作者单位:Purdue Univ, Dept Hort & Landscape Architecture, W Lafayette, IN 47907 USA[1]Hunan Agr Univ, Crop Gene Engn Key Lab Human Province, Changsha 410128, Peoples R China[2]Rockefeller Univ, Howard Hughes Med Inst, Lab Mol Neurobiol & Biophys, New York, NY 10021 USA[3]