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| Effects of returning wheat straw on available cadmium and subcellular distribution of cadmium in rice |
| Received:January 10, 2020 |
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| KeyWord:cadmium;subcellular distribution;wheat straw returning;rice;DGT |
| Author Name | Affiliation | | HUANG Jie-ying | Anhui Province Key Laboratory of Farmland Ecological Conservation and Pollution Prevention, School of Resources and Environment, Anhui Agricultural University, Hefei 230036, China | | WU Xiu-yuan | Anhui Province Key Laboratory of Farmland Ecological Conservation and Pollution Prevention, School of Resources and Environment, Anhui Agricultural University, Hefei 230036, China | | TONG Ying-ying | Anhui Province Key Laboratory of Farmland Ecological Conservation and Pollution Prevention, School of Resources and Environment, Anhui Agricultural University, Hefei 230036, China | | CAO Sen | Anhui Province Key Laboratory of Farmland Ecological Conservation and Pollution Prevention, School of Resources and Environment, Anhui Agricultural University, Hefei 230036, China | | GAO Yue | Anhui Province Key Laboratory of Farmland Ecological Conservation and Pollution Prevention, School of Resources and Environment, Anhui Agricultural University, Hefei 230036, China | | YANG Hui-yan | Anhui Province Key Laboratory of Farmland Ecological Conservation and Pollution Prevention, School of Resources and Environment, Anhui Agricultural University, Hefei 230036, China |
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| Abstract: |
| The effects of wheat straw returning treatments on distribution of cadmium subcellular in rice were studied by a pot experiment for providing a scientific basis of straw returning at Cd polluted area. The different straw returning treatments were 7 850 kg·hm-2(FDWS), 3 925 kg·hm-2(HDWS)of wheat straw and CK with no straw returning. The soil available Cd and the distribution characteristics of Cd in rice subcellular structures were studied. The results showed that wheat straw returning treatments decreased the Cd contents in the cell wall (F1), organelles(F2), and soluble matter(F3)of rice roots(by 11.0%~51.1% compared to the CK)at the seedling and tillering stages, while the Cd content was increased in the F1, F2, and F3 of rice stems(by 10.1%~35.5%)at the filling and mature stages. Meanwhile, the results showed that wheat straw returning significantly reduced the Cd content in the F1 and F2 of rice stems(by 31.3%~47.4%)at the filling and mature stages, and also reduced the Cd content in the F3 of rice stems (49.4%~51.1%)at the tillering and filling stages. When compared HDWS and FDWS with CK, both straw returning treatments remarkably decreased the total accumulation of Cd in shoots(P<0.05). Cell wall binding and vacuolar compartmentalization were very important Cd detoxification mechanisms in rice roots, and Cd transportation from roots to shoots was restricted by wheat straw returning, which also significantly lessened the Cd content of rice grains, thus reducing the food safety risks resulting from Cd. Based on the above results, the FDWS treatment is recommended to safely produce rice in Cd-polluted soils, and correlation analysis revealed that the diffusive gradients in thin-films(DGT)may be a better indicator than traditional chemical extractants at reflecting the bioavailability of Cd in soils. |
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