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Coordination of differentiation rate and local patterning in compound-leaf development.

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Tomato leaf complexity is controlled by SlMP and GOB genes, which coordinate leaflet formation and shaping. These regulators interact to sculpt leaf form, revealing insights into plant development.

Keywords:
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Area of Science:

  • Plant developmental biology
  • Molecular genetics
  • Evolutionary botany

Background:

  • Leaf form exhibits immense natural variability.
  • Leaf patterning relies on differential growth within a specific morphogenetic window at the leaf marginal meristem.
  • The precise interactions of genetic regulators controlling leaf shape remain incompletely understood.

Purpose of the Study:

  • To investigate the interactions among key genetic effectors regulating compound-leaf development in tomato (Solanum lycopersicum).
  • To elucidate how differential growth and patterning factors coordinate to determine complex leaf morphology.

Main Methods:

  • Genetic analysis of tomato mutants affecting leaf development.
  • Molecular characterization of gene interactions.
  • Comparative analysis of wild-type and mutant leaf phenotypes.

Main Results:

  • Mutations in SlARF5/SlMP, a gene promoting leaflet formation, suppressed increased leaf complexity in mutants with extended morphogenetic windows.
  • Impaired function of GOBLET (GOB), a NAC/CUC transcription factor specifying leaflet boundaries, also reduced leaf complexity.
  • Genetic interaction analyses revealed that SlMP, GOB, and LYRATE (LYR) coordinately regulate leaf patterning by modulating distinct aspects of leaflet development in parallel.

Conclusions:

  • SlMP, GOB, and LYR act in concert to control tomato compound-leaf patterning.
  • Organ-level differentiation rates and local growth are coordinated by these factors to shape leaf morphology.
  • The findings offer insights into the coordination of patterning and differentiation applicable to other species and developmental processes.