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Related Experiment Videos

Programmed cell death in plants: ultrastructural changes in pea guard cells.

L E Bakeeva1, E V Dzyubinskaya, V D Samuilov

  • 1Belozersky Institute of Physico-Chemical Biology, Lomonosov Moscow State University, Moscow, 119992, Russia.

Biochemistry. Biokhimiia
|November 4, 2005
PubMed
Summary

Cyanide (CN-) exposure triggers apoptosis in pea plant stomatal guard cells, leading to nuclear and cellular destruction. An antioxidant protected cells, confirming the apoptosis mechanism in plant cell death.

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Area of Science:

  • Plant Cell Biology
  • Plant Physiology
  • Toxicology

Background:

  • Stomatal guard cells regulate plant gas exchange and water balance.
  • Understanding plant cell death mechanisms is crucial for agriculture and environmental science.
  • Cyanide is a potent toxin affecting cellular respiration.

Purpose of the Study:

  • To investigate the effects of cyanide (CN-) on pea plant stomatal guard cells.
  • To elucidate the mechanism of CN--induced cell death in these cells.
  • To observe ultrastructural changes using light and electron microscopy.

Main Methods:

  • Treatment of isolated pea leaf epidermal peels with cyanide (CN-).
  • Microscopic observation (light and electron microscopy) of guard cells.

Related Experiment Videos

  • Incubation with an antioxidant (di-tert-butyl-4-hydroxytoluene) to assess protective effects.

    • Main Results:

    • Cyanide induced destruction of guard cell nuclei, accelerated by light.
    • Ultrastructural analysis revealed progressive changes including chromatin margination, ER swelling, and vacuolation.
    • Chloroplasts lost membrane integrity but retained internal structure; an antioxidant prevented observed damage.

    Conclusions:

    • Cyanide (CN-) induces programmed cell death (apoptosis) in pea stomatal guard cells.
    • The observed ultrastructural changes are characteristic of the apoptotic pathway.
    • This study provides insights into plant cellular responses to toxic environmental factors.