1. Viikki Plant Science Centre, Organismal and Evolutionary Biology Research Program, Faculty of Biological and Environmental Sciences, Helsinki University, Fi-00014 Helsinki, Finland
2. Viikki Plant Science Centre, Department of Agricultural Sciences, Helsinki University, Fi-00014 Helsinki, Finland
3. Kyushu Okinawa Agricultural Research Center, National Agriculture and Food Research Organization, Chikugo, 833-0041 Fukuoka, Japan
4. Umeå Plant Science Centre, Department of Forest Genetics and Plant Physiology, Swedish University of Agricultural Sciences, 90187 Umea, Sweden
5. Natural Resources Institute Finland (Luke), Production Systems, Plant Genetics, 00790 Helsinki, Finland
6. Umeå Plant Science Centre, Department of Plant Physiology, Umeå University, 90187 Umea, Sweden