The quiescent centre of the root apical meristem: conceptual developments from Clowes to modern times
Por:
Dubrovsky, Joseph G., Ivanov, Victor B.
Publicada:
13 oct 2021
Resumen:
In this review we discuss the concepts of the quiescent centre (QC) of
the root apical meristem (RAM) and their change over time, from their
formulation by F.A.L. Clowes to the present. This review is dedicated to
the 100th anniversary of the birth of Clowes, and we present his short
biography and a full bibliography of Clowes' work. Over time, the
concept of the QC proved to be useful for the understanding of RAM
organization and behaviour. We focus specifically on conceptual
developments, from the organization of the QC to understanding its
functions in RAM maintenance and activity, ranging from a model species,
Arabidopsis thaliana, to crops. Concepts of initial cells, stem cells,
and heterogeneity of the QC cells in the context of functional and
structural stem cells are considered. We review the role of the QC in
the context of cell flux in the RAM and the nature of quiescence of the
QC cells. We discuss the origin of the QC and fluctuation of its size in
ontogenesis and why the QC cells are more resistant to stress.
Contemporary concepts of the organizer and stem cell niche are also
considered. We also propose how the stem cell niche in the RAM can be
defined in roots of a non-model species.
Filiaciones:
Univ Nacl Autonoma Mexico, Inst Biotecnol, Dept Biol Mol Plantas, Cuernavaca 62210, Morelos, Mexico
Russian Acad Sci, Timiryazev Inst Plant Physiol, Dept Root Physiol, Moscow 127276, Russia
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