The effect of light quality on plants

740 Published by admin Jan 13,2021

Different light qualities or wavelengths of light have significantly different biological effects, including different effects on the morphological structure and chemical composition of plants, photosynthesis, and organ growth and development. Red light Red light generally inhibits internode elongation of plants, promotes tillering, and increases the accumulation of chlorophyll, carotenoids, soluble sugars and other substances. Red light can promote the growth of leaf area and β-carotene accumulation of pea seedlings; lettuce seedlings are pre-irradiated with red light and then applied with near-ultraviolet light. It is found that red light can enhance the activity of antioxidant enzymes and increase the content of near-ultraviolet absorption pigments, thereby reducing near-ultraviolet light. Ultraviolet light damages lettuce seedlings; full-light experiments on strawberries found that red light is beneficial to increase the content of organic acids and total phenols in strawberries. Blue-ray Blue light can significantly shorten the pitch of vegetables, promote the horizontal extension of vegetables and reduce leaf area. At the same time, blue light can also promote the accumulation of plant secondary metabolites. In addition, experiments have found that blue light can reduce the inhibition of red light on the photosynthetic system activity and photosynthetic electron transport capacity of cucumber leaves. Therefore, blue light is an important factor affecting the photosynthetic system activity and photosynthetic electron transport capacity. There are obvious species differences in the blue light needs of plants. After harvesting strawberries, it was found that 470nm in blue light of different wavelengths had obvious effects on the content of anthocyanins and total phenols. Green light Green light has always been a controversial light quality. Some scholars believe that it will inhibit plant growth, cause short plants and reduce vegetable yields. However, there are also many reports on the positive effects of green light on vegetables. A low percentage of green light can promote the growth of lettuce; supplementing the red and blue light with 24% green light can promote the growth of lettuce. Yellow light Yellow light basically inhibits plant growth, and because many researchers incorporate yellow light into green light, there is very little literature on the effect of yellow light on plant growth. Ultraviolet light Ultraviolet light generally shows more damage to organisms, reducing plant leaf area, inhibiting hypocotyl elongation, reducing photosynthesis and productivity, and making plants more susceptible to infection. However, proper supplementation of ultraviolet light can promote the synthesis of anthocyanins and flavonoids. By adding a small amount of UV-B to the cabbage to promote the synthesis of its polyphenols; postharvest UV-c treatment can slow down the dissolution of pectin in red pepper, The quality loss and softening process can significantly reduce the spoilage rate of the red pepper, extend the shelf life, and promote the accumulation of phenols on the surface of the red pepper. In addition, ultraviolet light and blue light affect the elongation and asymmetric growth of plant cells, thereby affecting the directional growth of plants. UV-B radiation causes dwarf plant phenotypes, small and thick leaves, short petioles, increased axillary branches, and changes in the root/shoot ratio. Far red light Far-red light is generally used in proportion to red light. Due to the structure of the photosensitive pigment that absorbs red light and far-red light, the effects of red light and far-red light on plants can be mutually converted and mutually offset. When the white fluorescent lamp is the main light source in the growth room, LEDs are used to supplement far-red radiation (emission peak 734nm), the content of anthocyanin, carotenoid and chlorophyll is reduced, while the fresh weight, dry weight, stem length, leaf length and leaf width of the plant increase . The effect of supplementing FR on growth may be due to the increase in light absorption caused by the increase in leaf area. Arabidopsis thaliana treated with low R/FR has larger and thicker leaves, increased biomass, and accumulation of more soluble metabolites than treated with high R/FR, which improves cold resistance. Remote grow light led www.agoodlamp.wom

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