## 3 Results and Discussion
### Analysis of Pigment Content  
In the case of the \"Red Ruby\" variety: on the 30 th and 45 th days of the cultivation, the UV radiation had no significant effect on the chlorophyll concentration in leaves; the average concentration in all groups was 4.8-5.5 mg/g (Figure 2). In all the observed groups, the average carotenoids concentration in the leaves was approximately 1 mg/g (Figure 3). No significant effect of the UV radiation on the average carotenoids concentration in the  
Figure 1: Basil plants of varieties “Red Ruby”, “Gastronome” and “Markus” on 45 th and 60 th days of cultivation; from left to right: control, UV-A, UV-B, and UV-C.  
leaves was revealed. The ratio of total chlorophyll to carotenoids showed that the plants actively photosensized; there were no signs of a physiological aging.  
The \"Gastronome\" variety showed the greatest increase in the concentration of chloroplasts (by 17%) and carotenoids (by 25%) in the group with UV-A radiation on the 45 th day of the cultivation. In the other variants of the UV irradiation, there was no significant differences from the control group.  
The \"Markus\" variety showed a noticeable UV radiation effect on the average concentration of leaf total chlorophyll, mainly, on the 30 th day of the cultivation. All the UV irradiation sources reduced the total chlorophyll concentration; along with this, the pattern changes in the carotenoid concentration differed from that of the chlorophyll. Carotenoids reduce the stress effect and protect the chlorophyll molecules from destruction caused by the light during the photo-oxidation [30]. Judging on the change in the ratio of carotenoids and chlorophylls, it can be concluded that the UV-C irradiation caused the greater stress and provoked the protective reaction emergence of the photosynthetic system of the basil plants of the \"Markus\" variety during the active growth period (on 30 th day).  
Analyzing the anthocyanin concentration in the plant leaves, it is found that in the \"Red Ruby\" variety, the average anthocyanin concentration in the leaves depends strongly on the exposure of the UV-A, UV-B, and UV-C irradiation. The UV-C radiation had the greatest effect on the 60 th day of the cultivation (Figure 4). All groups differed with the UV radiation range, and there was observed a significant increase in anthocyanin concentration in leaves between the 45 th and 60 th day of cultivation by about 20-30%. In the case of the \"Gastronome\" variety, the average anthocyanin concentration in the leaves on the 60 th day of the cultivation under the UV irradiation of different ranges has no significant difference from the control group. In the experiment variants of the \"Markus\" variety, the average anthocyanin concentrations obtained on the 30 th, 45 th and 60 th days of the cultivation are the highest in the variants with the UV-B and UV-C radiation.  
Figure 2: Average concentration of chlorophylls (a+b) in leaves, mg/g. Obtained on 30 th, 45 th and 60 th days of cultivation of following basil varieties: “Red Ruby” (**a**), “Gastronome” (**b**) and “Markus” (**c**).  
Figure 4: Average anthocyanins concentration on 30 th, 45 th and 60 th day of cultivation of basil “Red Ruby” (**a**), “Gastronome” (**b**) and “Markus” (**c**).  
Figure 3: Average concentration of carotenoids in leaves. Obtained on 30 th, 45 th and 60 th days of cultivation of following basil varieties: “Red Ruby” (**a**), “Gastronome” (**b**) and “Markus” (**c**).  
The high anthocyanins concentration in the variety \"Red Ruby\" on the 60 th day of the cultivation indicates a greater response to the UV stress caused by the high-intensity lighting and the UV irradiation during budding and flowering than in the varieties \"Gastronome\" and \"Markus\".  
Most probably, the higher carotenoids concentration in the varieties \"Gastronome\" and \"Markus\" is attributed to the fact that due to the lower anthocyanins concentration, they take on the photo-protective function.