[1] Univ Florida, Dept Hort Sci, Gainesville, FL 32606 USA
[2] Nanjing Forestry Univ, Coll Forest Resources & Environm, Key Lab Forest Genet & Gene Engn, Nanjing 210037, JS, Peoples R China
[3] Penn State Univ, Dept Publ Hlth Sci, Hershey, PA 17033 USA
[4] W Virginia Univ, Dept Stat, Morgantown, WV 26506 USA
[5] Beijing Forestry Univ, Coll Life Sci & Biotechnol, State Key Lab Tree Breeding, Beijing 100083, Peoples R China
[6] Penn State Univ, Dept Stat, University Pk, PA 16802 USA