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| Uptake, Transfer and Distribution of Lead in Tobacco |
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| KeyWord:lead; uptake; transfer; distribution; tobacco |
| Author Name | Affiliation | | YAN Yi-hua | College of Resource and Environmental Science, Sichuan Agricultural University, Chengdu 611130, China | | ZHENG Zi-cheng | College of Resource and Environmental Science, Sichuan Agricultural University, Chengdu 611130, China | | LI Ting-xuan | College of Resource and Environmental Science, Sichuan Agricultural University, Chengdu 611130, China | | ZHANG Xi-zhou | College of Resource and Environmental Science, Sichuan Agricultural University, Chengdu 611130, China | | WANG Yong | Liangshan Branch, Sichuan Tobacco Corporation, Xichang 615000, Sichuan, China |
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| Abstract: |
| Elevated lead（Pb） in tobacco profoundly impacts the quality of cigarettes. Uptake and transfer of Pb by tobacco are dependent on its growth. A pot experiment was performed to examine Pb uptake, transfer and distribution in tobacco grown in soils spiked with different Pb levels during the whole growth period. Lead additions obviously inhibited tobacco growth, especially at early stages. Tobacco roots had strong retention of Pb, which restricted transportation of Pb from roots to shoots. Concentrations of Pb in different organs ranged from 13.89 mg·kg-1 to 180.74 mg·kg-1,with an order of roots>stems>leaves, increasing with Pb additions during growth periods. As the growth progressed, concentrations of Pb in tobacco roots, stems and leaves showed a rising-and-falling trend from the rosette stage to squaring stage. The root Pb decreased from the squaring stage to mature stage. Transfer coefficients of Pb from roots to leaves and stems ranged from 0.35 to 1.00, and 0.25 to 0.91, respectively, both decreasing with growth stages and Pb additions. Lead accumulation was generally in order：leaves>roots>stems, whereas roots>leaves>stems at mature stage in T2 and T3 treatments. Peak and squaring stages were the critical periods for Pb transfer from tobacco roots to shoots. |
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