Abstract:
Light qualities are considered to affect many plant physiological processes during growth
and development. To investigate how light qualities make an influence on tomato seedlings under
greenhouse conditions, the growth and morphological parameters of tomato seedlings (Fortizia F1RC
hybrid) were studied under three supplemental light irradiations such as light-emitting diodes with
nanoparticle coating (LED 1—Red light-emitting diodes); Blue, Green, Yellow, Red light-emitting
diodes (LED 2), and traditional high-pressure sodium (HPS) lamps with different photosynthetic
photon flux density and the same irradiation time for 33 days. Morphological appearances of three
groups of tomato seedlings were different between light treatments, that is, the plants under LED1 and LED-2 were shorter than those under HPS, while stem diameter, leaf area, dry and fresh
weights, and health indices of tomato seedlings grown under alternative light sources were higher
than of those cultivated under traditional HPS lights. However, the higher plant height was in
plants containing traditional high-pressure sodium lamps treatment. Photosynthetic pigments were
shown to have a significant difference under respective light irradiations of LEDs. The levels of
photosynthetic pigments were higher in the leaves of seedlings under LED 1 and LED 2, and lower
in those that underwent HPS control treatment. Based on the data of morphological and statistical
analysis, LEDs with nanoparticle coating proved to be beneficial factors for the growth of tomato
seedlings under greenhouse conditions.
