Stem cell regulators drive a G1 duration gradient during plant root development
Clara Echevarría1, Bénédicte Desvoyes2, Marco Marconi3
1Centro de Biología Molecular Severo Ochoa, CSIC-UAM, Madrid, Spain.
Nature Plants
|September 18, 2025
Summary
Plant root development involves a G1 duration gradient, regulated by stem cell genes like PLETHORA and cell cycle genes like RETINOBLASTOMA-RELATED 1, influencing organogenesis.
Area of Science:
- Plant developmental biology
- Cell cycle regulation
- Root meristem dynamics
Background:
- Organogenesis requires coordinated cell proliferation and developmental programs.
- Stem cell regulators control proliferation in plant meristems, but their link to cell cycle machinery is unclear.
Purpose of the Study:
- To investigate the mechanisms linking stem cell regulators to cell cycle machinery in the Arabidopsis root meristem.
- To identify how cell proliferation is controlled during root development.
Main Methods:
- Analysis of G1 duration gradients in Arabidopsis root meristems.
- Genetic manipulation of PLETHORA (PLT) and RETINOBLASTOMA-RELATED 1 genes.
- Computer modeling of regulatory networks.
Main Results:
- A proximal-distal G1 duration gradient was identified in the root meristem (~2h to >20h).
- Mutations in PLT and RETINOBLASTOMA-RELATED 1 genes abolished this gradient.
- PLT genes act as drivers, inhibiting G1 progression via KRP5 and RETINOBLASTOMA-RELATED 1.
Conclusions:
- A novel proximal-distal G1 duration gradient is established during root development.
- This gradient is shaped by the interplay of stem cell maintenance and cell cycle regulators.
- The G1 gradient correlates with increased tolerance to genome damage.
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