Document Type : Full Paper
Authors
1
Master's degree graduated, , Department of Horticultural Sciences and Green Space, Faculty of Agriculture, University of Zabol, Zabol, Iran
2
Assistant Professor, , Department of Horticultural Sciences and Green Space, Faculty of Agriculture, University of Zabol, Zabol, Iran
3
Department of Agriculture and Plant Breeding, Agriculture Institute, Research Institute of Zabol, Zabol, Iran
4
Assistant Professor, Department of Horticultural Sciences, Faculty of Agriculture, Shahid Chamran University of Ahvaz, Ahvaz, Iran
Abstract
In order to evaluate the effect of supplemental LED light on morphological and phytochemical characteristics of Clitoria, an experiment was conducted in 2023. The experimental treatments included the control (without supplemental light), supplemental blue light, supplemental UVA light, blue light + UVA with a ratio of 1:1, blue light followed by UVA, UVA light followed by blue light. The results showed that supplementary blue light and UVA significantly reduced the height of the blue pea. The fresh and dry weight of shoot in the blue light treatment was higher than other supplementary light treatments, but there was no significant difference with the control. The content of photosynthetic pigments increased with supplementary blue light irradiation, and blue light irradiation could increase the content of chlorophyll a, b and carotenoid by 2.39, 2.31 and 3.32 times, respectively. Blue LED light led to an increase of 2.84 and 2.39 times in the content of anthocyanin and flavonoid compared to sunlight. Changes in phenol content showed that alternating exposure to UVA then blue light led to a 18.2 fold increase in phenol content compared to the control. The activity of tannins increased significantly with blue light. Blue light increased the tannin content compared to the control, UVA light irradiation and alternating UVA then blue irradiation by 1.63, 1.67 and 1.54 times, respectively. In general, it seems that blue supplementary light leads to the improvement of the quality characteristics of Clitoria.
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