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| Effect of selenite on arsenic uptake, translocation, and oxidative stress in upland rice |
| Received:March 06, 2017 |
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| KeyWord:upland rice;arsenic;selenium;malondialdehyde content;antioxidant enzyme activity |
| Author Name | Affiliation | E-mail | | YIN Xing-xing | College of Land and Environment, Shenyang Agricultural University, Shenyang 110866, China
Agro-Environmental Protection Institute, Ministry of Agriculture, Tianjin 300191, China
Key Laboratory of Agro-Environmental Pollution Control and Prevention, Ministry of Agriculture, Tianjin 300191, China | dingyongzhen@caas.cn | | ZHENG Xiang-qun | Agro-Environmental Protection Institute, Ministry of Agriculture, Tianjin 300191, China
Key Laboratory of Agro-Environmental Pollution Control and Prevention, Ministry of Agriculture, Tianjin 300191, China | | | DING Yong-zhen | Agro-Environmental Protection Institute, Ministry of Agriculture, Tianjin 300191, China
Key Laboratory of Agro-Environmental Pollution Control and Prevention, Ministry of Agriculture, Tianjin 300191, China | | | FENG Ren-wei | Agro-Environmental Protection Institute, Ministry of Agriculture, Tianjin 300191, China
Key Laboratory of Agro-Environmental Pollution Control and Prevention, Ministry of Agriculture, Tianjin 300191, China | | | SHI Rong-guang | Agro-Environmental Protection Institute, Ministry of Agriculture, Tianjin 300191, China
Key Laboratory of Agro-Environmental Pollution Control and Prevention, Ministry of Agriculture, Tianjin 300191, China | | | CHENG Wei-min | Agro-Environmental Protection Institute, Ministry of Agriculture, Tianjin 300191, China
Key Laboratory of Agro-Environmental Pollution Control and Prevention, Ministry of Agriculture, Tianjin 300191, China | | | CHEN Pei-zhen | Agro-Environmental Protection Institute, Ministry of Agriculture, Tianjin 300191, China
Key Laboratory of Agro-Environmental Pollution Control and Prevention, Ministry of Agriculture, Tianjin 300191, China | |
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| Abstract: |
| Pot experiments were conducted to study the effects of different concentrations (0, 1.0, and 5.0 mg·kg-1) of selenium (Se) on growth, arsenic (As) uptake and transport, and physiological parameters of upland rice under stress induced by different concentrations (20.1, 65.2, and 83.9 mg·kg-1) of As. Low (V1) and high (V2) As-accumulating upland rice were selected as the experimental materials. V1 and V2 are different varities of the same species. The results showed that under low-concentration As stress, V1 biomass increased by 3.50% and 31.13%, compared with the control (CK), in soils with low and high Se concentration, respectively, whereas V2 biomass increased by 17.89% and 34.95%, respectively. Under medium-concentration As stress, V1 biomass rose by 56.42% and 122.96%, and V2 by 34.38% and 38.73% at high and low Se concentrations, respectively. Se increased the As content in the roots but reduced As accumulation in stalks and leaves, and distinctly reduced As transport coefficients from root to stem. Under conditions of no, slight, and medium As stress in soil containing a high concentration of Se, As increased in the roots of V1 by 55.69%, 27.08%, and 18.22%, respectively, whereas it decreased in the stems by 18.89%, 21.10%, and, 30.93%, and in the leaves by 19.63%, 27.68%, and 15.12%, respectively. Under the same conditions, As increased in the roots of V2 by 48.98%, 23.82%, and 12.71%, whereas it decreased in the stems by 17.02%, 24.58%, and 16.16%, and in the leaves by 17.61%, 20.52%, and 13.26%, respectively. The malondialdehyde (MDA) content in leaves rose under As stress, but Se treatment resulted in a significant reduction in the MDA content. Under low-concentration As stress in soils with low and high Se concentrations, the MDA content in V1 leaves decreased by 9.73% and 13.26%, respectively, whereas that in V2 leaves decreased by 16.09% and 20.68%. Similarly, under medium-concentration As stress, the MDA content in V1 leaves decreased by 9.29% and 19.01%, respectively, whereas that in V2 decreased by 14.80% and 19.79%. In V1, Se clearly enhanced the activity of antioxidant enzymes (SOD, POD, and CAT) in leaves under different levels of As stress, whereas in V2, Se enhanced and inhibited antioxidant enzyme activity under low- and medium-concentration As stress, respectively. This study shows that Se can effectively relieve As stress in upland rice. Owing to differences in the As uptake mechanism of the low (V1) and high (V2) As-accumulating species, As uptake and transport in V2 are considerably more efficient than those in V1, and the MDA concentrations and POD and CAT activities of V2 are considerably higher than those in V1. |
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