Rice,one of the major food crops world-wide,has a crucial position in the health and devel-opment of society.However,Hg bioconcentrated through rice may cause hazards to consumers due to exposure to Hg from anthropogenic as well as natural sources,although the risk level depends on the chem-ical form of Hg in rice grains.To clarify the trans-formation and transport of Hg in rice-field systems,the processes and mechanisms of Hg uptake by rice,and the factors that affect uptake are considered criti-cal for the development of potential alleviation strate-gies.Therefore,this review first briefly introduced Hg species in rice soils;then,the pathways of Hg uptake by rice and the endogenous and environmental fac-tors affecting the uptake were deeply approached,to elucidate the mechanisms.Finally,the bioconcentra-tion and distribution patterns of Hg in various tissues of rice were summarized.This will provide an effec-tive reference for the development of reasonable and effective Hg pollution control strategies in the future.
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