Effect of LED light on the growth and physiological indices of blueberry

Abstract Light‐emitting diode (LED) is a recent type of light source characterized by low energy consumption and high photoelectric conversion efficiency and can be used in modern smart agriculture. However, there are few published studies on the use of LED light, especially on blueberry ( Vaccinium spp.), despite its importance in boosting the economies of many countries. Therefore, this study was aimed at assessing the effects of light quality on blueberry seedling tissue cultures morphological and physiological parameters with emphasis on the influence of different light wavelengths. In the research, we used white light (i.e., fluorescent lamp) and four treatments of composite LED light (blue wavelength [B]/red wavelength [R] = 1:2 [1B2R], B/R = 1:4 [1B4R], B/R = 2:1 [2B1R], B/R = 4:1 [4B1R]). The results showed that: the number of leaves, stem, and fresh weight increased when exposed to 2B1R; stem length, thickness, and fresh weight were higher in the 1B2R treatment; chlorophyll, carotenoid pigments, peroxidase, and superoxide dismutase were enhanced under treatment 1B2R; soluble sugar, anthocyanin, and proline were greater when exposed to 2B1R; soluble protein was higher with 1B4R; and malondialdehyde increased in the 4B1R treatment. Overall, it can be said that 1B2R LED lights enhanced the selected parameters in blueberry seedlings and can be used as the main light source in the cultivation of blueberry factory seedlings.