1. Horticultural Sciences Department, University of Florida, Gainesville, Florida 32611-0690
2. Botany Department, Washington State University, Pullman, Washington 99164-4238
3. Pioneer Hi-Bred International, 7300 N.W. 62nd Avenue, Johnston, Iowa 50131-1004
4. Institut für Forstbotanik und Baumphysiologie, Albert-Ludwigs-Universität, D-79085 Freiburg, Germany
5. Frontier Research Program, Institute of Physical and Chemical Research (RIKEN), 2-1 Hirosawa, Wako-shi, Saitama 351-0198, Japan
6. Biochemistry Department, Michigan State University, East Lansing, Michigan 48824-1319