1 Department of Plant Science and Landscape Architecture, University of Maryland, College Park, MD 20742, USA.
2 Department of Plant Science and Landscape Architecture, University of Maryland, College Park, MD 20742, USA; Seeds Research, Syngenta Crop Protection, LLC, 9 Davis Dr, Research Triangle Park, NC 27709, USA.
3 Syngenta Biotechnology China, Ltd., 25 Life Science Park Rd., Zhongguancun Life Science Park, Beijing 102206, China.
4 Seeds Research, Syngenta Crop Protection, LLC, 9 Davis Dr, Research Triangle Park, NC 27709, USA.
5 Department of Plant Science and Landscape Architecture, University of Maryland, College Park, MD 20742, USA; Institute for Bioscience and Biotechnology Research, University of Maryland, Rockville, MD 20850, USA. Electronic address: yiping@umd.edu.