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| Eco-toxicity and Accumulation of Inorganic Trivalent Arsenic in Lettuce |
| Received:December 13, 2014 |
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| KeyWord:inorganic trivalent arsenic;lettuce;eco-toxicity;accumulation |
| Author Name | Affiliation | E-mail | | LAI Chang-hong | Key Laboratory of Agro-Environment in the Tropics, Ministry of Agriculture, P.R. China, South China Agricultural University, Guangzhou 510642, China | | | LIU Ya-ling | Key Laboratory of Agro-Environment in the Tropics, Ministry of Agriculture, P.R. China, South China Agricultural University, Guangzhou 510642, China | | | HE Hong-zhi | Key Laboratory of Agro-Environment in the Tropics, Ministry of Agriculture, P.R. China, South China Agricultural University, Guangzhou 510642, China | | | LI Hua-shou | Key Laboratory of Agro-Environment in the Tropics, Ministry of Agriculture, P.R. China, South China Agricultural University, Guangzhou 510642, China | | | CHEN Gui-kui | Key Laboratory of Agro-Environment in the Tropics, Ministry of Agriculture, P.R. China, South China Agricultural University, Guangzhou 510642, China | guikuichen@scau.edu.cn |
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| Abstract: |
| Seed germination test and pot experiment were conducted to investigate the eco-toxicity and accumulation of inorganic trivalent arsenic in lettuce. The seed germination, plant growth, physiological characteristics and arsenic accumulation in lettuce were examined. The germination rates and germination potential of lettuce seeds decreased as As(Ⅲ) concentrations increased. At As(Ⅲ) concentrations greater than 1.00 mg·L-1, the seed germination was inhibited significantly, with over 6.67% reduction. In the pot experiment, plant height and biomass of lettuce were lower than those in the control when As(Ⅲ) was added to soil at more than 50.00 mg·kg-1. When As(Ⅲ) concentration was 200.00 mg·kg-1, the plant height was only 86.07% of the control, and the dry weights of the aboveground and underground parts were only 72.39% and 72.73% of the control, respectively. The chlorophyll content, leaf fluorescence parameters and antioxidant enzyme activities increased at low arsenic concentrations and then decreased at higher concentrations. High levels of soil arsenic could lead to a significant rise of malondialdehyde content in lettuce leaves. Arsenic concentrations in both aboveground and belowground parts of lettuce increased significantly with increasing soil arsenic, which were respectively 0.39~2.15 mg·kg-1 and 1.18~2.56 mg·kg-1. When arsenic concentrations in soil were higher than 14.98 mg·kg-1, the arsenic concentrations detected in the edible part of lettuce would be beyond the food health standard value of 0.5 mg·kg-1. |
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