1. Department of Botany, University of British Columbia, Vancouver, British Columbia V6T 1Z4, Canada
2. Institut National de la Recherche Agronomique (INRA), Nantes 44316, France
3. Department of Plant Biochemistry, Albrecht-von-Haller-Institute, University of Goettingen, Goettingen 37077, Germany
4. Department of Plant Biochemistry, Goettingen Center for Molecular Biosciences (GZMB), University of Goettingen, Goettingen 37077, Germany
5. Department of Wood Science, University of British Columbia, Vancouver, British Columbia V6T 1Z4, Canada