Page 180 - Zbornik_Konf_2019

https://doi.org/10.15414/2019.9788055220703

4 International Scientific Conference Abstracts Book
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EFFECTS OF DIFFERENT LED LIGHTING ON GROWTH AND NUTRITIONAL QUALITY OF
LETTUCE (LACTUCA SATIVA L.)
Ljudmila Lioshyna, Olga Bulko

Institute of Cell Biology and Genetic Engineering, National Academy of Sciences of Ukraine,
Kyiv, Ukraine; E-mail.: llioshina@ukr.net
Lettuce (Lactuca sativa L.) is a widespread culture of the Asteraceae family, rich in
vitamins and minerals. The lettuce is grown all year round in a greenhouse, grows quickly and
has great commercial value.
Greenhouse production depends on the use of artificial lighting. In light-culture
conditions, only LED (light-emitting diodes) lighting saves energy and enables the
combination of light of different wavelengths to select the optimal spectral composition. Salad
is sensitive to the quality of light and there are reports that lighting with different spectral
composition affects the morphological and biochemical characteristics of the plant (Lin et al.,
2013; Zhang et al., 2017).
In this study, we showed the effect of LED lighting of different spectral composition on
photomorphogenesis and secondary metabolism of lettuce, variety Lollo Rossa. The plants
were exposed to such spectra LED lights: white light (W), monochrome red light (R),
monochrome blue light (B), and and red/blue ratio lights R / B – 1.3 /1; 2.3 / 1; 4/1; 1/ 1.7.
PPF – 320 μmol quanta m s , photoperiod – 16/8 h. Luminescent lamps with such
-2 -1
characteristics were used as a control: luminous flux – 1050 lm; color temperature – 6500K.
Here, luminescent lighting and white LEDs ensured equal growth and quality of the
product. The combination of R / B – 1 / 1.7, where the proportion of blue light increases, is
most effective for the accumulation of biomass of lettuce (by increasing the area and number
of leaves). We also demonstrate that red / blue 1.3 / 1 and 2.3 / 1 combinations stimulate the
production of vitamin C in a salad. Blue light promotes photosynthesis and growth,
stimulating morphological and physiological reactions. Illumination with monochrome blue
light shortens the internode, it can be used when growing seedlings in the greenhouse. The
combination of R / B – 4/1 increases the content of soluble sugar and protein and improves
the phenotypic characteristics, including plant height, stem diameter, and fresh weight.
The results showed that the ratio R / B – 4/1 can effectively improve the quality of
lettuce, which will provide valuable information for optimizing the conditions for growing
lettuce in production.
Since LED lighting with adjustable spectral composition can improve the productivity
and nutritional characteristics of lettuce while reducing production costs in large-scale
industrial production, it makes sense to use this technology more extensively in greenhouse
lighting.

Keywords: Lactuca sativa, light-emitting diodes, spectral composition.

|180 4 International Scientific Conference Agrobiodiversity Nutrition, Health and Quality of Human and Bees Life
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September 11–13, 2019