Importance of `Blue' Photon Levels for Lettuce Seedlings Grown under Red-light-emitting Diodes
1992/05/01 by M.E. Hoenecke, R.J. Bula, R. J. Bula +2 · 24 citations
Agricultural and Biological Sciences · #Light effects on plants #Greenhouse Technology and Climate Control #Plant Molecular Biology Research
paper · pdf · doi:10.21273/hortsci.27.5.427
Abstract
Light-emitting diodes (LEDs) with high-intensity output are being studied as a photosynthetic light source for plants. High-output LEDs have peak emission at approximately 660 nm concentrated in a waveband of +/- 30 nm. Lettuce (Lactuca sativa Grand Rapids') seedlings developed extended hypocotyls and elongated cotyledons when grown under these LEDs as a sole source of irradiance. This extension and elongation was prevented when the red LED radiation was supplemented with more than 15 micromoles m-2 s-1 of 400- to 500-nm photons from blue fluorescent lamps. Blue radiation effects were independent of the photon level of the red radiation.
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