The root meristem organization became at this stage clearly open (Fig. 4A). In order to see the long-term effects of RAM reconstruction, some roots were allowed to grow for 5 d after the treatment. It was observed that in these roots a new cap had been produced and the cells of the old disintegrating cap were already dead and highly compressed (Fig. 4B, D). Between the RC and root proper a new RCJ was arising, with the meristem becoming closed again. Neither of the above effects was observed in control roots