| Dynamic changes in the distribution of minerals in relation to phytic-acid accumulation during rice seed development. | |
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MedLine Citation:
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PMID: 23090587 Owner: NLM Status: Publisher |
Abstract/OtherAbstract:
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Phytic acid (inositol hexakisphohphate: InsP6) 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 (µ-XRF) imaging analysis to characterize the simultaneous subcellular distribution of some mineral elements (P, Ca, K, Fe, Zn, and Cu) in immature and mature rice (Oryza sativa L.) seeds. This fine-imaging method can reveal whether these elements co-localize. We also determined their accumulation patterns and the changes in phosphate (Pi) and InsP6 contents during seed development. While the InsP6 content in the outer parts of seeds rapidly increased during seed development, the Pi contents of both the outer and inner parts of seeds remained low. P, Ca, K, and Fe were most abundant in the aleurone layer, and they co-localized throughout seed development. Zn was broadly distributed from the aleurone layer to the inner endosperm. Cu localized outside the aleurone layer and did not co-localize with P. From these results, we suggest that P translocated from source organs was immediately converted to InsP6 and accumulated in aleurone-layer cells, and that Ca, K, and Fe accumulated as phytic acid salt (phytate) in the aleurone layer, whereas Zn bound loosely to InsP6, and accumulated not only in phytate but also in another storage form. Cu accumulated in the endosperm and may exhibit a storage form other than phytate. |
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Authors:
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Toru Iwai; Michiko Takahashi; Koshiro Oda; Yasuko Terada; Kaoru T Yoshida |
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Publication Detail:
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Type: JOURNAL ARTICLE Date: 2012-10-22 |
Journal Detail:
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Title: Plant physiology Volume: - ISSN: 1532-2548 ISO Abbreviation: Plant Physiol. Publication Date: 2012 Oct |
Date Detail:
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Created Date: 2012-10-23 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 0401224 Medline TA: Plant Physiol Country: - |
Other Details:
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Languages: ENG Pagination: - Citation Subset: - |
Affiliation:
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1 The University of Tokyo; |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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