1. Laboratory for Fruit Breeding and Biotechnology, Division of Crop Biotechnics, Katholieke Universiteit Leuven, De Croylaan 42, 3001 Leuven, Belgium, Laboratory of Agromachinery and Processing, Division of Mechatronics, Biostatistics and Sensors, Katholieke Universiteit Leuven, Kasteelpark Arenberg 30, 3001 Leuven, Belgium, and Laboratory for Tropical Crop Improvement, Division of Crop Biotechnics, Katholieke Universiteit Leuven, Kasteelpark, Arenberg 18, 3001 Leuven, Belgium