Document Detail

Dynamic changes in the distribution of minerals in relation to phytic acid accumulation during rice seed development.
MedLine Citation:
PMID:  23090587     Owner:  NLM     Status:  MEDLINE    
Phytic acid (inositol hexakisphosphate [InsP(6)]) is the storage compound of phosphorus in seeds. As phytic acid binds strongly to metallic cations, it also acts as a storage compound of metals. To understand the mechanisms underlying metal accumulation and localization in relation to phytic acid storage, we applied synchrotron-based x-ray microfluorescence imaging analysis to characterize the simultaneous subcellular distribution of some mineral elements (phosphorus, calcium, potassium, iron, zinc, and copper) in immature and mature rice (Oryza sativa) seeds. This fine-imaging method can reveal whether these elements colocalize. We also determined their accumulation patterns and the changes in phosphate and InsP(6) contents during seed development. While the InsP(6) content in the outer parts of seeds rapidly increased during seed development, the phosphate contents of both the outer and inner parts of seeds remained low. Phosphorus, calcium, potassium, and iron were most abundant in the aleurone layer, and they colocalized throughout seed development. Zinc was broadly distributed from the aleurone layer to the inner endosperm. Copper localized outside the aleurone layer and did not colocalize with phosphorus. From these results, we suggest that phosphorus translocated from source organs was immediately converted to InsP(6) and accumulated in aleurone layer cells and that calcium, potassium, and iron accumulated as phytic acid salt (phytate) in the aleurone layer, whereas zinc bound loosely to InsP(6) and accumulated not only in phytate but also in another storage form. Copper accumulated in the endosperm and may exhibit a storage form other than phytate.
Toru Iwai; Michiko Takahashi; Koshiro Oda; Yasuko Terada; Kaoru T Yoshida
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2012-10-22
Journal Detail:
Title:  Plant physiology     Volume:  160     ISSN:  1532-2548     ISO Abbreviation:  Plant Physiol.     Publication Date:  2012 Dec 
Date Detail:
Created Date:  2012-12-11     Completed Date:  2013-05-16     Revised Date:  2013-12-04    
Medline Journal Info:
Nlm Unique ID:  0401224     Medline TA:  Plant Physiol     Country:  United States    
Other Details:
Languages:  eng     Pagination:  2007-14     Citation Subset:  IM    
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MeSH Terms
Gene Expression Regulation, Developmental
Gene Expression Regulation, Plant
Minerals / metabolism*
Oryza sativa / genetics,  growth & development*,  metabolism*
Phosphates / metabolism
Phytic Acid / metabolism*
Plant Proteins / genetics,  metabolism
Seeds / genetics,  growth & development*,  metabolism*
Reg. No./Substance:
0/Elements; 0/Minerals; 0/Phosphates; 0/Plant Proteins; 7IGF0S7R8I/Phytic Acid

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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