1. New Use Agriculture and Natural Plant Products Program, Department of Plant Biology and Pathology, Cook College, Rutgers University, New Brunswick, New Jersey 08901, Department of Medicinal Chemistry, Ernest Mario School of Pharmacy, Rutgers University, Piscataway, New Jersey 08854, Department of Botany, The University of Hong Kong, Pokfulam Road, Hong Kong, and Key Laboratory, Institute of Plant Pathology, Yunnan Agricultural University, Kunming 650201, People's Republic of China