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| Alleviation effect of exogenous silicon on tobacco growth under lead and cadmium stress |
| Received:April 15, 2024 |
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| KeyWord:tobacco;exogenous silicon fertilizer;lead and cadmium stress;tobacco growth;lead enrichment and transfer;cadmium enrichment and transfer |
| Author Name | Affiliation | E-mail | | CUI Shifang | College of Landscape and Horticulture, Southwest Forestry University, Kunming 650224, China | | | LIU Jiao | College of Landscape and Horticulture, Southwest Forestry University, Kunming 650224, China | | | LUO Tingli | Yunnan Provincial Tobacco Company Lincang City Company Linxiang Branch, Lincang 677000, China | | | HUANG Xiaoxia | College of Landscape and Horticulture, Southwest Forestry University, Kunming 650224, China | huangxx@swfu.edu.cn |
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| Abstract: |
| In order to explore the effects of adding exogenous silicon fertilizer on the growth of tobacco under lead and cadmium stress and the enrichment and transfer characteristics of lead and cadmium in various organs of tobacco plants, and to provide a theoretical basis for silicon fertilizer to alleviate lead and cadmium stress in tobacco, in this study, a pot experiment was carried out with tobacco variety K326 as the material. The lead and cadmium stress group and the control group were set up, and three different exogenous silicon fertilizers were applied respectively. After 90 days of treatment, the growth indexes of tobacco plants, the content of osmotic adjustment substances in leaves, the activity of antioxidant enzymes and the enrichment and transfer characteristics of lead and cadmium in various organs were measured and analyzed. Results showed that application of silicon fertilizer could increase the plant height, leaf number, leaf length, leaf width, total leaf area and dry matter accumulation of tobacco plants under lead and cadmium stress, significantly reduce the MDA content in tobacco leaves under lead and cadmium stress, increase the activity of SOD, POD, APX and CAT enzymes, and increase the content of proline, soluble protein and soluble sugar. Among them, the effect of applying exogenous organic silicon fertilizer 2 was the best. The plant height, total leaf area and total biomass of tobacco plants increased by 72.59%, 59.36% and 44.34%, respectively. The activities of SOD, POD, CAT and APX increased by 20.3%, 112.95%, 149.81% and 125.88%, respectively. The contents of proline, soluble protein and soluble sugar increased by 245.26%, 112.51% and 214.29%, respectively. Under the stress of lead and cadmium, lead was mainly enriched in the roots of tobacco plants, and cadmium was mainly enriched in tobacco leaves. The application of exogenous silicon fertilizer could reduce the content of lead and cadmium in various parts of tobacco plants and the enrichment and transfer coefficient. The lead content and lead enrichment coefficient in the roots of tobacco plants with exogenous organic silicon fertilizer 2 decreased by 54.57% and 54.62%, respectively, and the lead transfer coefficient decreased by 7.78%. The cadmium content and cadmium enrichment coefficient of tobacco leaves decreased by 43.57% and 13.58%, respectively, and the cadmium transfer coefficient decreased by 19.77%. Therefore, exogenous silicon fertilizer can promote the growth of tobacco, reduce the absorption, accumulation and transfer of lead and cadmium in tobacco plants, reduce the toxicity of lead and cadmium stress on tobacco, and improve the tolerance of tobacco to heavy metals; among them, the effect of organic silicon fertilizer is better than that of inorganic silicon fertilizer, and the effect of exogenous organic silicon fertilizer 2 with higher effective silicon content is the best. |
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