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A. We and T. B. Alonso, CEA, cadarache) for preparing samples in AFM experiments and J. Mutterer (IBMP, Strasbourg) for Image-J M macro design; P. Milani (ENS, Lyon) and A. Peaucelle (INRA, Versailles) for advices in mounting samples in AFM experiments

J. Montillet, D. Rumeau-(-cea,-cadarache-), S. Mari, C. Curie, C. Inra et al., Castanet-Tolosan) for fruitful discussions ; J. Vermeer (IPB, Zürich) for providing the clones containing the promoters for pSCR, pCo2, pPET and pCASP1 constructs) for the phr1;phl1 double mutant USA) for the almt1 KO ;mate KO double mutant carrying the pALMT1::MATE construct; P. Benfey (Duke Univ., USA) for the upb1-1 & 35S::YFP-UP1 lines; G. Desnos for rapeseed seeds; the Nottingham Arabidopsis Stock Centre for providing Arabidopsis KO mutants; the Groupe de Recherches Appliquées en Phytotechnologie (GRAP, cadarache) for plant care. Support for the microscopy equipments was provided by the Région Provence Alpes Côte d'Azur, the Conseil Général des Bouches du Rhône, the French Ministry of Research, the European Union (European Regional Development Fund), the HélioBiotec platform, the CEA and the CNRS; the qRT-PCR machine was funded by Héliobiotech, This work was funded by CEA (APTTOX021401, APTTOX021403), Agence Nationale de la Recherche) and Investissements d'avenir (DEMETERRES). C.Ba. was supported by Agence Nationale de la Recherche (ANR-12-ADAP-0019); T.Da. was supported by Aix-Marseille-Université, CEA (APTTOX021401) and Investissements d'avenir (DEMETERRES); C.M. was supported by Investissements d'avenir (DEMETERRES); E.L. and E.D. were supported by Agence Nationale de la Recherche (ANR-09-BLAN-0118); M.B. was supported by CEA (APTTOX021401); B.P. was supported by Agence Nationale de la Recherche (ANR Retour Post-doc EmPhos PDOC00301), EMBO Long-Term Fellowship and European Reintegration Grant under the 7th Framework Program of the European Commission, 2010.