![]() ![]() Mobile shoot-derived TCTP1 gene products act specifically to enhance the frequency of lateral root initiation and emergence sites along the primary root pericycle, while root elongation is controlled by local constitutive TCTP1 expression and scion size. AtTCTP1 encodes mRNAs with long-distance mobility between the shoot and roots. AtTCTP1 modulates root system architecture through a dual function: as a general constitutive growth promoter enhancing root elongation and as a systemic signalling agent via mobility in the vasculature. Here we provide evidence for a role for translationally controlled tumour protein (TCTP) in regulating the iterative formation of lateral roots in Arabidopsis. How this plasticity is regulated at the whole-organism level is elusive. These give them an extraordinary developmental plasticity to modulate their size and architecture according to environmental constraints and opportunities. However, in contrast to animals, plants have the ability to generate new organs throughout their whole life. The plant body plan and primary organs are established during embryogenesis. We propose that the ability to activate a common transition state with context-specific regulators allows the remarkable developmental plasticity found in plants.One Sentence SummaryHighly conserved superlocus of LBD genes, acting within an early transition identity, regulates shoot-borne and lateral root formation. Evolutionary analysis revealed that SBRL function is deeply conserved in angiosperms and that it arose as part of an ancient duplicated superlocus, only lost in root-less plants, containing both shoot-borne and lateral root initiation regulators. ![]() Analysis of this population identified a transcription factor required for the formation of shoot-borne-roots which we named SHOOT BORNE ROOTLESS (SBRL). Using single-cell profiling of tomato (Solanum lycoperiscum) stems we isolated a rare transient cell population that serve as progenitors for shoot-borne-root meristems. While underground lateral roots initiate from designated cells in the main root, an unknown mechanism allows cells to bypass the root/shoot identity trajectory and generate shoot-borne-roots. AbstractDuring plant post-embryonic growth new meristems and associated stem cells form in different development contexts in order to respond to environmental cues. ![]()
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