Optimization of microclonal reproduction of potato wart cultivar-differentiators

Abstract

Goal. To study the influence of ammonium salts of dihydropyrimidine to the formation of microtubers and the productivity of potato wart cultivator differentiators in vitro. Methods. The research was conducted in 2019—2020 in the Laboratory of Biotechnology for Agricultural Crops of Ukrainian Plant Quarantine Research Station Institute of Plant Protection of NAAS. Derivatives of ammonium salts of dihydropyrimidine were synthesized at the Department of Organic Chemistry Institute of Biology, Chemistry and Bioresources of Chernivtsi National University. The material for the research was potato wart cultivar-differentiators of different maturity groups Slovyanka (medium ripe), Chervona Ruta (medium late). The plants were grown on Murashige-Skuga nutrient medium with addition of ammonium salts of dihydropyrimidine at different concentrations (0.1; 0.2; 0.3 mg/l) in a cultivation room at 16-hour photoperiod with a light intensity of 2000—2500 lux, temperature 22—25°C and humidity of 60—80%. Results. It was determined that high morphometric parameters and intensity of tuber formation of different varieties of maturity Slavyanka and Chervona Ruta in vitro culture provides the addition to the nutrient medium of ammonium salts of dihydropyrimidine with a concentration of 0.3 mg/l: plant height was 4.6 and 4.1 cm compared with the control of 4.0 and 3.7 cm, respectively. The number of internodes in both varieties were 5.3 pieces (in control — 4.5 pcs.) and the optimal number of microtubers on the 60th day — 79.1 and 81.3%. Conclusions. The effect study of different concentrations of ammonium salts of dihydropyrimidine on the productivity of potatoes in vitro in different varieties of maturity Slavyanka and Chervona Ruta showed that the optimal performance provides cultivation at a concentration of ammonium salts of dihydropyrimidine 0.3 mg/l: weight of the average microtuber is 22 and 195.4 mg, the mass of microtubers per plant — 185.5 and 174.4 mg, the number of microtubers per plant — 1.01 and 0.87 pcs.