Plant growth and development strongly influenced by light quantity and its spectral composition. Young tomato plants were cultivated in growth cabinets under artificial light provided by red and blue light emitting diodes(LEDs) during 12 hours, then plants were exposed to monochromatic ultraviolet, blue, green and red lights as an end-of-day(EOD) treatment during 4 hours to study their effect on plant growth parameters. EOD lighting from various LEDs increased total fresh and dry weights as well as assimilation area compared to those in control. Blue light increased stem height, internode length and stem diameter. Monochromatic UV-A light reduced stem elongation, highly increased stomatal conductance. Compactness and health index of young tomato plants were increased in UV-A and red light treatments.

Introduction
 Materials and Methods
  1 Plant materials and growth conditions
  2 Light treatments
  3 Leaf gas exchange parameters
  4 Plant Growth Analysis
  5 Statistical analysis
 Results and Discussion
 Acknowledgement
 References

• Bekhzod Khoshimkhujaev(Protected Horticulture Research Institute, National Institute of Horticultural & Herbal Science, Haman, 52054, Korea)
• Joon Kook Kwon(Protected Horticulture Research Institute, National Institute of Horticultural & Herbal Science, Haman, 52054, Korea)
• Jae Han Lee(Protected Horticulture Research Institute, National Institute of Horticultural & Herbal Science, Haman, 52054, Korea)
• Hyo Gil Choi(Protected Horticulture Research Institute, National Institute of Horticultural & Herbal Science, Haman, 52054, Korea)
• Kyoung Sub Park(Protected Horticulture Research Institute, National Institute of Horticultural & Herbal Science, Haman, 52054, Korea)
• Nam Jun Kang(Institute of Agriculture and Life Science, Gyeongsang National University, Jinju, 52828, Korea) Corresponding author