1. French Associates Institute for Agriculture and Biotechnology of Drylands; Jacob Blaustein Institutes for Desert Research; Ben-Gurion University of the Negev; Midreshet Ben-Gurion 84990 Israel
2. Institute of Molecular Genetics IGM-CNR; National Research Council; Via Abbiategrasso 207 I-21700 Pavia Italy
3. Department of Horticulture and Landscape Architecture; Purdue University; West Lafayette IN 47907 USA