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2 Institute of Plant Genetics and Biotechnology of the Slovak Academy of Sciences, P. O. Box 39 A, Akademická 2, 950 07 Nitra, Slovak Republic After “floral-dip” transformation of Amaranth plants with Agrobacterium tumefaciens strain GV3101 carrying pCBV19 gene vector that contained bar and gus genes, transgenic seeds were obtained. The functioning of the tran+sferred genes in Amaranthus tissues was confirmed with herbicide selection (PPT herbicide – phospinotricin) and gus gene activity. Positive results were obtained for cultivars “Karmin” and “Kremoviy rannii”. The percentage of GUS positive samples was 1% (for “Karmin”), 2.2% (for “Kremoviy rannii”) from the total initial quantity of plants that was prior to selection with the herbicide. The seeds of six amaranth cultivars were received after treatment with A. tumefaciens by the method “floral dip”. The lowest lethal dose of herbicide PPT was established – 40 mg/l. After spraying with herbicide, resistant plants were obtained for cultivars: “Kremoviy rannii” (21%) and “Karmin” (20%). After conduction of PCR analysis, positive results were obtained for four cultivars. The percentage of bar positive plants was 0.3% (“Helios”); 0.26% (“Sterkch”); 0.06% (“Kremoviy rannii”); 0.3% (“Rushnichok”) from total initial quantity of plants.

“Floral-dip” transformation of Amaranthus caudatus L. and hybrids A. caudatus × A. paniculatus L.