Search

Aim. Acceleration of the sunflower lines homozygosity for isolation of the fertility restorer resistant to tribenuron methyl herbicide using in vitro culture of sunflower immature embryos. Methods. Methods of immature sunflower embryos cultivation in in vitro culture; methods of classical crossing. Results. As a result, homozygous genotype was created and isolated from three combinations (BH0118xSURES-2, BH0218xSURES-2 and BH0318xSURES-2) for 10 parent sunflower lines. Conclusions. The use of the technology of sunflower immature embryos cultivation in in vitro culture effectively accelerates the sunflower lines homozygosity for the fertility restorer isolation resistant to tribenuron methyl herbicide. The involvement of immature sunflower embryos cultivation in in vitro culture methods can reduce time for creation of initial parental sunflower lines twice. Keywords: sunflower, immature embryos, in vitro culture, herbicide resistance, tribenuron methyl.

Aim. To create a genetic construct carrying the bacterial protein Cas9 gene, the reporter β-glucuronidase gus gene, as well as the marker phosphinotricin-N-acetyltransferase bar gene for plant genome editing. Methods. Molecular-biological, biotechnological, microbiological and bioinformatic methods were used in the study; Golden Gate molecular cloning method was used to create genetic constructs. Results. The genetic construct pSPE2053 which carries the Cas9 endonuclease gene, the gus and bar genes was created; the assembly correctness of all vector elements was confirmed by polymerase chain reaction; the construct was transferred to Escherichia coli and Agrobacterium tumefaciens cells; β-glucuronidase gene expression was verified by histochemical analysis after Nicotiana rustica L transient genetic transformation. Conclusions. The created genetic construct can be used to edit the plant genome for both stable and transient genetic transformation to accumulate recombinant Cas9 protein. The guide RNA sequences may be subsequently transferred into such plants using either stable or transient genetic transformation or traditional crossing methods. Keywords: cloning, genetic construction, gus and bar genes, Cas9 endonuclease protein, transient expression.

Aim. Genetic constructs creation for studying the influence effect of the viral posttranscriptional silencing protein suppressor p19 on transient reporter green fluorescent protein (GFP) expression and accumulation. Methods. The Golden Gate molecular cloning method was used to create the genetic constructs; the leafy tissues of the Aztec tobacco plants (Nicotiana rustica L.) were infiltrated with a suspension of Agrobacterium tumefaciens L.; the gfp gene expression level was determined by spectrofluorometric and quantitative protein (Bradford method) assays. Results. As a result of the work, the pSPV2324 genetic construct was created, which contained the reporter gene for the green fluorescent protein gfp and the gene for the synthesis of the viral posttranscriptional silencing protein suppressor p19 and its effect on the accumulation of the recombinant GFP protein was determined. A comparative analysis of the gfp gene expression level without and with the suppressor protein synthesis gene in the genetic vector showed that the fluorescence level of GFP protein in Aztec tobacco tissues was 1.3 times higher during spectrofluorimetric analysis using the p19 suppressor gene construct. Conclusions. The positive effect of the viral suppressor silencing P19 gene on the accumulation of recombinant GFP protein in tissues plants of N. rustica L. was shown for the first time. The increase in GFP protein fluorescence when using the p19 suppressor protein construct in spectrofluorimetric analysis coincides with an increase in the total concentration of total water-soluble proteins and the level fluorescence of GFP protein in their native electrophoretic separation. Keywords: cloning, genetic constructs, transient expression, silencing protein suppressor p19, green fluorescent protein (GFP).

Aim. To establish the optimal concentration of glyphosate for efficient selection of transgenic tissue culture in biotechnology of rapeseed by in vitro selection of glyphosate-resistant and non-resistant winter rape. Methods. As an explants 7–10 mm fragments of 6-day rapeseed hypocotyls were used to cultivate on the medium, supplemented with 1 mg/L of 2,4-dichlorophenoxyacetic acid (2,4-D) for 12 days at 24°C under dark conditions for the initiation of callusogenesis. For regeneration of plants, the MS nutrient medium was supplemented with 3 mg/L of 6-benzylaminopurine (BAP), 2 mg/L of zeatin, 0.1, 0.5 and 1 mM of glyphosate, respectively. As a control, glyphosate-free regenerative nutrient medium was used. The results were statistically processed using Microsoft Excel. Results. It has been shown that glyphosate-susceptible rape explants form leaves and shoots with a frequency up to 8.3 % ± 0.8 % on the medium supplemented with 0.1 mM glyphosate compared to 57.2 % ± 0.6 % in the control. However, the morphogenic structures did not pass selection after transferring shoots to the elongation medium supplemented with 0.1 mM glyphosate. Conclusions. For the in vitro selection of rapeseed 0.1 mM glyphosate can be used in a nutrient medium at the stage of adventitious buds formation. But at the regeneration stage, the amount of herbicide should be increased to avoid false-positive results. Keywords: winter rapeseed, Brassica napus L., in vitro culture, selective marker, herbicide, glyphosate.

Aim. To develop an effective protocol for callus induction from shoot apical meristem in Triticum spelta L. and T. aestivum L. Methods. Plant material: spelt “Europe” and common wheat “Bunchuk”. For this research we used shoot apical meristems from 3-days plants. For callus induction we proposed 4 media with different concentration of 2,4-D, picloram, NAA and AgNO3. Explants were growing in dark during 21 day at + 25 C. Results. Calli were transparent and mild, less than 8 mm. For callus induction positive effect were shown on media with 2,4-D and picloram. At the same time, NAA was not such effective. Conclusions. In our research was shown, that the best media for spelt callus induction should have 2 mg/l 2,4-D and 10 mg/l AgNO3. Keywords: callusogenesis, spelt (Triticum spelta L.), common wheat, callus, shoot apical meristem.

Aim. Creation of genetic constructions to study the effects of various regulatory elements, namely promoters, on the expression of GFP reporter protein. Methods. For creation genetic constructs, the method of molecular cloning Golden Gate was used, which allows the rapid creation of genetic vectors using IIS type restriction enzymes and T4 DNA liga-ses. Results. For research six different promoters were selected, namely the 35S CaMV (Cauliflower Mosaic Virus), double 35S CaMV promoter, promoters of the RbcS2B and RbcS1B genes encoding a small subunit of ribulozobisphosphate carboxylase (RuBisCo) isolated from Arabidopsis thaliana (L.) Heynh.; promoters of genes encoding chlorophyll a-b binding proteins (LHB1B1 and LHB1B2) also isolated from A. thaliana (L.) Heynh. All transcription units additionally contained the following elements: the 5'-untranslated region Ω sequence (5’UTR Ω) from the tobacco mosaic virus TMV (Tobacco Mosaic Virus); the coding sequence of the gene gfp (Green Fluorescent Protein) isolated from A. victoria and the 35S Terminator CaMV with the polyadenylation signal and the 3'-untranslated region sequence. As a result, six genetic constructs with different regulatory elements, namely promoters, have been created. Conclusions. To study the effects of various regulatory elements, namely promoters, on the expression of a GFP repor-ter protein in transient or stable genetic transformation of plants the created genetic constructs can be used.Keywords: cloning, genetic constructs, promoters, Green Fluorescent Protein (GFP).