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| Genotypic variation of arsenic and cadmium uptake by upland rice |
| Received:March 14, 2016 |
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| KeyWord:upland rice;arsenic;cadmium;genotype;screening |
| Author Name | Affiliation | E-mail | | TAN Yu-rong | College of Agriculture, Resources and Environmental Sciences, Tianjin Agricultural University, Tianjin 300384, China
Agro-Environmental Protection Institute, Ministry of Agriculture, Tianjin 300191, China | | | XU Xiao-yan | College of Agriculture, Resources and Environmental Sciences, Tianjin Agricultural University, Tianjin 300384, China | | | DING Yong-zhen | Agro-Environmental Protection Institute, Ministry of Agriculture, Tianjin 300191, China | dingyongzhen@caas.cn | | ZHENG Xiang-qun | Agro-Environmental Protection Institute, Ministry of Agriculture, Tianjin 300191, China | | | DAI Li-hong | Agro-Environmental Protection Institute, Ministry of Agriculture, Tianjin 300191, China | | | FENG Ren-wei | Agro-Environmental Protection Institute, Ministry of Agriculture, Tianjin 300191, China | | | SHI Rong-guang | Agro-Environmental Protection Institute, Ministry of Agriculture, Tianjin 300191, China | | | ZHOU Li | Agro-Environmental Protection Institute, Ministry of Agriculture, Tianjin 300191, China | | | CHEN Pei-zhen | Agro-Environmental Protection Institute, Ministry of Agriculture, Tianjin 300191, China | | | YANG Bo | Agro-Environmental Protection Institute, Ministry of Agriculture, Tianjin 300191, China | |
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| Abstract: |
| Arsenic(As) and cadmium(Cd) pollution is one of the major environmental problems in rice plantation in China. In this study, pot experiments were used to study As and Cd absorption and translocation in 29 different genotypic upland rice cultivars. The results showed that there are remarkable difference in the biomass and As and Cd uptake among upland rice cultivars. The average biomass per plant and the variation coefficients were 23.57 g and 15.8%, respectively. In shoot, husk and grain(brown rice), As element concentration were 1.022, 0.177 mg·kg-1 and 0.050 mg·kg-1 and the variation coefficients were 25.1%, 54.3% and 39.7%, respectively; Cd element concentration were 0.811, 0.230 mg·kg-1 and 0.116 mg·kg-1 and the variation coefficients were 58.2%, 38.9% and 58.0%, respectively. The concentration of As and Cd in plant tissues showed characterisitics as follows:grain < husk < straw, and the Cd and As element content ratios in this three tissues were 1:1.9:6.7 and 1:3.5:20.4, respectively. The correlation coefficients of Cd concentration among different tissues were higher than that of As. Correlation analysis showed that, the correlation coefficients of Cd between straw and husk, straw and grain, husk and grain were 0.466(P<0.05), 0.658(P<0.01) and 0.758(P<0.01),and that of As were 0.437(P<0.05), 0.290 and 0.611(P<0.01), respectively. The migration capability of Cd among different tissues were stronger than that of As, and the genotypes differences with capability to absorb and transport Cd were bigger than As. As element contents in the grain of all cultivars were less than the standard for food security(NY 5115-2002, 0.5 mg·kg-1), and 82.8% of all cultivars contained the Cd contents in the grain less than the standards(GB 2762-2012, 0.2 mg·kg-1) and 37.9% of all cultivars contained both Cd and As contents in the grain less than half of the standards, including V2, V3, V6, V11, V12, V13, V15, V16, V19, V20 and V25. This study showed that screening Cd lower absorption of upland rice varieties grown under non-flooded cultivation can guarantee safety production in China. |
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