[1] Scottish Crop Res Inst, Plant Pathol Programme, Dundee DD2 5DA, Scotland
[2] Max Planck Inst Plant Breeding Res, D-50829 Cologne, Germany
[3] Univ Edinburgh, Sch Biol Sci, Inst Mol Plant Sci, Edinburgh EH9 3JR, Midlothian, Scotland
[4] John Innes Ctr, Sainsbury Lab, Norwich NR5 7UH, Norfolk, England
[5] Ctr Genet Engn & Biotechnol, Havana 10600, Cuba