ABA signalling modulates the detection of the LM6 arabinan cell wall epitope at the surface of Arabidopsis thaliana seedling root apices.

• The hormonal and physiological regulations underpinning the cell contexts of structural features of the heterogeneous cell wall pectic polysaccharide rhamnogalacturonan-I are far from being understood. • The effect of the modulation of abscisic acid (ABA) concentrations and sensitivity on the detection of the LM6 1,5-arabinan epitope at the surface of Arabidopsis thaliana seedling root apices was assessed by means of fluorescence imaging. • Treatment with 50 nM ABA resulted in an increase in the detection of the LM6 epitope at the root surface in the region of the meristem.