Influence of the Nutrient Medium and Photoperiod on Tuberization of Potato Micro-plants of Promising Potato Varieties in vitro Culture

The results of studies on the influence of the nutrient medium and photoperiod on tuberization of micro-plants of promising potato cultivars in an in vitro culture under are presented the conditions of a potato renewal laboratory at the Udmurt Research Institute of Agriculture of the Udmurt Federal Research Center of the Ural Branch of the Russian Academy of Sciences in 2018. Two experiments were carried out to identify patterns of the influence of potato cultivation conditions in vitro on the efficiency of its propagation and to develop an improved method for propagating potato micro-tubers in vitro. The experiments were carried out in accordance with the recommendation “New technologies for the production of healthy source material in elite potato seed production”, “Technologies for microclonal propagation of plants”. Object of research: micro-plants of potato varieties Alena, Charodei, Nayada. The studied variants of sugar concentration are 0%, 2% (control), 4%, 6%, 8%, 10%. The studied photoperiod options are 16 hours (control), 14 hours, 12 hours, 10 hours, 8 hours, 6 hours, 4 hours. Based on the results of studies in 2018, experimental data were obtained. It was revealed that the lack of sugar in the nutrient medium negatively affects the growth and development of potato micro-plants. An increase in sugar concentration to 6–10%, in comparison with the control (2%), significantly increases the tuber-forming ability of micro-plants by an average of 6.1–7.2% and increases the number of tubers from one micro-plant. The highest yield of micro-tubers from one micro-plant on average for varieties was obtained with a 14-hour photoperiod and amounted to 1.3 pcs. With a 12-hour photoperiod, micro-tubers begin to form 7–14 days earlier than in the other variants of the experiment.