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Programmed cell death in cereal aleurone.

A Fath1, P Bethke, J Lonsdale

  • 1Department of Plant and Microbial Biology, University of California, Berkeley 94720-3102, USA.

Plant Molecular Biology
|February 24, 2001
PubMed
Summary
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Programmed cell death (PCD) in cereal aleurone cells is triggered by germination or gibberellic acid (GA). Unlike apoptosis, aleurone cell death involves vacuolation and autolysis, not DNA fragmentation.

Area of Science:

  • Plant Biology
  • Cell Biology
  • Biochemistry

Background:

  • Cereal aleurone cells are specialized endosperm cells crucial for nutrient mobilization during germination.
  • These cells remain viable in mature grain but undergo programmed cell death (PCD) upon germination cues or specific hormonal treatments.
  • Abscisic acid (ABA) demonstrates a protective role, significantly extending aleurone protoplast viability.

Purpose of the Study:

  • To describe the progress in understanding programmed cell death (PCD) in cereal aleurone cells.
  • To differentiate the mechanisms of aleurone cell death from canonical apoptosis observed in animal cells.

Main Methods:

  • Incubation of isolated aleurone layers and protoplasts in specific hormonal conditions (gibberellic acid and abscisic acid).

Related Experiment Videos

  • Observation and characterization of cellular changes during aleurone cell death, including vacuolation and membrane integrity.
  • Analysis of biochemical markers associated with cell death, such as nuclease and protease activities.

    • Main Results:

    • Aleurone cell death is induced by gibberellic acid (GA) and inhibited by abscisic acid (ABA).
    • Cell death is characterized by extensive vacuolation and a sudden loss of plasma membrane integrity.
    • Key apoptotic markers like DNA fragmentation and apoptotic body formation are absent in dying aleurone cells.
    • Accumulation of nucleases and proteases, alongside organelle loss via autolysis, accompanies aleurone cell death.

    Conclusions:

    • Cereal aleurone cell death represents a distinct PCD pathway, diverging from animal cell apoptosis.
    • The process involves significant cellular autolysis driven by hydrolytic enzymes.
    • Understanding this unique PCD mechanism is vital for cereal science and germination studies.