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currently the focus of forthcoming research. 
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6. ACKNOWLEDGEMENTS 
This research forms part of a Research Training Project 
financed by the European Community with Contract no: EVK2- 
CT-2001-50014. The authors are also grateful to Dr Vicente 
Pons, Departamento de Biología Vegetal, Universitat de 
Valencia, for providing the Xaló soil samples data. 
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