How Light-Emitting Diodes Affect Plants?
Posted by keelynet on October 9, 2010
Light-emitting diodes are becoming a popular light source, which people use for artificial illumination of plants. Scientists claim that LEDs induced serious changes in plants’ organisms and affected their growth and productivity.
The experiment consisted of growing Chinese cabbage under various light sources:
arc sodium lamp and a bunch of red and blue LEDs in 7:1 ratio.
Maximum of red LED’s emission spectrum is 650 nanometers, and blue LED has emission maximum at 470 nm. These light sources worked with low and normal intensity. When LED’s light intensity was normal, which means fluence rate of photosynthetically active photons was about 400 micromole (per square meter per second), light’s spectral composition affected leaf area.
Leaves, illuminated with LEDs, were two times smaller than those, illuminated with sodium lamp. However, LEDs didn’t affect the number of chloroplasts, leaf’s thickness and cell size.
Illumination with sodium lamp under low light intensity almost stopped photosynthesis (no starch granules formed), however, LED light even increased amount of starch granules, compared to that under high intensity.
All this means that reduced spectrum of LEDs, consisting only of red and blue bands, can seriously alter plant organisms via affecting adaptation mechanisms and chloroplasts. Further optimization of LED light can result in challenging Mother Nature. – Full Article Source
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