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Local cultivars of A. caudatus: Helios and Karmin were used as plant material. Amaranth is a new pseudocereal introduced in Ukraine. The plant biomass of amaranth is used in medicine, food industry and cosmetology industry. Aim. The purpose of the work was to identify the optimal conditions for the transient expression of reporter genes in Amaranthus caudatus cultivars. Methods. Biochemical and microscopy methods were used in the following work. Seedlings and adult plants of different age were infiltrated with agrobacterial suspensions separately (genetic vector pCBV19 with a uidA gene and genetic vector pNMD2501 with a gfp gene in Agrobacterium tumefaciens GV3101 strain). Results. Transient expression of the uidA and gfp genes was obtained in amaranth plants after conduction series of experiments. The most intensive transient expression of gfp and uidA genes was observed in seedlings infiltrated at the age of 1 day. The maximum fluorescence of the GFP protein was observed on 5th–6th days. Conclusions. It was shown that the cultivar Helios was more susceptible to agrobacterial infection than the cultivar Karmin. The effectiveness of Agrobacterium mediated transformation was from 16% to 95% for the Helios cultivar and from 12% to 93% for the Karmin cultivar. The obtained results indicate that the studied amaranth cultivars can potentially be used for obtaining transient expression of target genes and synthesizing target proteins in their tissues in the future.

The research was aimed to develop genetic constructs for Agrobacterium-mediated plant transformation, containing the synthetic cry1Ab gene, and their testing through the transformation of tobacco, followed by a molecular genetic analysis of the obtained plants to confirm the transformation event. Basic methods of DNA cloning, Agrobacterium-mediated transformation of Nicotiana tabacum L. by leaf disc method, selection of transformants in vitro, analysis of the transgene presence in plant DNA, detection of cry1Ab gene expression by PCR with reverse transcription were used. In the course of the study, the vectors pCB182 and pCB241 that contained the synthetic gene cry1Ab were constructed. Agrobacterium-mediated transformation of tobacco was carried out by created vectors and regenerant plants containing transgenes in their DNA were obtained. Expression of cry1Ab transgene in the obtained transformants of tobacco by the RT-PCR method was confirmed. As a result of the Agrobacterium-mediated transformation of plants with pCB182 and pCB241 vectors containing the synthetic cry1Ab lepidopteran resistance gene it is possible to obtain transgenic plants with expression of the transgene.

The aim of the work was to establish the effective culture medium for the regeneration of Physalis peruviana for further micropropagation and obtaining of adult plants from regenerants in vitro conditions. After conducting series of experiments, effective culture media for the regeneration of P. peruviana was established. The most effective media for shoot regeneration from leaf explants were MS30 supplemented with 1mg/l Kin and 3 mg/l BAP; MS30 supplemented with 2 mg/l Kin and 1 mg/l BAP (33.33% of regeneration on both media). Good results were obtained on the media MS30 supplemented with 1 mg/l Kin and 2 mg/l BAP (28.57% explants regenerated) and MS30 supplemented with 2 mg/l Kin and 3 mg/l BAP (26.31% of regeneration). Root induction from stem and leaf explants were obtained of medium MS30 with NAA (0.2 mg/l; 0.5 mg/l), IAA (0.2 mg/l; 0.5 mg/l). Root induction frequency of these media was 100%. The obtained regenerants were separated from the explants and were transferred on the medium MS30 with 1 mg/l of BAP for elongation, and then on a medium MS30 or MS30 with 0.2 mg/l NAA for subsequent rooting. After one month of cultivation on mediums MS30 or MS30 with 0.2 mg/l NAA were successfully received adult plants.

Determination of the presence of the recombinant fusion protein (ESAT6-Ag85B(ΔTMD)-6His) and its accumulation level in duckweed plants (Lemna minor L.) was the aim of the research. ESAT6 and Ag85B are secretory proteins of Mycobacterium tuberculosis and are considered as potential candidates for development of new vaccine against tuberculosis (TB). Transgenic duckweed plants were obtained previously by Agrobacterium rhizogenes-mediated transformation and possessed fusion gene sequence esxA-fbpBΔTMD. Specific polyclonal antibodies were produced in immunized mice to identify levels of accumulation of TB antigens in plants. Recombinant antigen used for mice immunization was obtained in our laboratory by expression in E. coli. Western blot analysis revealed the recombinant tuberculosis antigen ESAT6-Ag85B(ΔTMD)-6His in extracts from transgenic L. minor plants. The level of accumulation of the protein corresponds to 0.4-0.5 µg protein per 1 g of fresh weight of plant. Additionally, the accumulation of recombinant protein was investigated in lyophilized transgenic plants after 1.5 year storage. Duckweed plants accumulating a recombinant analogue of M. tuberculosis secretory proteins can be used for development of plant-based edible vaccines.

The purpose of research was to analyze 10 developed at the Institute of Cell Biology and Genetic Engineering lines of rapeseed to confirm the presence and functionality of the transferred transgene CP4 epsps, as well as the differences among those lines from registered transformation events GT73 and GT200 (Monsanto). During the study extraction of total rapeseed DNA, PCR analysis, electrophoretic separation and visualization of amplicons in agarose gel were conducted, as well as testing of green plants for resistance to glyphosate in greenhouse. The structural difference among 7 transgenic lines from registered transformation events GT73 and GT200 was revealed. Plants showing the presence of synthetic CP4 epsps sequence were resistant to the herbicide in a closed soil. The uniqueness of the obtained transformation events was confirmed, as well as the prospect of using them in breeding.