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Related Experiment Videos

Is microtubule disassembly a trigger for cold acclimation?

Albina Abdrakhamanova1, Qi Yan Wang, Ludmila Khokhlova

  • 1Institut für Biologie II, Schänzlestr. 1, 79104 Freiburg, Germany.

Plant & Cell Physiology
|July 26, 2003
PubMed
Summary
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Winter wheat (Triticum aestivum L.) acclimation involves microtubule disassembly, promoting freezing tolerance. This process, crucial for cold adaptation, is faster in tolerant cultivars.

Area of Science:

  • Plant Physiology
  • Molecular Biology
  • Agricultural Science

Background:

  • Winter wheat (Triticum aestivum L.) requires cold acclimation to survive freezing temperatures.
  • Root growth is a key indicator of plant stress response and acclimation.
  • The molecular mechanisms underlying cold acclimation and freezing tolerance are not fully understood.

Purpose of the Study:

  • To investigate the role of microtubules during cold acclimation in winter wheat cultivars with varying freezing tolerance.
  • To determine the relationship between microtubule dynamics, root growth recovery, and the development of freezing tolerance.
  • To explore the potential of manipulating microtubule stability to induce freezing tolerance.

Main Methods:

  • Monitoring root growth rates in three winter wheat cultivars during a 7-day cold acclimation period at 4°C.

Related Experiment Videos

  • Assessing freezing tolerance through cold shock tests at various acclimation intervals.
  • Observing microtubule dynamics using microscopy and analyzing alpha-tubulin isotype abundance during acclimation.
  • Experimentally inducing microtubule disassembly using the herbicide pronamide.

    • Main Results:

    • Root growth recovery during acclimation was faster in freezing-tolerant cultivars compared to sensitive ones.
    • Tolerant cultivars exhibited a transient, partial microtubule disassembly preceding the formation of cold-stable microtubules and growth recovery.
    • This transient disassembly was absent in sensitive cultivars but could be artificially induced by pronamide, conferring freezing tolerance.
    • Cold-stable microtubules correlated with reduced abundance of TUA1/2 alpha-tubulin isotypes.

    Conclusions:

    • Microtubule disassembly plays a critical role in sensing low-temperature stress and initiating cold acclimation in winter wheat.
    • The transient disassembly of microtubules is a key event preceding the development of freezing tolerance.
    • Targeting microtubule dynamics offers a potential strategy for enhancing crop cold hardiness.