2007
DOI: 10.1242/dev.02753
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Auxin-dependent regulation of lateral root positioning in the basal meristem ofArabidopsis

Abstract: In plants, the developmental mechanisms that regulate the positioning of lateral organs along the primary root are currently unknown. We present evidence on how lateral root initiation is controlled in a spatiotemporal manner in the model plant Arabidopsis thaliana. First, lateral roots are spaced along the main axis in a regular left-right alternating pattern that correlates with gravity-induced waving and depends on AUX1, an auxin influx carrier essential for gravitropic response. Second, we found evidence t… Show more

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Cited by 566 publications
(706 citation statements)
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“…Based on data showing that the pericycle remains in G1 phase of the cell cycle (Beeckman et al, 2001) and that the xylem pole pericycle continues to cycle after leaving the RAM (Dubrovsky et al, 2000), it has been postulated that the pericycle acts as an extended monolayered meristem (Casimiro et al, 2003). While pericycle division is first visible in the differentiation zone well above the dividing RAM, xylem pole pericycle founder cells first need to be primed in the basal meristem (close to the elongation zone) in order to trigger LRP initiation (De Smet et al, 2007). Despite the loss of mitotic activity in the shr RAM, pericycle cells retain their ability to initiate new LRP (Figs.…”
Section: Shr Is Required For Lateral Root Formation In a Mannermentioning
confidence: 99%
“…Based on data showing that the pericycle remains in G1 phase of the cell cycle (Beeckman et al, 2001) and that the xylem pole pericycle continues to cycle after leaving the RAM (Dubrovsky et al, 2000), it has been postulated that the pericycle acts as an extended monolayered meristem (Casimiro et al, 2003). While pericycle division is first visible in the differentiation zone well above the dividing RAM, xylem pole pericycle founder cells first need to be primed in the basal meristem (close to the elongation zone) in order to trigger LRP initiation (De Smet et al, 2007). Despite the loss of mitotic activity in the shr RAM, pericycle cells retain their ability to initiate new LRP (Figs.…”
Section: Shr Is Required For Lateral Root Formation In a Mannermentioning
confidence: 99%
“…LRs in Arabidopsis are derived from a subset of pericycle cells, termed pericycle founder cells, which are adjacent to the two xylem poles (for review, see Casimiro et al, 2003;De Smet et al, 2006). LR initiation (LRI) is thought to go through two independent checkpoints (De Smet et al, 2007;Dubrovsky et al, 2008). First, priming of pericycle founder cells occurs in the basal meristem, which is a region at the transition between the meristem and the elongation zone of the root.…”
mentioning
confidence: 99%
“…Here, PINmediated auxin accumulation in one or two cells of the xylem-pole pericycle is sufficient to initiate a lateral root primordium and subsequent patterns of PIN protein expression and polarity sustain an auxin distribution that drives the entire lateral root developmental program (Casimiro et al 2001;Benkova et al 2003;De Smet et al 2006). Interestingly, the regular spacing of lateral roots in Arabidopsis seems to be based on a transient oscillatory increase in AFB-Aux/IAA-ARF activity in pericycle cells that are transiting the basal root meristem, several millimeters distal to the eventual site of lateral root emergence (De Smet et al 2007). This suggests that this early auxin response might prime subsets of xylem-pole pericycle cells to respond differently (more readily) to later auxin activation of primordium initiation in the older root (De Smet et al 2007).…”
Section: Auxin Gradients Auxin Response and Developmental Controlmentioning
confidence: 99%
“…Interestingly, the regular spacing of lateral roots in Arabidopsis seems to be based on a transient oscillatory increase in AFB-Aux/IAA-ARF activity in pericycle cells that are transiting the basal root meristem, several millimeters distal to the eventual site of lateral root emergence (De Smet et al 2007). This suggests that this early auxin response might prime subsets of xylem-pole pericycle cells to respond differently (more readily) to later auxin activation of primordium initiation in the older root (De Smet et al 2007). It is therefore possible that this priming of otherwise identical pericycle cells represents a hysteretic presensitization of the system.…”
Section: Auxin Gradients Auxin Response and Developmental Controlmentioning
confidence: 99%