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Programmed cell death during embryogenesis in maize.

Concetta Giuliani1, Gabriella Consonni, Giuseppe Gavazzi

  • 1Dipartimento di Genetica e di Biologia dei microrganismi, Università degli Studi di Milano, Italy.

Annals of Botany
|August 29, 2002
PubMed
Summary
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Programmed cell death (PCD) in maize embryos involves DNA fragmentation in specific tissues like the suspensor during development. These PCD events are confined to structures not contributing to the adult plant.

Area of Science:

  • Plant Biology
  • Developmental Biology
  • Molecular Biology

Background:

  • Programmed cell death (PCD) is a vital process in plant development.
  • Understanding PCD in plant embryogenesis is crucial for developmental biology.

Purpose of the Study:

  • To investigate programmed cell death during maize (Zea mays L.) embryogenesis.
  • To identify specific tissues and developmental stages exhibiting PCD.

Main Methods:

  • Terminal deoxyribonucleotidyl transferase-mediated dUTP-fluorescein nick end labelling (TUNEL) assay for DNA fragmentation.
  • Genomic DNA ladder detection to confirm PCD.

Main Results:

  • DNA fragmentation, indicative of PCD, was observed in specific maize embryonic tissues.

Related Experiment Videos

  • TUNEL-positive nuclei were prominent in the scutellum, coleoptile, root cap, and suspensor between 14-20 days after pollination.
  • DNA laddering confirmed PCD in these tissues.

    • Conclusions:

    • Programmed cell death in maize embryogenesis is spatially and temporally regulated.
    • PCD events are primarily restricted to embryonic structures that do not form part of the mature plant, such as the suspensor.
    • These findings highlight the role of PCD in sculpting the developing maize embryo.