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A quiescent path to plant longevity.

Jefri Heyman1, Robert P Kumpf1, Lieven De Veylder1

  • 1Department of Plant Systems Biology, Vlaams Instituut voor Biotechnologie (VIB), and Department of Plant Biotechnology and Bioinformatics, Ghent University, 9052 Gent, Belgium.

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The quiescent center (QC) in plant roots acts as a reserve of backup cells. These cells replenish damaged stem cells, contributing to the remarkable longevity of long-lived trees.

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Area of Science:

  • Plant biology
  • Cellular longevity
  • Meristematic research

Background:

  • Long-lived trees like giant sequoias and bristlecone pines exhibit exceptional longevity.
  • Plant longevity is linked to the regenerative capacity of stem cells within meristems.
  • The root stem cell niche (SCN) contains a quiescent center (QC) of mitotically inactive cells.

Purpose of the Study:

  • To investigate the role of the quiescent center (QC) in plant longevity.
  • To explore the potential of QC cells as a backup system for stem cell replenishment.

Main Methods:

  • Review of recent studies on plant stem cell niches and longevity.
  • Analysis of factors influencing quiescent center cell division, such as stress phytohormones and DNA damage.

Main Results:

  • Evidence suggests that stress-related phytohormones and DNA damage can trigger QC cell division.
  • QC cell division leads to the replenishment of surrounding stem cells in the root SCN.

Conclusions:

  • The quiescent center (QC) functions as a critical pool of reserve cells.
  • This reserve cell pool is essential for replacing damaged stem cells.
  • The QC's role in stem cell replenishment significantly contributes to plant longevity.