Mixed red and blue light promotes ripening and improves quality of tomato fruit by influencing melatonin content

Response of Tomato Fruit Quality Depends on Period of LED Supplementary Light

“…Our study showed that light supplementation for 3 h in the morning and 3 h in the evening promoted the accumulation of Ca in tomato fruits, but light supplementation for 3 h in the morning decreased the contents of P, Cu, Fe, and Zn in tomato fruits, and light supplementation for 3 h in the evening decreased the contents of K, Mg, Na, Cu, Fe, and Mn (Table 1). Some studies have found that red-blue light LED can promote the ripening of tomato fruit by increasing the content of melatonin in tomato fruit (27). In the process of tomato fruit ripening, some mineral content in tomato fruit will decrease to a certain extent (57).…”

“…For example, compared with white light, a combination of red and blue (R:B, 3:1) LED illumination has been shown to increase the contents of soluble solids, glucose, fructose, and sucrose in tomato fruits by promoting the accumulation of proteins related to glucose metabolic pathways (25), whereas compared with lighting using high pressure sodium lamps, LEDs have been found to significantly increase the content of lycopene in tomato fruits (26). Similarly, a combination of red and blue LEDs has been demonstrated to promote lycopene biosynthesis and the accumulation of carbohydrates by increasing the contents of melatonin in tomato fruits (27), whereas either blue or a combination of red and blue LEDs was found to increase the contents of potassium and beta carotene in fruits by promoting the absorption and transport of potassium by tomato roots (28). Furthermore, it has been observed that blue light LEDs can significantly increase the contents of soluble solids, lycopene, and phenolic compounds in post-harvest tomato fruits (29), whereas high-intensity blue light LEDs can stimulate the antioxidant system in tomato fruit, thereby enhancing the ascorbic acid content (30).…”

A Machine Learning Model for Photorespiration Response to Multi-Factors

“…Positive coordinates were to the span direction (east, x-axis) and the length direction (north, y-axis). Thus, the greenhouse was divided into a total of nine sections, with the location labels of each section being (3,2), and (3,3).…”

“…Photosynthesis is a crucial factor in crop yield formation. Besides the extrinsic factors such as microclimate around the crop, including light intensity [1,2], CO 2 concentration [3], temperature [4], and humidity [5], there are many intrinsic factors affecting the rate of photosynthesis, such as photorespiration, leaf age, chlorophyll content, and genes. In particular, photorespiration is a process closely related to photosynthesis, which physiologically reduces the efficiency of photosynthesis.…”

“…There are 45 items in the photosynthesis model, and the 16 items with the highest absolute values of each coefficient are selected in the table;2 There are 169 items in the photorespiration model, and the 16 items with the highest absolute values of each coefficient are selected in the table.…”