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Related Experiment Videos

Root cell patterning: a primary target for aluminium toxicity in maize.

Snezhanka Doncheva1, Montserrat Amenós, Charlotte Poschenrieder

  • 1Laboratorio de Fisiología Vegetal, Facultad de Ciencias, Universidad Autónoma de Barcelona, E-08193 Bellaterra, Spain. juan.barcelo@uab.es

Journal of Experimental Botany
|March 2, 2005
PubMed
Summary

Aluminum (Al) rapidly alters cell division in sensitive maize root tips, affecting cell patterning within minutes. Resistant maize varieties showed no such changes, suggesting a role for auxin transport inhibition.

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Area of Science:

  • Plant Biology
  • Environmental Toxicology
  • Cell Biology

Background:

  • Aluminum (Al) toxicity is a major agricultural concern, especially in acidic soils.
  • Understanding the rapid effects of Al on plant root development is crucial for developing Al-resistant crops.
  • Zea mays (maize) is a vital crop susceptible to Al toxicity.

Purpose of the Study:

  • To investigate the short-term effects of aluminum on cell division in maize root tips.
  • To compare the responses of Al-sensitive and Al-resistant maize varieties to aluminum exposure.
  • To elucidate the potential mechanisms behind Al-induced alterations in root cell patterning.

Main Methods:

  • Exposure of Zea mays L. root tips to 50 microM Al for 5-180 minutes.
  • Visualization of bromodeoxyuridine incorporation into S-phase nuclei using immunofluorescence and confocal laser fluorescence microscopy.

Related Experiment Videos

  • Comparison of cell division patterns in Al-sensitive and Al-resistant maize varieties.

    • Main Results:

    • Al exposure (5 min) inhibited cell division in the meristem of Al-sensitive maize.
    • Cell division was stimulated in the distal elongation zone, leading to lateral root formation.
    • No significant changes in cell division were observed in Al-resistant maize.
    • Naphthylphthalamic acid mimicked Al-induced changes, suggesting auxin transport inhibition.

    Conclusions:

    • Aluminum induces rapid, specific changes in root cell patterning, not general toxicity.
    • Al-resistance in maize is associated with the absence of these rapid cell division alterations.
    • Inhibition of auxin transport is a likely mechanism mediating Al's effect on root cell patterning.