A. thaliana plants were grown in long-day conditions (16 h-day-at 21°C / 8 h night at 18°C cycles, LED tubes Philips 1500 mm SO 20W 840 T8, photon flux density of 120 µmol/s/m 2 at the plant level). Seedlings were grown for 8 days in hydroponic cultures at 23°C with constant light in Murashige and Skoog MS231 medium (Duchefa).
The FMT insertion mutant SALK_056717 was from Columbia ecotype. The line expressing the epitope-tagged ribosomal protein, FLAG-RPL18 (AT3G05590), was from (Zanetti et al., 2005) .
FMT-GFP, GFP-FMT and MS2-GFP lines were obtained by floral dip with pAM557, pAM549 and pAM495 plasmids respectively (Table S6) {Clough, 1998 #958}.
Transient transformation of At and N. benthamiana was performed by infiltration of leaves with a suspension of Agrobacterium tumefaciens harboring different constructs. The constructs allowed the expression of different GFP or split-GFP constructs, the pSu9-RFP mitochondrial marker (Michaud et al., 2014) , the COXIV-GFP mitochondrial marker (Peeters et al., 2000) and the silencing suppressor P19 protein (Michaud et al., 2014) .
The FMT insertion mutant SALK_056717 was from Columbia ecotype. The line expressing the epitope-tagged ribosomal protein, FLAG-RPL18 (AT3G05590), was from (Zanetti et al., 2005) .
FMT-GFP, GFP-FMT and MS2-GFP lines were obtained by floral dip with pAM557, pAM549 and pAM495 plasmids respectively (Table S6) {Clough, 1998 #958}.
Transient transformation of At and N. benthamiana was performed by infiltration of leaves with a suspension of Agrobacterium tumefaciens harboring different constructs. The constructs allowed the expression of different GFP or split-GFP constructs, the pSu9-RFP mitochondrial marker (Michaud et al., 2014) , the COXIV-GFP mitochondrial marker (Peeters et al., 2000) and the silencing suppressor P19 protein (Michaud et al., 2014) .