Reviews and Special Topics

Mechanism of Zn Uptake, Translocation  in Rice Plant and  Znenrichment  in Rice Grain

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  • 1 Zhejiang Normal University, Jinhua 321004, China; 2 College of Environmental and  Resource Sciences, Zhejiang University, Hangzhou  310029, China;

Received date: 2011-05-08

  Revised date: 2011-08-28

  Online published: 2012-05-10

Abstract

Zinc (Zn) is an essential but easy to be deficient micronutrient for human beings around the world. Zinc biofortification through staple food crops is suggested as an effective way to solve this problem. Unveiling the mechanism of Zn uptake, translocation and accumulation in edible parts is regarded as a critical step. Zinc uptake by rice roots  largely depends on: 1) excretions (such as mugineic acid)   activating  the Zn ion, and 2) the heavy metal transporter uptaking the Zn2+ into root symplasm, among which the ZIP gene families are reported to be very important. Zinc transport in xylem are mainly in the forms of ions, but also reported to be associated with organic acid, nicotinamide and other ligands. Retranslocation of Zn by phloem  takes a vital role in  the Zn  accumulation in rice grains. Preferential localization of Zn in aleurone and/or association of Zn with phytic acid significantly reduce the Zn bioavailability in rice. Unveiling the mechanism of Zn accumulated in grains and improving the Zn density in rice grains through modern biotechnology may convert the problem of Zn deficiency for human beings. This review summarized the latest progresses  in researches on physiological function of Zn in rice, Zn uptake, translocation, remobilization, Zn distribution and in vivo speciation in rice, as well as Zn biofortification in food crops.

Cite this article

YU Yinjiang1, LIAO Haibing1, CHEN Wenrong1,*, TIAN Shengke2, YANG Xiaoe2 . Mechanism of Zn Uptake, Translocation  in Rice Plant and  Znenrichment  in Rice Grain[J]. Chinese Journal OF Rice Science, 2012 , 26(3) : 365 -372 . DOI: 10.3969/j.issn.10017216.2012.03.017

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