Document Detail

Phloem transport of arsenic species from flag leaf to grain during grain filling.
MedLine Citation:
PMID:  21658183     Owner:  NLM     Status:  MEDLINE    
• Strategies to reduce arsenic (As) in rice grain, below concentrations that represent a serious human health concern, require that the mechanisms of As accumulation within grain be established. Therefore, retranslocation of As species from flag leaves into filling rice grain was investigated. • Arsenic species were delivered through cut flag leaves during grain fill. Spatial unloading within grains was investigated using synchrotron X-ray fluorescence (SXRF) microtomography. Additionally, the effect of germanic acid (a silicic acid analog) on grain As accumulation in arsenite-treated panicles was examined. • Dimethylarsinic acid (DMA) and monomethylarsonic acid (MMA) were extremely efficiently retranslocated from flag leaves to rice grain; arsenate was poorly retranslocated, and was rapidly reduced to arsenite within flag leaves; arsenite displayed no retranslocation. Within grains, DMA rapidly dispersed while MMA and inorganic As remained close to the entry point. Germanic acid addition did not affect grain As in arsenite-treated panicles. Three-dimensional SXRF microtomography gave further information on arsenite localization in the ovular vascular trace (OVT) of rice grains. • These results demonstrate that inorganic As is poorly remobilized, while organic species are readily remobilized, from leaves to grain. Stem translocation of inorganic As may not rely solely on silicic acid transporters.
Anne-Marie Carey; Gareth J Norton; Claire Deacon; Kirk G Scheckel; Enzo Lombi; Tracy Punshon; Mary Lou Guerinot; Antonio Lanzirotti; Matt Newville; Yongseong Choi; Adam H Price; Andrew A Meharg
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Publication Detail:
Type:  Journal Article; Research Support, N.I.H., Extramural; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, Non-P.H.S.     Date:  2011-06-10
Journal Detail:
Title:  The New phytologist     Volume:  192     ISSN:  1469-8137     ISO Abbreviation:  New Phytol.     Publication Date:  2011 Oct 
Date Detail:
Created Date:  2011-09-02     Completed Date:  2011-12-30     Revised Date:  2014-03-19    
Medline Journal Info:
Nlm Unique ID:  9882884     Medline TA:  New Phytol     Country:  England    
Other Details:
Languages:  eng     Pagination:  87-98     Citation Subset:  IM    
Copyright Information:
© 2011 The Authors. New Phytologist © 2011 New Phytologist Trust.
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MeSH Terms
Arsenic / metabolism*
Biological Transport
Germanium / metabolism
Imaging, Three-Dimensional
Oryza sativa / metabolism*
Phloem / metabolism*
Plant Leaves / metabolism*
Seeds / metabolism*
X-Ray Absorption Spectroscopy
Xylem / metabolism
Grant Support
P20 ES018175/ES/NIEHS NIH HHS; P42 ES007373/ES/NIEHS NIH HHS; P42 ES007373-14/ES/NIEHS NIH HHS; //Biotechnology and Biological Sciences Research Council
Reg. No./Substance:
00072J7XWS/Germanium; N712M78A8G/Arsenic

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