Fig. 5

Competition for auxin among nearby primordia. a Quantification of the reduction of the auxin concentration in the pericycle downstream of the induction site (labels indicate the distance in number of cells; the position where the second (downstream) primordium would be induced is indicated with a thick line (“+9”)). b, c: Auxin concentration in (the center of) the pericycle cell and C5 inner cortical cell closest to the DS production site upstream (b) or downstream (c) at time since the initiation of the respective primordium. Line labels are shared between top and bottom panels: red lines indicate the upstream primordium was initiated first and cyan lines indicate the downsteam primordium was initiated first. The concentration increase in absence of a second primordium is indicated by dotted-dashed gray lines in (c). d–g: Labels on the left indicate how long before the downstream (right) primordium the induction of the upstream (left) primordium was initiated, labels on the top indicate time since the initiation of the second primordium. d, e Upstream primordium induced first. f, g Downstream primordium induced first