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Search Results: 1 - 10 of 19127 matches for " Jelena Bo?kovi? "
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Durable resistance to Puccinia triticina by accumulation of resistance genes
BokoviJelena,Bokovi? Mom?ilo
Genetika , 2009, DOI: 10.2298/gensr0903355b
Abstract: The individual use of single race-specific resistance genes with major phenotypic effects has rarely provided lasting resistance. However, breeding and combining or pyramiding of resistance genes into individual cultivars has had considerable success, particularly in situations in which the pathogen does not reproduce sexually, as in the case of wheat leaf rust pathogen. In European-Mediterranean region perfomed international investigations of wheat leaf rust proved that breeding of new lines of wheat resistant to Puccinia triticina Eriks. for differentiation of pathogen population, as well as for sources of durable resistance is necessary. Breeding of such resistant lines has proved necessary due to the unsatisfatory survey results of these regions on standard isogenic Lr lines. It has become clear that these regions needed new, more efficient differential resistance genes, as well as sources of resistance. In the beginning, after extensive screening tests of several International Rust Nurseries, 18 donors of resistance had been selected as crosses with recurrent parents' varieties Princ and Starke. These hybrid lines had been comparatively tested with twenty six Lr single gene lines using twenty especially virulent cultures of P. triticina in order to check the presence of these known Lr genes in our hybrid lines. Considerable influence of recurrent parent to the number of resistant genes in used donors was demonstrated. On the other hand, considerable influence of the pathogen culture was established to the number of resistance genes in used donors. In order to enhance resistance and pyramiding genes in these hybrids, the most interesting selected eight lines have been crossed with only effective isogenic ones, containing the strong genes Lr9, Lr19 and Lr24. On the basis of different segregation rations of all crossing combinations it was proved that no one of resistant donors contained the applied strong resistant genes. It means that our hybrid lines contained resistant genes from the donors, as well as three strong resistant genes Lr9, Lr19 and Lr24.
Testing of wheat to durable resistance and survey approach for Puccinia recondita tritici
BokoviJelena,Bokovi? Mom?ilo,Priji? ?eljana
Genetika , 2008, DOI: 10.2298/gensr0802095b
Abstract: The main objective within new approach in international pathogenicity surveys of Puccinia recondita tritici was to provide genetically diverse sources of resistance (wheat lines with pyramiding resistant genes) to be used in a survey of wheat leaf rust pathogen in European-Mediterranean regions and to search for and document pathogenicity of P. recondita tritici cultures useful in differentiating sources of resistance. Emphasis is placed on sources of resistance and their usefulness rather than on description of fungus populations. In this international survey new methods have been applied containing Central Field Nursery, Central Seedling Tests, Cooperative Seedling Tests and Regional Field Nurseries (ELRWN-European Leaf Rust of Wheat Nursery). The results have been reported from one year of investigations. ELRWN contained 20 winter wheat hybrid lines with pyramiding resistant genes including strong ones Lr9, Lr19 and Lr24. In addition, 16 spring wheat lines were included, as control lines were Lr9, Lr18, Lr19, Lr24 and Lr14. In that year ELRWN have been realized in 13 countries and cooperative seedling test in 8 countries using 22 pathotypes of P. recondita tritici. The best results obtained by the winter wheat lines NS-66/5'Lr24, NS-77/2'Lr19, NS- 37/2'Lr19 and spring wheat lines 647-CMA-14793 and 26TH-ESWYT-10. The results have shown loosing almost complete resistance of Lr9 and Lr24, but much less Lr19.
