, Trans-Caucasia, the Pyrenean Peninsula, and the Balkans. Two genetically isolated ancient branches were isolated. A southern branch included mostly cultivars from the Mediterranean region, the Middle East, and Trans-Caucasia. A northern branch included Russian and Ukrainian durum wheat cultivars and varieties obtained on their basis. An additional group included durum wheat cultivars that had been obtained in several past decades on the basis of the material of international breeding centers (CIMMYT and ICARDA) and had low genetic diversity.
Assuntos
Gliadina/genética , Triticum/genética , Alelos , Biodiversidade , Loci Gênicos , Seleção Genética , Triticum/classificaçãoRESUMO
Allelic diversity at five gliadin-coding gene loci has been studied in the most important spring durum wheat cultivars released in Russia and former Soviet republics in the 20th century (66 cultivars). Seven, 5, 8, 13, and 2 allelic variants of blocks of gliadin components controlled by the loci Gli-A1d, Gli-B1d, Gli-A2d, Gli-B2d, and Gli-B5d, respectively, have been identified. The allelic diversity did not exhibit a consistent trend during the period studied. Nei's diversity index (H) was 0.68 in the period from 1929 to 1950, increased to 0.70 in 1951-1980, and decreased to 0.58 after the year 1981. It has been found that the most frequent alleles in this collection are relatively rare in other regions of the world, which suggests unique ways of the formation of the diversity of durum wheat cultivars in the former Soviet Union. The efficiency of electrophoresis of storage proteins as a method for identification of durum wheat cultivars by the gliadin electrophoretic pattern has been estimated.
Assuntos
Alelos , Variação Genética , Gliadina/genética , Locos de Características Quantitativas/genética , Triticum/genética , História do Século XX , Federação Russa , Triticum/históriaRESUMO
RAPD analysis was used to verify the varieties in an in vitro germplasm collection of lilac Syringa vulgaris L. RAPD patterns were obtained with 16 decanucleotide primers for 46 accessions (microclones and corresponding reference varieties). The RAPD patterns of a microclone and the corresponding reference variety often differed in composition; consequently, it was infeasible to verify the accessions by direct comparison of the RAPD patterns. Hence, evaluation of the relative genetic distances between accessions (microclones) and known varieties was proposed as a method to verify lilac in vitro germplasm collections.
Assuntos
DNA de Plantas/genética , Variação Genética , Syringa/genética , Marcadores Genéticos , Filogenia , Técnica de Amplificação ao Acaso de DNA Polimórfico , Syringa/classificaçãoRESUMO
Sixty-four durum wheat varieties of the domestic breeding (USSR and Russia) were studied for heterogeneity using various genetic markers: storage proteins (gliadins), RAPD, and microsatellite (SSR) markers. About a third of the studied varieties (24) were shown to be heterogeneous at the protein markers. These varieties contained from two to six biotypes. Using the molecular markers, the biotypes were found to differ not only in the gliadin-coding genes as determined with the protein markers, but also in other chromosome regions. Moreover, using SSR markers, some additional subbiotypes were detected within the biotypes defined with the gliadin markers. Thus, the intravarietal durum wheat heterogeneity is an important component of general species biodiversity.
Assuntos
Biodiversidade , Cromossomos de Plantas/genética , Genes de Plantas/genética , Gliadina/genética , Repetições de Microssatélites/genética , Triticum/genética , Cruzamento/métodos , Marcadores Genéticos , Técnica de Amplificação ao Acaso de DNA Polimórfico/métodosRESUMO
Polymorphism at 28 SSR loci was analyzed and described in 45 cultivars of spring durum wheat created in the former USSR and Russia during the last 80 years. Each cultivar was shown to have a unique allele combination. This allows SSR markers to be used to identify durum wheat varieties. Meanwhile, these markers can hardly be used to detect phylogenetic relationships among varieties and to specify their pedigrees, because genetic distances calculated on the basis of these markers do not correlate with the distance calculated by coefficient of parentage.
Assuntos
DNA de Plantas/genética , Repetições de Microssatélites/genética , Filogenia , Polimorfismo Genético/genética , Locos de Características Quantitativas/genética , Triticum/genética , Especificidade da EspécieRESUMO
RAPD analysis was carried out with 22 accessions of the genus Syringa, including six species, one interspecific hybrid, and 15 cultivars. In total, 500 polymorphic fragments were detected; species-specific and cultivar-specific markers were identified. For the first time, genetic polymorphism and genome similarity coefficients were estimated and phylogenetic relationships were established for the genus Syringa.
Assuntos
Marcadores Genéticos , Syringa/genética , DNA de Plantas/genética , Genoma de Planta , Filogenia , Técnica de Amplificação ao Acaso de DNA Polimórfico , Especificidade da Espécie , Syringa/classificaçãoRESUMO
A comparison of similarity indices between 64 durum wheat cultivars calculated using pedigree analysis and RAPD method showed a correspondence between these two approaches to estimation of genetic diversity. The associations between the results of RAPD clustering and coefficients of parentage (chi 2 test) and the coefficient of correlation between similarity matrices were statistically significant. However, the correlation was rather weak while pedigree analysis and RAPD method did not yield completely identical estimates of genetic diversity in the set of cultivars studied.
Assuntos
Filogenia , Técnica de Amplificação ao Acaso de DNA Polimórfico , Triticum/genética , Especificidade da Espécie , Triticum/classificaçãoRESUMO
Each wheat cultivar has a characteristic spectrum of gliadins. This makes it possible to use blocks of the components of reserve proteins as genetic markers when estimating seed quality. However, identification of the blocks that constitute the electrophoretic spectrum is a complicated task. For this purpose artificial neural network (ANN) technology is proposed. Based on experimental data, a teaching database and testing databases have been created. ANN was shown to be highly efficient (efficiency up to 100%) expert system for deciphering the electrophoretic spectra of gliadins of durum wheat cultivars.
Assuntos
Gliadina/genética , Redes Neurais de Computação , Triticum/genética , Automação , EletroforeseRESUMO
Computer-based genetical register "GENREG" allows to carry out a prophylactic medical examination for families with children, having hereditary diseases, multifactorial pathology and congenital developmental defects of various nature, and also epidemiological examination. Automated consultative system for pre-laboratory diagnosis of genetically determined diseases after the phenotypical manifestations "DIAGEN" allows to identify up to 1200 nosologic units; diagnostic value (or weight) of the signs according to physician's evaluation is taken into consideration. The system sorts out a narrow differential-and-diagnostic row and information about specific laboratory and functional changes for every selected diagnosis. Efficiency of the system is over 94% (after the next laboratory findings). The results of computer diagnosis and final physician's diagnosis, and also questionnaire of a child are stored in archives (files) of the "DIAGEN" system. Both of the systems are realized on PC/AT IBM-compatible computer.