1. University of BordeauxUMR 5805 EPOC Talence Cedex France
2. Bordeaux INPG&EEA 4592 Pessac France
3. Univ. Bordeaux MontaigneG&EEA 4592 Pessac France
4. Institute of Botany The Czech Academy of Sciences Třeboň Czech Republic
5. Plant Ecology Group University of Tübingen Tübingen Germany
6. Estación Experimental de Zonas ÁridasConsejo Superior de Investigaciones Científicas La Cañada Spain