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Morphology and Leaf Color Changes of Grafted Tomato Plug Seedlings Irradiated by Different Wavelengths of Photosynthetically Active Radiation during Low Light Irradiation Storage  

Park, Jong-Seok (Graduate School of Agricultural and Life Sciences, The University of Tokyo)
Fujiwara, Kazuhiro (Graduate School of Agricultural and Life Sciences, The University of Tokyo)
Publication Information
Journal of Bio-Environment Control / v.17, no.4, 2008 , pp. 283-287 More about this Journal
Abstract
To investigate the effects of different wavelengths of photosynthetically active radiation on the morphology and leaf color changes of a single tomato (Lycopersicon esculentum) seedling, we stored the seedling at $10{\pm}0.5^{\circ}C$ under eight different wavelengths (peak wavelengths; 405, 450, 505, 545, 600, 645, 680, and 700 nm) with a constant photosynthetic photon flux of $3{\mu}mol\;m^{-2}s^{-l}$ for 28 d. Under the 405, 450, and 505 nm wavelength conditions, the leaves of the seedlings showed vigorous shape with an upright morphology. Rachis elongation was suppressed and hence compact appearance was observed under the 450 and 505 urn conditions. Although the difference in leaf color between before storage and on 28 days after storage was observed under all wavelength conditions, the 405 and 700 um irradiations changed the leaf color to light green. Application of light-emitting diode (LED) light irradiated from around 450 to 545 nm can contribute to vigorous shape with an upright morphology of tomato seedlings during low light irradiation-low temperature storage.
Keywords
light-emitting diode; Lycopersicon esculentum; transplant;
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