| 摘 要： | The Hardwood Tree Improvement and Regeneration Center （HTIRC）, led by Dr. Charles H. Michler, is a collaborative effort between Purdue University, USDA Forest Service, State of Indiana, and the hardwood forest industry. Additional funding partners are the Van Eck Forest Foundation, National Science Foundation, ArborAmerica Inc., Steelcase Inc., Indiana Hardwood Lumbermen＇s Association, National Hardwood Lumber Association, Indiana Forestry and Woodland Owners Association and Walnut Council. The Center employees eight Ph.D. principal investigators who specialist in genetics and tree improvement, tree physiology, silviculture, entomology, nursery management and plantation establishment, and outreach. HTIRC＇s research and development is focused on fine hardwood species （Juglans, Quercus, Castanea, Prunus and Fraxinus） native to the central hardwoods region of the USA and the Center is providing graduate education to more than 22 MS and Ph.D. students Recent accomplishments include development of： 1） seed zones and genetic transformation protocols for Juglans nigra, 2） vegetative propagation methods for Prunus serotina, and 3） cold hardiness and advance mineral nutrition guidelines for hardwood nursery stock
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