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| Research advance on the functions of rice organs in cadmium inhibition: A review |
| Received:February 28, 2019 |
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| KeyWord:rice;cadmium;vegetative organs;inhibition mechanism;distribution characteristics |
| Author Name | Affiliation | | LIU Zhong-qi | Key Laboratory of Original Agro-Environmental Pollution Prevention and Control, Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China | | ZHANG Chang-bo | Key Laboratory of Original Agro-Environmental Pollution Prevention and Control, Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China | | HUANG Yong-chun | Key Laboratory of Original Agro-Environmental Pollution Prevention and Control, Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China |
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| Abstract: |
| Cadmium (Cd) contamination in farmlands is an important factor causing rice cadmium pollution, but there is not a simple linear relationship between them. During the long process of natural evolution, rice organs including root, leaf, spike, glume, pericarp, seed coat and others have evolved the special function to discriminate essential elements from harmful ones. A large amount of cadmium is fixed in the cell walls of vegetative organs or compartmentalized in vacuoles. After many interceptions from miscellaneous cells, only a small amount of cadmium flows into the spike rachises. Cadmium concentration in rachises is positively and linearly correlated with cadmium content in rice grains. After grain filling and maturation, cadmium is mainly distributed in glume, aleurone layer and embryo with high protein. Starch has the lowest content of cadmium in grains. Rice roots and nodes have much higher cadmium concentration than other organs. There is a great potential in reducing the risk of cadmium pollution in rice grains by exploring the interception and filtration function of vegetative organs to cadmium through cultivation measures and genetic manipulation. |
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