According to researcher Liu Wenke from the Institute of Agricultural Environment and Sustainable Development of the Chinese Academy of Agricultural Sciences, closed soilless cultivation is prone to accumulate autotoxic substances, while TiO2 photocatalysis can degrade root exudates and rice husks in the nutrient solution of substrate cultivation. The product, sunlight only contains 3% of ultraviolet light, and facility covering materials such as glass filter out more than 60%, which cannot be used in facilities; vegetables are cultivated off-season and low temperature in winter, which makes them inefficient and stable, which cannot meet the requirements of facility vegetable factories. The demand for chemical production.
Countries all over the world are actively studying the feasibility of using UVLED as a light source for tissue culture. In terms of the effect of monochromatic light on tissue cultured seedlings, studies have found that red light UV LED can promote the growth of orchid tissue cultured seedlings, but the chlorophyll content, stem and root dry weight are slightly lower than fluorescent lamps. By using UV LED to supplement monochromatic red light or far red light to change the light quality, and then control the length and growth of potato tissue culture seedling stems. Studies have shown that with red UV LED alone, excessive elongation of the stems of chrysanthemum tissue culture seedlings leads to fragile stems, and other important indicators are also reduced, which is generally not conducive to the normal growth and development of plants. The main reason is that the monochromatic red light leads to the unbalanced distribution of the available light energy in the system and inhibits the growth of the stems. The study found that the plant height and internode length of grape tissue culture seedlings of all genotypes under the treatment of pure red UV LED were significantly longer than those treated with fluorescent light, but the chlorophyll content and the number of leaf stomata were the highest in the treatment of monochromatic blue UV LED. , The red light UV LED is the lowest. This shows that plant height has a direct relationship with rooting ratio, and long-wavelength red light is necessary for the morphology of grape roots.
