[1] Wageningen Univ, Mol Biol Lab, Dept Plant Sci, Wageningen, Netherlands
[2] Univ N Carolina, Carolina Ctr Genome Sci, Chapel Hill, NC USA
[3] Max Planck Inst Plant Breeding Res, Dept Plant Microbe Interact, Cologne, Germany
[4] Univ Cologne, D-5000 Cologne 41, Germany