JXB Advance Access originally published online on May 24, 2007
Journal of Experimental Botany 2007 58(8):2261-2268; doi:10.1093/jxb/erm101
RESEARCH PAPER |
Localization of myo-inositol phosphate synthase (GmMIPS-1) during the early stages of soybean seed development
Department of Plant Pathology, Physiology, and Weed Science, Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061, USA
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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