EFFECT OF SPECTRUM OF THE LIGHT-EMITTING DIODE LIGHTING UPON THE PROCESSOF MICROPROPAGATION OF THE VIRUS-FREE POTATO PLANTS OF DIFFERENT VARIETIES
Production of the high-quality original and high rates of reproduction of potato varieties are based on seeds usage of biotechnological methods of recovery and subsequent microclonal reproduction in vitro culture. The process of micro-propagation of the potato plants takes place in the cultivation areas under artificial lighting. Light is one of the important factors regulating morphogenesis of the plants. The goal of this research was to study effect of the spectral composition of the LED lighting upon the process of reproduction in vitro of microplants of 14 potato varieties; the choice of the optimal, cost-effective spectrum of artificial light. The process of the in vitro growth of potato plants on the two lighting options was studied: using LED lamps SPB-T5-eco with white cold light and joint lighting using SPB-T5-eco with SPB-T8-phyto, which allows to bring the spectrum of the artificial lighting to the spectrum of natural sunlight. As a result of the research it was found that the maximum ability to reproduce in vitro on two versions of lighting, showed the micro-potato plants of varieties Gala, Memory of Rogachev, Zhukovsky early; and using LEDs with white cold light the plants of varieties Bryansky delicacy, Impala. By the dispersion analysis there was revealed a significant effect of the variety genotype (factor A) and the interaction of factors A and B (the lighting variant) upon the multiplication factor, as well as the absence of significant differences between the studied LED lighting variants. There was presented economic effect of usage LEDs with white cold light.