1. Department of Agricultural, Food and Environmental Sciences University of Perugia Perugia Italy
2. CIHEAM Bari—Mediterranean Agronomic Institute of Bari Valenzano (BA) Italy
3. Department of Agricultural, Food and Forest Sciences University of Palermo Palermo Italy
4. INRAE Sophia Antipolis Cedex France
5. INRIA, Projet Hephaistos Sophia Antipolis Cedex France