Philipp Simon, Vegetable Crops Research Unit, US Department of Agriculture Agricultural Research Service, Madison, WI, USA and Department of Horticulture, University of Wisconsin-Madison, Madison, WI, USAMassimo Iorizzo, Plants for Human Health Institute, Department of Horticultural Science, North Carolina State University, Kannapolis, NC, USADariusz Grzebelus, Institute of Plant Biology and Biotechnology, Faculty of Biotechnology and Horticulture, University of Agriculture in Krakow, Krakow, PolandRafal Baranski, Institute of Plant Biology and Biotechnology, Faculty of Biotechnology and Horticulture, University of Agriculture in Krakow, Krakow, Poland