About the Authors
Laboratoire des Interactions Plantes-Microorganismes (CNRS-INRA), Chemin de Borde Rouge, Castanet Tolosan Cedex, France
The authors have declared that no competing interests exist.
MV, SG, and CB conceived and designed the experiments. MV and SG performed the experiments. MV and SG analyzed the data. MV, SG, and CB wrote the paper.