1. Laboratoire des Plantes ExtrêmophilesCentre de Biotechnologie de Borj Cedria, BP 901 Hammam Lif 2050 Tunisia
2. Institute of Agricultural Biology and Biotechnology (IBBA)National Research Council, Pisa Unit, Research Area of Pisa, Via Moruzzi 1 56124 Pisa Italy
3. Department of Life SciencesUniversity of Siena Via A. Moro 2 53100 Siena Italy