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JXB Advance Access published online on May 24, 2007
Journal of Experimental Botany, doi:10.1093/jxb/erm101
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© The Author [2007]. Published by Oxford University Press [on behalf of the Society for Experimental Biology]. All rights reserved. For Permissions, please e-mail: journals.permissions@oxfordjournals.org

RESEARCH PAPER

Localization of myo-inositol phosphate synthase (GmMIPS-1) during the early stages of soybean seed development

JM Chiera * and EA Grabau{dagger}

Department of Plant Pathology, Physiology, and Weed Science, Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061, USA

{dagger} To whom correspondence should be addressed. E-mail: egrabau{at}vt.edu

As a precursor to a large variety of compounds, myo-inositol is a central molecule required for cell metabolism and plant growth. The de novo synthesis of myo-inositol requires the activity of the enzyme D-myo-inositol-3-phosphate synthase (MIPS). MIPS cDNAs encoding one or more isoforms have been cloned from a number of species, nevertheless, little is known about the regulation of MIPS expression in developing seed. Seed-specific expression of a soybean isoform (GmMIPS-1) has been demonstrated, but tissue-specific localization during embryo development has not been reported. Using immunolocalization techniques, a specialized area of GmMIPS-1 expression was identified in the outer integumentary layer during early soybean seed development. In addition, localization data provided evidence that MIPS was associated with oxalate crystal idioblasts.

Key words: Calcium oxalate, development, Glycine max, crystal idioblasts, MIPS, myo-inositol, myo-inositol phosphate synthase, soybean seed

* Present address: Department of Horticulture and Crop Science, Ohio Agricultural Research and Development Center, Ohio State University, Wooster, Ohio 44691, USA.

Received 2 March 2007; Revised 6 April 2007 Accepted 17 April 2007


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