The influence of lighting spectral composition on physiological response of potato in vitro

Abstract

The microclonal (in vitro) propagation of the original potato plants is important stage in the cultivation of high-quality seed potato. The appropriate microclimate parameters (illumination, temperature, air humidity) are to be maintained in phytotrons for optimal clones’ growth. It is necessary to consider the specific response of potato varieties and, according to it, carefully select the lighting spectral composition. The purpose of the work was to study the effect of various light sources on the morphological parameters of 22 varieties of potato microplants. 10 clones of every variety were selected for the experiment after the initial multi-varietal analysis. After 27 days of cultivation, growth parameters were measured: root length, plant height and the number of internodes. The light sources were light-emitting diode (LED) irradiators ECOLED-BIO-195W-D120 FMatrix IP66, ECOLED-BIO-112-185W-D120 UniversalLED, and 3-ECOLED-60-LX Fito IP65 (“SET” ltd). For the first time, data on the lighting effect on a large sample of potato varieties were obtained, demonstrating significant differences in the physiological response of plants to lighting conditions. According to the research results, it was shown that ECOLED-60-LX Fito IP65 was the optimal source of photosynthetically active radiation for plants among the studied LED-lamps, providing a positive effect on the growth parameters of potato plants, including plants height, length of roots and internodes amount.