Accumulations of genes for durable resistance to wheat leaf rust pathogen
BokoviJelena,Bokovi? M.,Priji? ?eljana
Journal of Agricultural Sciences , 2008, DOI: 10.2298/jas0803163b
Abstract: The individual use of single race-specific resistance genes with major phenotypic effects has rarely provided lasting resistance. However, breeding and combining or pyramiding of resistance genes into individual cultivars has had considerable success, particularly in situation where the pathogen does not reproduce sexually, as in the case of wheat leaf rust pathogen. Within international leaf rust of wheat investigations it was necessary, to create by breeding new resistant wheat lines to Puccinia recondita tritici for differentiation of pathogen population, as well as for sources of resistance in European-Mediterranean regions. In the beginning 18 donors of resistance had been selected after an extensive screening test of several International Rust Nurseries, to be crosses with recur- rent parents varieties Princ and Starke. These tests proved that in those lines were present new resistant genes. Eighth genetically different hybrids of the first back-cross had been selected and tested in the seedling stage with three international pathogen cultures (YU-13-19-1; H-13-9-1 and C2-13-Ar-3). Considerable influence of recurrent parent to the number of resistant genes in donors used was demonstrated. On the other side, it was established considerable influence of the pathogen culture to the number of resistant genes in donors used. The same crossing combinations tested with one pathogen culture results in presence of two resistance genes, but with another culture three or one resistant gene. In order to enhancement resistance and pyramiding genes in these hybrids, eight selected the most interesting lines have been crossed with only effective isogenic containing the strong genes Lr9, Lr19 and Lr24.The genetic analysis of twenty two crossing combinations have been realized by testing with three pathotypes of Puccinia recondita tritici ( Bg.s. 12/89; Is.w 8/89 and Chl.w. 14/89). On the base of different segregation ratios of all crossing combinations it was proved that no one of the resistant donors contained the strong resistant genes used. It means that our hybrid lines contained resistant genes from the donors and in addition three strong resistant genes Lr9, Lr19 and Lr24.
Taxonomic Diversity of Fungi Associated with Some PCN Populations from Serbia
Violeta Oro,Jelena Bokovi,Slobodan Milenkovi?,Solveig Tosi
Pesticidi i Fitomedicina , 2012,
Abstract: Increased content of pesticides in food chain resulted in using microorganisms asagents of biological control. The potato cyst nematodes (PCN) - Globodera pallida and G.rostochiensis belong to the group of the most important parasites - the quarantine organisms.The external and internal area of a cyst harbor numerous fungal and bacterial species.The aim of this study was to identify antagonistic fungi associated with some PCN populationsfrom Serbia. Fungal antagonists of potato cyst nematodes have not been previouslyinvestigated in our country. The diversity of PCN fungal antagonists is not reflected only atthe species level but also at the level of higher taxonomic categories.
Mucinous cystadenofiobroma of the ovary
Bokovi? Tamara,?olai Matilda,Ili? Jelena,?ivojinov Mirjana
Medicinski Pregled , 2012, DOI: 10.2298/mpns1212527b
Abstract: Introduction. Cystadenofibromas are tumors of the ovary which originate from the surface coelomic epithelium. Benign mucinous cystadenofibroma is a very rare form of these tumors, which consists of dominant stromal component of the connective tissue and one or more cysts. Case report. The case of a 62-year-old female with tumor of right ovary is reported in this paper. Histologically, tumor of the ovary had multilocular cystic formation, lined by a single-layer of mucoproductive cylindrical epithelium - endocervical type. In one area of tumor, the stromal component was abundant and made from partially hyalinised dense connective tissue. Mucinous cystadenofibroma was diagnosed on the basis of histological examination. Since the mucinous type of cystadenofibroma or adenofibroma is rare, this case has been chosen to be presented. Conclusion. Mucinous cystadenofibromas are differentially- diagnostically very similar to different malignant tumors and it is extremely important to make correct diagnosis of these neoplasms.
The use of cardboard factory sludge in the remediation of zinc contaminated sediment
Prica Miljana,Dalmacija Milena,Dalmacija Bo?o,Tri?koviJelena
Journal of the Serbian Chemical Society , 2012, DOI: 10.2298/jsc111111022p
Abstract: Paper and cardboard factory sludges are generated by various processes during pulp, cardboard and paper production, and the increasing quantities produced make the disposal of this sludge a problem. This study investigates the use of cardboard factory sludge as a stabilizing agent in the solidification/stabilization (S/S) treatment of zinc polluted sediment. Semidynamic and toxicity leaching tests were conducted to assess the effectiveness of the solidification/stabilization treatment and long-term zinc leaching behaviour. A diffusion-based model was used to elucidate the controlling leaching mechanisms. The applied S/S treatment was effective in immobilizing zinc, and the controlling leaching mechanism appeared to be diffusion, which indicates that a slow leaching of zinc could be expected when cardboard mill sludge is applied as a S/S agent.
