Pedosphere 31(1): 3--10, 2021
ISSN 1002-0160/CN 32-1315/P
©2021 Soil Science Society of China
Published by Elsevier B.V. and Science Press
Transport of cadmium from soil to grain in cereal crops: A review
Jian Feng MA1, Ren Fang SHEN2, Ji Feng SHAO3
1Institute of Plant Science and Resources, Okayama University, Chuo 2-20-1, Kurashiki 710-0046(Japan)
2State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008(China)
3State Key Laboratory of Subtropical Silviculture, Zhejiang A&F University, Lin'An 311300(China)
Corresponding Author:Jian Feng MA
      Due to rapid urbanization and industrialization, many soils for crop production are contaminated by cadmium (Cd), a heavy metal highly toxic to many organisms. Cereal crops such as rice, wheat, maize, and barley are the primary dietary source of Cd for humans, and reducing Cd transfer from soil to their grains is therefore an important issue for food safety. During the last decade, great progress has been made in elucidating the molecular mechanisms of Cd transport, particularly in rice. Inter- and intraspecific variations in Cd accumulation have been observed in cereal crops. Transporters for Cd have been identified in rice and other cereal crops using genotypic differences in Cd accumulation and mutant approaches. These transporters belong to different transporter families and are involved in the uptake, vacuolar sequestration, root-to-shoot translocation, and distribution of Cd. Attempts have been made to reduce Cd accumulation in grains by manipulating these transporters through overexpression or knockout of the transporter genes, as well as through marker-assisted selection breeding based on genotypic differences in Cd accumulation in the grains. In this review, we describe recent progress on molecular mechanisms of Cd accumulation in cereal crops and compare different molecular strategies for minimizing Cd accumulation in grains.
Key Words:  barley,gene knockout,gene overexpression,genotypic difference,maize,rice,transporter,wheat
Citation: Ma J F, Shen R F, Shao J F. 2021. Transport of cadmium from soil to grain in cereal crops: A review. Pedosphere. 31(1): 3-10.
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