About the Authors
Department of Plant-Microbe Interactions, Max-Planck Institute for Plant Breeding Research, Cologne, Germany
The authors have declared that no competing interests exist.
Conceived and designed the experiments: AVG SBB JEP. Performed the experiments: AVG SBB EG. Analyzed the data: AVG SBB RPH JEP. Contributed reagents/materials/analysis tools: AVG MW GL SR. Wrote the paper: AVG SBB JEP.