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Different Ratios of Red and Blue LED Light Affect Coriander Productivity and Antioxidant Properties.

Naznin, M.T., Gravel, V., and Hao, X.M. 2016. "Different Ratios of Red and Blue LED Light Affect Coriander Productivity and Antioxidant Properties.", Acta Horticulturae (ISHS){1134/223-229}.

Abstract

Light emitting diodes (LEDs) can be selected to target the wavelengths absorbed by plants, enabling the users to customize the wavelengths of light required for maximum production. The purpose of this study was to evaluate the growth and antioxidant accumulation in coriander plants cultured under various ratios of red to blue LEDs. Four light treatments including: red LEDs (100%) and three ratios of red (661 nm) to blue (449 nm) LEDs light (5:1, 10:1 and 19:1) at 120 μmol m-2 s-1, were applied for this study. Coriander plants were cultured under different ratios of red to blue LEDs and were found to have an increase in the leaf and shoot number and fresh and dry mass than those plants cultured under 100% red LEDs. The highest fresh and dry mass accumulation were observed in plants cultured under the 10:1 ratio of red to blue LEDs but were not significantly different from the 19:1 ratio of red to blue LEDs. The coriander plants cultured under 100% red LEDs showed a significant decrease in antioxidant properties. This research will allow for improved selection of red to blue ratios of LEDs lighting for antioxidant rich leafy vegetables or spice production.

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