1. Chemical and Petroleum Engineering, University of Kansas, Lawrence, Kansas 66045, United States, Department of Biochemistry, Kansas State University, Manhattan, Kansas 66506, United States, Division of Plant Biotechnology, College of Agriculture and Life Science, Chonnam National University, Gwangju 500-757, Korea, and Center for Grain and Animal Health Research, Agricultural Research Service, U.S. Department of Agriculture, Manhattan, Kansas 66502, United States