The influence of LED light spectra on the in vitro growth of grapevine plants

Abstract

In this study, the influence of different LED light spectra on the rooting, growth, and development processes of grapevine shoots under in vitro culture conditions were investigated. Photometric measurements were conducted for three types of LED-based artificial light sources (Osram, Germany), with variations in parameters such as PPFD, DLI, and color temperature (T). The study results indicated that the development of both the aboveground and underground parts of the vitroplants was most strongly stimulated by illumination with the "white- warm" spectrum, where T ≤3200 K, PPFDmax = 30 μmol·s−1·m−2, and DLImax = 2.04 mol·m−2·d−1 "white-warm". Presented the weakest results, on the studied morphological parameters, illumination with the "white-cool" spectrum, characterized by T = 6000K, PPFD=63 μmol·s−1·m−2, and DLImax=4.05 mol·m−2·d−1. “Fito” light spectrum, characterized by parameters T ≤1700 K, PPFDmax =25 μmol·s−1·m−2, and DLImax =1.64 mol·m−2·d−1, Overall, the type of illumination had a moderate impact on grapevine plants cultivated under controlled in vitro conditions.