1. School of Biological and Agricultural Science; Shanghai Jiao Tong Univ.; Shanghai 200240 China
2. National Engineering Lab. for Tree Breeding; Key Lab. of Genetics and Breeding in Forest Trees and Ornamental Plants, Ministry of Education, The Tree and Ornamental Plant Breeding and Biotechnology Lab. of State Forestry Administration; Beijing Forestry Univ.; Beijing 100083 China
3. Dep. of Plant Biology and Pathology, Rutgers; State Univ. of New Jersey; New Brunswick NJ 08901