1. Department of Forest Molecular Genetics and Biotechnology, Forestry and Forest Products Research Institute (FFPRI), 1 Matsunosato, Tsukuba, Ibaraki 305-8687, Japan
2. Martin Luther University Halle-Wittenberg, AGRIPOLY: International Graduate School in Agricultural and Polymer Sciences, Betty-Heimann-Straße 3, D-06120 Halle, Germany