Fig. S1 The occurrence of peptides within the pectin methylesterase (PME) domain in seven independent peptide mass fingerprinting (PMF) experiments and identification of AT3G14310 by matrix-assisted laser desorption/ionization-time of flight (MALDI-TOF) mass spectrometry (MS) in different protein fractions.

Fig. S2 Immunolocalization of the Arabidopsis thaliana pectin methylesterase 3 (AtPME3) protein using the LuPME3 pre-immune serum.

Fig. S3AUXIN RESPONSE FACTOR 6 (ARF6), ARF8 and ARF17 expression analyzed by RT-qPCR in dark-grown hypocotyls of the Arabidopsis thaliana pectin methylesterase 3-1 (atpme3-1) mutant (ARF17-OX, arf8, arf6 and mir160c-OX).

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