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The objectives of this study were to determine the effects of yellow light (Y), green light (G), and two blue lights (B) at different wavelengths in conjunction with red light (R) on the growth and morphogenesis of potato plantlets in vitro. Randomized nodal explants were cut into 1.0–1.5 cm pieces and were grown under five different light conditions: fluorescent white light (FL); the combined spectra of R, Y, and B at 445 nm (R 630 B 445 Y); the combined spectra of R, G, and B at 445 nm (R 630 B 445 G); the combined spectra of R, Y, and B at 465 nm (R 630 B 465 Y); and the combined spectra of R, G, and B at 465 nm (R 630 B 465 G). Morphogenesis and physiological parameters were investigated. The results showed that R 630 B 445 Y and R 630 B 465 Y increased the fresh weight (FW), dry weight (DW), stem diameter, blade number, leaf area, specific leaf weight (SLW), and the health index of potato plantlets in vitro; root activity increased significantly; and soluble sugar, soluble protein, and starch also increased. The addition of Y to the combined spectra of R and B contributed to the growth, development, and morphogenesis more than the combined spectra of R and B with G, and B at 445 nm was more effective at promoting plant growth than was B at 465 nm.

Effects of Yellow, Green, and Different Blue Spectra on Growth of Potato Plantlets In Vitro