Pluripotent Pericycle Cells Trigger Different Growth Outputs by Integrating Developmental Cues into Distinct Regulatory Modules
Wei Xiao, David Molina, Dagmar Ripper, Joop Vermeer & Laura Ragni
| Résumé |
During post-embryonic development, the pericycle specifies the stem
cells that give rise to both lateral roots (LRs) and the periderm,
a suberized barrier that protects the plant against biotic and
abiotic stresses. Comparable auxin-mediated signaling hubs regulate
meristem establishment in many developmental contexts; however, it
is unknown how specific outputs are achieved. Using the Arabidopsis
root as a model, we show that while LR formation is the main
auxin-induced program after de-etiolation, plants with age become
competent to form a periderm in response to auxin. The
establishment of the vascular cambium acts as the developmental
switch required to trigger auxin-mediated periderm initiation.
Moreover, distinct auxin signaling components and targets control
LR versus periderm formation. Among the periderm-specific-promoting
transcription factors, WUSCHEL-RELATED HOMEOBOX 4 (WOX4) and
KNAT1/BREVIPEDICELLUS (BP) stand out as their specific
overexpression in the periderm results in an increased number of
periderm layers, a trait of agronomical importance in breeding
programs targeting stress tolerance. These findings reveal that
specificity in pericycle stem cell fate is achieved by the
integration of developmental cues into distinct regulatory
modules. |
| Mots-clés |
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| Citation | Xiao, W., Molina, D., Ripper, D., Vermeer, J., & Ragni, L. (2020). Pluripotent Pericycle Cells Trigger Different Growth Outputs by Integrating Developmental Cues into Distinct Regulatory Modules. Current Biology, 30, 4384-4398. |
| Type | Article de périodique (Anglais) |
| Date de publication | 10-9-2020 |
| Nom du périodique | Current Biology |
| Volume | 30 |
| Pages | 4384-4398 |
| URL | https://www.sciencedirect.com/science/article/pii/S096098... |
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