2018 ASHS Annual Conference
Effect of Light Qualities Modified By Dye-Sensitized Solar Cells and Light-Emitting Diodes on Plant Shape, Growth and Flowering of Petunia
Dye-sensitized solar cell (DSC) can be used as a greenhouse glazing material because it is translucent with various colors and produces electricity. However, light quality under DSC is different to that of sunlight and its transmittance of visible light is low. Therefore, we compared the growth and physiological responses of petunia (Petunia ×hybrida), a very sensitive plant to light condition, under transparent glass and red-colored DSC. Petunia ‘Madness Red’ were grown in transparent (T, the control), shading (S), and DSC (D) chambers maintained at 23±2℃, and DSC chambers supplementally lighted with light-emitting diodes (LEDs) (D+L) of blue (B), green (G), white (W), B+G, and R+B+W colors for 16 hours from 06:00 to 22:00 with 60 μmol·m-2·s-1 PPFD. S and D increased plant height compared with T, and D+L(W) LEDs decreased plant height to the level of T. Plant height under D+L(G) was higher than D, whereas that of D+L(R+B+W) was lower than T. Number of leaves and shoot weights decreased under S and D compared with T, and supplemental lighting with all the LEDs significantly increased number of leaves and shoot weight to the lower level under T. Chlorophyll content decreased under S and D and was recovered to the level of T by LED supplemental lighting except for G. Whereas root weight under LEDs was higher than that under T. So T/R ratios under D+L(B) and D+L(B+G) were lower than that under T. In addition, DSC delayed flowering compared with T, whereas LED lighting except for R+G+B enhanced flowering compared with T. The flower color under T, D+L(B) and D+L(B+G) was darker and redder than that under S and D. In conclusion, petunia grown under DSC had stretched stems and less leaves, lighter biomass, later flowering date and lighter flower color compared with T. Supplemental lighting by LEDs with blue wavelength under DSC improved growth, flowering and plant quality such as plant form and flower color.
This work was supported by the Korea Institute of Energy Technology Evaluation and Planning (KETEP) and the Ministry of Trade, Industry & Energy (MOTIE) of the Republic of Korea (No. 20163030013800).