The quality of facility horticultural crops is an important indicator to measure the commodity value of their products. International research on the nutrition of horticultural products is in the ascendant. The utilization and adjustment of ultraviolet light in plant factories are very important to ensure high quality and high yield. The artificial control of UV light source is applied to supplement the UV radiation technology in the facility, which can reduce the use of chemical methods to prevent vegetable growth and improve vegetable quality. It is an important guarantee for the production of green organic food. So far, medium and long wave ultraviolet light supplements the nutritional quality of facility vegetables. In particular, there are few reports on the regulation mechanism of antioxidant substances, and there is a lack of effective light environment management and regulation technology.
Li and Kubota (2009) found that different LED light quality under fluorescent light has an effect on the nutritional quality of lettuce during the bright period. The addition of UV-A increased the anthocyanin content by 11%. Caldwell and Briz (2006) studied the effects of supplemental UV-A and UV-A+UV-B treatments on carotenoids and chlorophylls of eight green leaf and red leaf lettuce varieties.
The results showed that UV-B increased the carotenoid and chlorophyll content of green leaf lettuce, but decreased the carotenoid and chlorophyll content of red leaf lettuce. The difference in response of green and red leaf lettuce to UV-A and UV-B radiation may be a light-dependent change in the level of phenolic phytochemicals. Compared with green leaf lettuce, UV induced phenolic phytochemicals in red leaves may reduce the photoprotection requirements of carotenoids in chloroplasts. Supplement UV-B exposure to greenhouse tomatoes.
Supplement UV-B exposure to greenhouse tomatoes. The results show that high-dose UV-B reduces the content of lycopene and vitamin C, and low-dose UV-B can increase the content of lycopene and vitamin C. Tsormpatsidis et al. (2008) studied the growth of lettuce and the production of anthocyanins, flavonoids and phenols under different UV radiation penetration membranes. Films include UV-permeable films, films that can transmit 320m, 350nm, 370m, and 380mm, and films that are completely opaque to UV radiation. The results showed that the dry weight of lettuce under a completely UV-opaque film was 2.2 times that of lettuce grown under a completely UV-permeable film; on the contrary, the anthocyanin content of lettuce under a completely UV-permeable film was larger than that of a completely UV-permeable film. 8 times the lettuce under the impermeable membrane.
Application of UV radiation in plant factories
The quality of facility horticultural crops is an important indicator to measure the commodity value of their products. International research on the nutrition of horticultural products is in the ascendant. The utilization and adjustment of ultraviolet light in plant factories are very important to ensure high quality and high yield. The artificial control of UV light source is applied to supplement the UV radiation technology in the facility, which can reduce the use of chemical methods to prevent vegetable growth and improve vegetable quality. It is an important guarantee for the production of green organic food. So far, medium and long wave ultraviolet light supplements the nutritional quality of facility vegetables. In particular, there are few reports on the regulation mechanism of antioxidant substances, and there is a lack of effective light environment management and regulation technology.
Li and Kubota (2009) found that different LED light quality under fluorescent light has an effect on the nutritional quality of lettuce during the bright period. The addition of UV-A increased the anthocyanin content by 11%. Caldwell and Briz (2006) studied the effects of supplemental UV-A and UV-A+UV-B treatments on carotenoids and chlorophylls of eight green leaf and red leaf lettuce varieties.
The results showed that UV-B increased the carotenoid and chlorophyll content of green leaf lettuce, but decreased the carotenoid and chlorophyll content of red leaf lettuce. The difference in response of green and red leaf lettuce to UV-A and UV-B radiation may be a light-dependent change in the level of phenolic phytochemicals. Compared with green leaf lettuce, UV induced phenolic phytochemicals in red leaves may reduce the photoprotection requirements of carotenoids in chloroplasts. Supplement UV-B exposure to greenhouse tomatoes.
Supplement UV-B exposure to greenhouse tomatoes. The results show that high-dose UV-B reduces the content of lycopene and vitamin C, and low-dose UV-B can increase the content of lycopene and vitamin C. Tsormpatsidis et al. (2008) studied the growth of lettuce and the production of anthocyanins, flavonoids and phenols under different UV radiation penetration membranes. Films include UV-permeable films, films that can transmit 320m, 350nm, 370m, and 380mm, and films that are completely opaque to UV radiation. The results showed that the dry weight of lettuce under a completely UV-opaque film was 2.2 times that of lettuce grown under a completely UV-permeable film; on the contrary, the anthocyanin content of lettuce under a completely UV-permeable film was larger than that of a completely UV-permeable film. 8 times the lettuce under the impermeable membrane.