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Plant and Cell Physiology Advance Access originally published online on September 29, 2009
Plant and Cell Physiology 2009 50(11):1982-1987; doi:10.1093/pcp/pcp131
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© The Author 2009. Published by Oxford University Press on behalf of Japanese Society of Plant Physiologists. All rights reserved. For permissions, please email: journals.permissions@oxfordjournals.org

Short Communication

The Poplar GT8E and GT8F Glycosyltransferases are Functional Orthologs of Arabidopsis PARVUS Involved in Glucuronoxylan Biosynthesis

Chanhui Lee1, Quincy Teng2, Wenlin Huang2, Ruiqin Zhong1 and Zheng-Hua Ye1,*

1Department of Plant Biology, University of Georgia, Athens, GA 30602, USA
2National Exposure Research Laboratory, US Environmental Protection Agency, Athens, GA 30605, USA

*Corresponding author: E-mail, zhye{at}plantbio.uga.edu; Fax, +1-706-542-1805.


  Abstract

The poplar GT8E and GT8F glycosyltransferases have previously been shown to be associated with wood formation, but their roles in the biosynthesis of wood components are not known. Here, we show that PoGT8E and PoGT8F are expressed in vessels and fibers during wood formation and their encoded proteins are predominantly located in the endoplasmic reticulum. We demonstrate that expression of PoGT8E and PoGT8F in the Arabidopsis parvus mutant rescues the defects in the content and structure of glucuronoxylan conferred by the parvus mutation. These findings suggest that PoGT8E and PoGT8F are involved in glucuronoxylan biosynthesis during wood formation in poplar.

Keywords: Glycosyltransferase • Poplar • Secondary wall biosynthesis • Wood formation • Xylan

Abbreviations: CaMV, cauliflower mosaic virus; CFP, cyan fluorescent protein; ER, endoplasmic reticulum; GX, glucuronoxylan; MALDI-TOF MS, matrix-assisted laser-desorption ionization time-of-flight mass spectrometry; NMR, nuclear magnetic resonance; RT–PCR, reverse transcription–PCR; YFP, yellow fluorescent protein.

(Received August 18, 2009; Accepted September 24, 2009)
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