Effect of genotype and pre-sowing fertilization on yield of garden pea
Dozet Gordana,BokoviJelena,Galonja-Coghill Tamara,Ze?evi? Veselinka
Genetika , 2011, DOI: 10.2298/gensr1102229d
Abstract: During the two-year study on the influence of presowing fertilization on growth and development of garden pea (Pisum sativum L.) in three different experimental setups, five genotypes of peas were used, two of Dutch origin and three that were created at the Institute of Field and Vegetable Crops. The aim of the study was to determine the extent to which different genotypes and complex NPK fertilizer influence the yield per plant. The average yield per plant for both years was 16.86 g. The influence of genotype on grain yield per plant was statistically significant (p<0.01). Tamish cultivar showed significantly lower yields during both study years, in comparison with other genotypes tested, except when compared with the Danube cultivar in year 2007. There was no regularity in the influence of pre-sowing fertilization on grain yield per plant. Regression analysis of the pea genotypes, revealed a slight reduction in yield per plant as a function of increased use of complex fertilizer. Grain yield per plant was in high positive correlation (p<0.01) with yield components, and with the length of the stem. The number of pods was in strong correlation with grain numbers and weight of pods. Number of grains and the absolute weight were in highly statistically significant correlation with the mass of pods.
Effect of nitrogen and ecological factors on quality of winter triticale cultivars
Ze?evi? Veselinka,Kne?evi? Desimir,BokoviJelena,Milenkovi? Slobodan
Genetika , 2010, DOI: 10.2298/gensr1003465z
Abstract: Field experiments were conducted during three growing seasons of (2004/05, 2005/06 and 2006/07) to investigate the effect of various nitrogen doses on quality components of two winter triticale cultivars (Favorit and Trijumf). Nitrogen fertilizers are applied in four doses: N1= 60 kg N ha-1, N2= 90 kg N ha-1 and N3= 120 kg N ha-1. Analysis of sedimentation, gluten content, and rheological flour and dough properties were done. The results showed that N fertilization significantly increased investigated quality traits in both cultivars. The highest sedimentation value and gluten content established with application of 120 kg N ha-1. Triticale cultivars reacted positively to nitrogen increasing, and its rheological flour and dough properties increased with N increasing. Nevertheless, quality of investigated cultivars belonged to C2 quality group. By the analysis of variance established high significant differences in mean values of sedimentation, wet gluten content and water absorption among the cultivars (A), years (B) and supplied nitrogen doses (C). All interactions (AB, AC, BC and ABC) were significant for wet gluten content, but for sedimentation only interaction, while of water absorption was only significant interaction BC.
Effect of genotype and environment on wheat quality
Ze?evi? Veselinka,Kne?evi? Desimir,BokoviJelena,Madi? Milomirka
Genetika , 2009, DOI: 10.2298/gensr0903247z
Abstract: Five winter wheat cultivars created in Small Grains Research Centre of Kragujevac (Ana Morava, Toplica, Vizija, Takov anka and Lazarica) were grown at the macro field trial in three locations (Kragujevac, Sombor and Ba ka Topola) during three years (2004-2006). Influence of genetic and agro-ecological conditions of locations on wheat quality components (sedimentation value and wet gluten content) was investigated. The analysis of variance suggested there were highly significant differences among genotypes (G), investigated years (Y) and locations (L) for sedimentation value and wet gluten content. Apart from individual influence of the factors, their interactions (G x Y, G x L, Y x L, G x Y x L) were also high significant for both investigated traits. In average the highest sedimentation value (40.6 ml) and wet gluten content (31.85 %) established at Backa Topola locality. The highest value of all investigated cultivars and localities established at cultivar Vizija (45.3 ml) in Ba ka Topola, while the lowest at Lazarica (31.7 ml) in Sombor. The highest wet gluten content was measured at Ba ka Topola locality by cultivar Toplica (38.53 %). In this investigation Ba ka Topola locality was favourable for both investigated quality traits.
Synthesis of biomorphaus SiC-ceramics
Egelja Adela D.,Gulicovski Jelena J.,Deve?erski Aleksandar B.,Bokovi? Sne?ana B.
Hemijska Industrija , 2007, DOI: 10.2298/hemind0702075e
Abstract: The carbothermal reduction processing of partially mineralized fir (Abies alba) samples was used to obtain highly-porous SiC ceramics with cellular structure. The infiltration of TEOS (tetraetilortosilikat, Si(OC2H5)4) as a silica source, was conducted in order to carry out the mineralization process. Synthesis of the SiC was achieved with a C/SiO2 replica annealing at 1723 K in Ar atmosphere. The obtained samples were characterized using X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM) and energy dispersive spectrometry (EDS). The experimental results revealed that the hierarchical bimorphous wood structure was preserved even after high-temperature treatment. Microstructural characterization of the ceramics revealed the presence of the P-SiC phase and traces of the a-SiC phase.
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