Institution: | Departmento de Microbiologia, Estación Experimental del Zaidín (C.S.I.C.), Spain; Department of Cellular and Environmental Physiology, Scottish Crop Research Institute, Invergowrie, Dundee DD2 5DA, UK; Department of Chemistry, Scottish Crop Research Institute, Invergowrie, Dundee DD2 5DA, UK; To whom correspondence should be addressed. E-mail: |