Technical Paper
Toward an Understanding of Blue Light Effects on Diverse Species: Implications for Advanced Life-Support Systems
1999-07-12
1999-01-2108
‘Blue’ photons are energetically expensive to produce, so the most energy-efficient lamps contain the least amount of blue light. ‘Blue’ photons are not used as efficiently in photosynthesis as ‘red’ photons, but blue light has dramatic effects on plant growth. We studied the growth and development of soybean, wheat, and lettuce plants under high pressure sodium and metal halide lamps with yellow filters creating 5 fractions of blue light (< 0.1%, 2%, 6%, 12%, and 26%) at 200 and 500 μmol m-2 s-1 PPF. The response of dry mass, stem length, leaf area, SLA, and tillering/branching to blue light was species dependent. Blue light fraction determined the stem elongation response in soybean, whereas the absolute amount of blue light determined the stem elongation response in lettuce. Lettuce was highly sensitive to blue light fraction between 0% and 6% blue, but results were complicated by sensitivity to lamp type. For the parameters we studied, wheat did not respond to blue light.
