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Lateral root initiation in Arabidopsis: developmental window, spatial patterning, density and predictability.

J G Dubrovsky1, G A Gambetta, A Hernández-Barrera

  • 1Departamento de Biología Molecular de Plantas, Instituto de Biotecnología, Universidad Nacional Autónoma de México, Apartado Postal 510-3, 62250 Cuernavaca, Morelos, Mexico. jdubrov@ibt.unam.mx

Annals of Botany
|January 5, 2006
PubMed
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Lateral root initiation in Arabidopsis occurs within a specific developmental window. While precise spacing mechanisms are absent, overall branching density is accession-specific and predictable.

Area of Science:

  • Plant Biology
  • Developmental Biology
  • Genetics

Background:

  • Lateral root (LR) initiation is a fundamental process in plant development.
  • The precise regulatory mechanisms governing LR initiation remain largely unknown.
  • Understanding LR initiation is crucial for optimizing plant architecture and function.

Purpose of the Study:

  • To characterize the spatial and temporal patterns of lateral root initiation.
  • To define the developmental window during which LR initiation occurs.
  • To investigate the predictability of LR initiation events.

Main Methods:

  • Spatial patterning of lateral roots and primordia analyzed on cleared root preparations.
  • Novel LR and primordia density measures introduced for accurate quantification.

Related Experiment Videos

  • Time-lapse experiments using enhancer trap line J0121 monitored LR initiation.
  • Plasmolysis-based method determined cell counts between successive primordia.

    • Main Results:

    • Lateral root primordia initiated strictly acropetally, without de novo events between existing ones.
    • Longitudinal spacing of lateral organs was variable, influenced by cell number and initiation time.
    • Alternation in initiation occurred between adjacent pericycle cell files.
    • LR density increased over time, influenced by developing primordia, and is accession-specific.

    Conclusions:

    • Arabidopsis exhibits a narrow developmental window for lateral root initiation.
    • No specific cell-count or distance-measuring mechanisms dictate successive initiation sites.
    • Branching and lateral organ densities are accession-specific and allow prediction of average LR spacing.