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Effect of Exogenous Silicon and Salicylic Acid on the Growth and Physiological Characteristics of Tobacco Seedlings Under Cadmium Stress
- ZHANG Xiao1, ZHANG Huanwei1, CHEN Biao1, WANG Kaiyue1, ZHOU Zifang2, SHAO Huifang1, XU Zicheng1, HUANG Wuxing1*
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2019, 21(3):
133-140.
DOI: 10.13304/j.nykjdb.2018.0283
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In order to explore the synergistic effect of exogenous silicon and salicylic acid on alleviating cadmium toxicity in tobacco seedlings, this paper took tobacco variety NC89 as experimental material and studied the effect of single exogenous silicon, salicylic acid treatment and their compound treatment by hydroponics on biomass, cadmium accumulation, antioxidant enzyme activity, chlorophy Ⅱ content and photosynthetic characteristics of tobacco seedlings under 100 μmol/L cadmium stress. The results showed that single exogenous silicon, salicylic acid treatment and their combined treatment could promote tobacco seedling growth, reduce cadmium accumulation and improve photosynthetic characteristics. Among them, the effect of combined treatment was the best, because the biomass of root, stem and leaf, Pn, Tr and WUE of leaf were significantly increased than those from cadmium stress treatment by 186.01%, 122.08%, 125.02%, 326.39%, 200% and 527.88%, respectively. While, the cadmium accumulation of root, stem and leaf, and intercellular CO2 concentration (Ci) were significantly reduced by 90.01%, 87.25%, 90.91% and 59.85%, respectively. Although compound treatment was effective in enhancing antioxidant capacity and chlorophyⅡ content of tobacco seedlings, single salicylic acid treatment had the best effect. Under single salicylic acid treatment, the content of MDA, activity of SOD, POD and CAT activities were decreased significantly by 41.21%, 31.36%, 32.37% and 22.55% than those under cadmium stress treatment. In addition, the contents of chlorophy Ⅱ a, chlorophy Ⅱ b and carotenoids increased significantly by 80.08%, 132.53% and 165.73%, respectively. In general, the combined use of exogenous silicon and salicylic acid could effectively relieve cadmium toxicity, reduce cadmium accumulation, increase biomass and improve photosynthetic capacity.