LIGHT-EMITTING DIODES: ON THE WAY TO COMBINATORIAL LIGHTING TECHNOLOGIES FOR BASIC RESEARCH AND CROP PRODUCTION
Recently developed high-brightness light-emitting diodes (LEDs) offer new opportunities in the future plant lighting technologies. Application of the new-generation of light sources provide remarkable conditions for the control of photomorphogenesis in plants, accelerating the breeding cycles, improving food quality, and energy saving. LEDs appear to be powerful instruments for light spectrum manipulation for crop growth regulation. Combinatorial lighting technologies will emerge on the basis of LED application: variable-spectrum lighting modules could be designed using various combinations of high-power monochromatic (narrow-band) LEDs. In our experiments, we studied application of LEDs with the narrow-bandwidth wavelength emissions in the photocontrol of basic physiological processes in several vegetable and ornamental crops. Plants were grown in controlled environment. PPF was provided by LED panels which were composed of blue and red light LEDs with the peak wavelengths at 460, 635, and 660 nm, respectively. Various spectral photon distribution in the long-wave region was provided using 635 and 660 nm LEDs separately or in combination. Changes in plant growth responses, phase transitions, pigment accumulation were observed in various light environments. Experimental data show that different LED systems with discrete wavelength ranges peaking at blue and red spectral regions can be used effectively both for basic research of plant photomorphogenesis and for the fine tuning of physiological processes in plants and optimization of the species/cultivar light regimes.
Tarakanov, I., Yakovleva, O., Konovalova, I., Paliutina , G. and Anisimov, A. 2012. LIGHT-EMITTING DIODES: ON THE WAY TO COMBINATORIAL LIGHTING TECHNOLOGIES FOR BASIC RESEARCH AND CROP PRODUCTION. Acta Hort. (ISHS) 956:171-178
photomorphogenesis, light-emitting diodes, combinatorial lighting technologies, Brassica juncea, Lactuca sativa, Ocimum gratissimum, Coleus blumei, Tagetes patula