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| Bioaccumulation of Cd in different varieties of tobacco and their rhizosphere organic acid secretion characteristics |
| Received:February 01, 2018 |
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| KeyWord:soil pollution;Cd accumulation;tobacco;organic acids |
| Author Name | Affiliation | E-mail | | YU Hao | College of Forestry, Henan Agricultural University, Zhengzhou 450002, China | | | WANG You-jing | College of Life Sciences, Henan Agricultural University, Zhengzhou 450002, China | | | SONG Rui | College of Materials and Energy, South China Agricultural University, Guangzhou 510642, China | | | PAN Yan-shuo | College of Life Sciences, Henan Agricultural University, Zhengzhou 450002, China | | | WANG Chang-qing | Modern Experimental Technology Center, Henan Agricultural University, Zhengzhou 450002, China | | | LIU Bing-shan | Modern Experimental Technology Center, Henan Agricultural University, Zhengzhou 450002, China | | | LI Ben-yin | Institute of Plant Nutrient and Environmental Resources, Henan Academy of Agricultural Sciences, Zhengzhou, 450002, China | | | LI Xuan-zhen | College of Forestry, Henan Agricultural University, Zhengzhou 450002, China | xzli2015@sina.com |
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| Abstract: |
| In order to determine the feasibility of remediation of Cd-contaminated soil by tobacco, pot experiments were conducted in this study. Seven common tobacco varieties (Yunyan 87, Zhongyan 100, Yueyan 96, Changbohuang, K326, 8326, and NC628) were employed, and the ability of tobacco to bioaccumulate Cd and the secretion characteristics of organic acids in the rhizosphere were analyzed. The results showed that the biomasses of "Changbohuang" root, stem, and leaf were the highest under Cd stress. The Cd concentrations in "Yunyan 87" leaves, "Changbohuang" stems, and "8326" roots were the highest, reaching 64.67 mg·kg-1, 27.1 mg·kg-1, and 23.75 mg·kg-1, respectively. Regarding the Cd concentration in different organs, it was highest in leaves, followed by stems and roots. The highest removal rate of Cd, i.e., 3.48%, was observed in"Changbohuang". The organic acids in rhizosphere soils were analyzed using HPLC, and the results showed that oxalic acid was secreted by all the tobacco varieties. This study indicated that tobacco is potential for using in the remediation of heavy-metal-polluted soil, with "Changbohuang" the most promising variety for such. |
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