Résumé
The complex interplay of transcriptional regulation [including AUXIN RESPONSE FACTORS (ARFs), LATERAL ORGAN BOUNDARIES DOMAINs (LBDs), or MYeloBlastosis (MYB) transcription factors] and hormone signalling (especially auxin) that controls lateral root (LR) development and its response to environmental cues is now well described in model plants.In addition to transcription factors and hormonal pathways, recent data have highlighted the role of specific metabolites, such as very long-chain fatty acids and reactive oxygen species.Evodevo studies have identified conserved auxin-dependent pathways controlling the formation of LRs or shoot-derived roots in various spermatophytes.Significant technological progress has now enabled researchers to explore this LR regulatory system at an unprecedented resolution, while also phenotyping whole-root systems. This progress bridges the gap between molecular models of regulatory networks and their physiological output in agronomically relevant conditions.
Lateral root (LR) formation is a postembryonic organogenesis process that is crucial for plant root system development and adaptation to heterogenous soil environments. Since the early 1990s, a wealth of experimental data on arabidopsis (Arabidopsis thaliana) has helped reveal the LR formation regulatory network, in which dynamic auxin distribution and transcriptional cascades direct root cells through their organogenesis pathway. Some parts of this network appear conserved across diverse plant species or distinct developmental contexts. Recently, our knowledge of this process dramatically expanded thanks to technical advances, from single cell profiling to whole-root system phenotyping. Interestingly, new players are now emerging in this network, such as fatty acids and reactive oxygen species (ROS), transforming our knowledge of this hidden half of plant biology.
Lateral root (LR) formation is a postembryonic organogenesis process that is crucial for plant root system development and adaptation to heterogenous soil environments. Since the early 1990s, a wealth of experimental data on arabidopsis (Arabidopsis thaliana) has helped reveal the LR formation regulatory network, in which dynamic auxin distribution and transcriptional cascades direct root cells through their organogenesis pathway. Some parts of this network appear conserved across diverse plant species or distinct developmental contexts. Recently, our knowledge of this process dramatically expanded thanks to technical advances, from single cell profiling to whole-root system phenotyping. Interestingly, new players are now emerging in this network, such as fatty acids and reactive oxygen species (ROS), transforming our knowledge of this hidden half of plant biology.