Abstract
This research is aimed at the assessing the impact of the ultraviolet radiation in the A, B, and C ranges (as additives to the main light) on general plan condition, the stress experienced by them, the pigment concentration in the leaves and leaf reflective characteristics. Under studying, there were the photo-protective reactions of the purple variety basil plants. The plants were grown in plastic pots in a phyto-chamber equipped with an automatic microclimate system. The phyto-chamber was divided into four compartments where, in addition to the main lighting, there were installed the additional LEDs emitting their radiation in the ranges UV-A, UV-B, and UV-C. Plant reactions were evaluated by the contents of the main pigments as detected by the spectrometric method. Then correlations were revealed between those values and the vegetative indices obtained based on the hyperspectral images. A strong correlation (R2 ˃ 0.83) was observed between the values of the vegetative indices ARI and mARI and the anthocyanins concentration in basil leaves. A weak correlation (R2 = 0.0479) was found between the ARI and mARI values and the carotenoids index CRI700, which is attributed to the shielding effect of the anthocyanins. Deviations in the results are influenced by leaf surface unevenness, its thickness and density. Additional research is needed including developing reflection indices taking into account the shielding effect of the purple pigments.
Highlights
The negative anthropogenic impact on the Earth biosphere results in such serious climatic changes as the growth of atmosphere and ocean annual average temperatures, the formation of greenhouse gases in large amounts, the ozone layer depletion and rises the UV radiation intensity
The exposure to UV-A, UV-B, and UV-C had a significant impact on the basil growth and development
It was found that the UV-A and UV-B irradiation did stimulate the basil plants growth and development, there was observed a variety-specific reaction of the “Red Ruby” variety to the UV-A and UV-B irradiation
Summary
The negative anthropogenic impact on the Earth biosphere results in such serious climatic changes as the growth of atmosphere and ocean annual average temperatures, the formation of greenhouse gases in large amounts, the ozone layer depletion and rises the UV radiation intensity. In many publications devoted to this problem, the influence was studied of the light spectral composition on the plants’ growth and development; and the mechanisms of plant protection from the UV radiation were described including pigment synthesis and accumulation processes, the features of accumulation of the secondary metabolites and the functions of those substances [7,8,9,10]. It is well-known that in small doses, UV radiation can stimulate metabolic processes, thereby inducing a strengthening effect in plants [11]. The addition of UV spectrum rays to the main illumination will allow obtaining green and vegetable crops with the specified characteristics in terms of the contents of acids, sugars, anthocyanins and antioxidants and thereby increasing the nutritional value and taste qualities of the products
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