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Articles by Jelena Tsombalova
Total Records ( 2 ) for Jelena Tsombalova
  Hilma Peusha , Tamara Enno , Irena Jakobson , Jelena Tsombalova , Anne Ingver and Kadri Jarve
  A group of spring wheat cultivars originating from Sweden, Finland, Norway, Germany, and the Netherlands was analysed for powdery mildew resistance. Using functional molecular markers, two alleles of the major resistance gene Pm3 were detected among the cultivars under the study. One of the alleles, Pm3d, was detected in the resistant cultivars ‘Vinjett’, ‘SW Estrad’, and ‘Zebra’, and in ‘Tjalve’, a cultivar of earlier release susceptible to the local population of powdery mildew. The second allele of Pm3 detected in the analysed group of cultivars was the allele Pm3f, rarely used in Europe. It was identified in the resistant cultivars ’Satu’, ’Helle’, and in the moderatively resistant cultivar ‘Mahti’. Pm3f was found to be effective against the local population of powdery mildew in Estonia, while Pm3d provided no protective effect. Besides the Pm3d allele on chromosome 1A, monosomic analysis of the cultivar ‘Vinjett’,which is almost immune to powdery mildew, identified two additional loci on chromosomes 5D and 7D, respectively, presumably responsible for the high resistance in this cultivar. In contrast to the earlier cultivars, six recently released cultivars (‘Vinjett’, ‘SW Estrad’, ‘Zebra’, ‘Satu’, ‘Helle’, ‘Meri’) demonstrated a high resistance to the powdery mildew fungus Blumeria graminis DC. f. sp. tritici both in the field and seedling tests, showing that the genetic basis of powdery mildew resistance in Nordic spring wheat has been improved noticeably in the last ten years.
  Jelena Tsombalova , Merlin Haljak , Anne Ingver and Kadri Jarve
  In order to select molecular markers suitable for the seed control practice, 12 regionally cultivated spring wheat varieties were analysed by 41 microsatellite markers (SSRs). The analysed group included a pair (‘Satu’-‘Helle’) and a triplet (‘Tjalve’-‘Vinjett’-‘SWEstrad’) of varieties derived from each other. A dendrogram resulting from analysis of the matrix of dissimilarities discriminated all varieties, and in full agreement with the pedigree data, the varieties were divided into three groups consisting of Nordic, German and Dutch varieties, respectively. In the genetically close Nordic subgroup, Swedish varieties ‘Vinjett’ and ‘SWEstrad’ could be distinguished only by three of the analysed 41 SSR markers. An attempt was made to analyse genetic diversity in the group on the basis of morphological characteristics evaluated according to the UPOV guidelines. The clustering of morphological data resulted in a dendrogram which agreed neither with the known pedigree data nor with the conducted SSR analysis. Multilocus SSR analysis revealed heterogeneity in the analysed plant material. In order to monitor inheritance of the detected heterogeneous or null-alleles, six breeding lines derived from the studied varieties were analysed. In two of the breeding lines, non-parental SSR alleles were detected. Outcrossing is suggested as a possible source of the inconsistent alleles. A minimal set of molecular markers needed to identify/verify a variety in a group can be composed of markers amplifying fragments unique in the group length. In this study, identifying markers were found for seven varieties of the group; the remaining five varieties could be identified in the group by combinations of two or three microsatellite markers.
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