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Ageing in plants.

Howard Thomas1

  • 1Cell Biology Department, Institute of Grassland and Environmental Research, Plas Gogerddan, Aberystwyth, SY23 3EB, Ceredigion, UK. sid.thomas@bbsrc.ac.uk

Mechanisms of Ageing and Development
|March 1, 2002
PubMed
Summary
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Most plants do not age like animals. Their longevity is determined by programmed growth and cell death, with mechanisms to manage genetic damage in long-lived species.

Area of Science:

  • Plant biology
  • Gerontology
  • Developmental biology

Background:

  • Plant aging differs fundamentally from animal aging.
  • Plant persistence relies on meristem status and programmed cell death strategies.
  • Longevity in plants is a balance between growth and tissue death.

Purpose of the Study:

  • To investigate the unique aging processes in green plants.
  • To differentiate plant senescence from stress-induced aging.
  • To explore mechanisms underlying extreme plant longevity.

Main Methods:

  • Analysis of meristem function in determinate and indeterminate growth.
  • Examination of cell death and resource reallocation strategies.
  • Investigation of genetic damage accumulation and selection in plant meristems.

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Main Results:

  • Plant senescence and organ elimination are programmed developmental phases, not stress responses.
  • Meristems in long-lived plants manage genetic damage, potentially exploiting somatic mutations.
  • Plant longevity is linked to the balance between growth and programmed tissue death.

Conclusions:

  • Most plants do not age in the strict gerontological sense.
  • Extreme longevity in trees and clonal perennials is maintained by selection and correction at the cellular level.
  • Programmed development, not stress, governs plant aging and longevity.