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Lateral root formation and patterning in Medicago truncatula.

Violaine Herrbach1, Céline Remblière1, Clare Gough1

  • 1INRA, Laboratoire des Interactions Plantes-Microorganismes (LIPM), UMR441, F-31326 Castanet-Tolosan, France; CNRS, Laboratoire des Interactions Plantes-Microorganismes (LIPM), UMR2594, F-31326 Castanet-Tolosan, France.

Journal of Plant Physiology
|October 24, 2013
PubMed
Summary
This summary is machine-generated.

Legume lateral root development involves distinct cellular stages and auxin dynamics, differing from Arabidopsis. Some lateral root primordia show delayed emergence, contributing to root plasticity.

Keywords:
AuxinDR5 reporter linesLateral root developmentMedicago truncatulaPlant–microbe interaction

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Area of Science:

  • Plant Biology
  • Developmental Biology
  • Root Development

Background:

  • Legume roots are vital for anchorage, nutrition, and symbiotic nitrogen fixation with rhizobia.
  • Understanding lateral root (LR) development in legumes is crucial due to their agronomical and ecological importance.
  • Limited knowledge exists on the cellular and molecular mechanisms of LR development in legumes, especially concerning symbiotic interactions.

Purpose of the Study:

  • To detail the cellular events governing lateral root primordium (LRP) formation in Medicago truncatula.
  • To investigate the role of auxin in early LR development using reporter lines.
  • To compare LR ontogeny in legumes with model plants like Arabidopsis thaliana.

Main Methods:

  • Detailed observation of cellular events during LRP formation using thin sections.
  • Generation and analysis of transgenic Medicago truncatula lines (DR5:GUS and DR5:VENUS-N7) to track auxin accumulation.
  • Microscopic analysis of LR initiation, emergence, and associated cellular processes.

Main Results:

  • Seven distinct cellular stages of LRP formation were identified in Medicago truncatula prior to emergence.
  • Auxin accumulation, indicated by DR5:GUS expression, correlated with cell divisions in endodermal and cortical layers during LRP development.
  • Differences in LR ontogeny were observed compared to Arabidopsis thaliana, including contributions from endodermal and cortical cells.
  • A preferential zone for LR initiation was identified at 4.45 mm from the root tip.
  • A significant proportion of newly formed LRPs exhibited delayed emergence, suggesting a role in root plasticity.

Conclusions:

  • The study provides a detailed cellular and molecular framework for LR development in the legume Medicago truncatula.
  • Auxin signaling plays a key role in coordinating cell divisions during LRP formation in legumes.
  • Delayed LRP emergence represents a novel mechanism contributing to root system adaptability and plasticity in legumes.