Laying it on thick: a study in secondary growth
Open Access
- 16 October 2021
- journal article
- review article
- Published by Oxford University Press (OUP) in Journal of Experimental Botany
- Vol. 73 (3), 665-679
- https://doi.org/10.1093/jxb/erab455
Abstract
The development of secondary vascular tissue enhances the transport capacity and mechanical strength of plant bodies, while contributing a huge proportion of the world’s biomass in the form of wood. Cell divisions in the cambium, which constitutes the vascular meristem, provide progenitors from which conductive xylem and phloem are derived. The cambium is a somewhat unusual stem cell population in two respects, making it an interesting subject for developmental research. Firstly, it arises post-germination, and thus represents a model for understanding stem cell initiation beyond embryogenesis. Secondly, xylem and phloem differentiate on opposing sides of cambial stem cells, making them bifacial in nature. Recent discoveries in Arabidopsis thaliana have provided insight into the molecular mechanisms that regulate the initiation, patterning, and maintenance of the cambium. In this review, the roles of intercellular signalling via mobile transcription factors, peptide-receptor modules and phytohormones are described. Cross-talk between these regulatory pathways is becoming increasingly apparent, yet the underlying mechanisms are not fully understood. Future study of the interaction between multiple independently identified regulators, as well as the functions of their orthologs in trees, is needed to deepen our understanding of radial growth in plants.Keywords
Funding Information
- Biotechnology and Biological Sciences Research Council (BB/V008129/1)
This publication has 144 references indexed in Scilit:
- The Arabidopsis LRR-RLK, PXC1, is a regulator of secondary wall formation correlated with the TDIF-PXY/TDR-WOX4 signaling pathwayBMC Plant Biology, 2013
- Evolutionary Relationship and Structural Characterization of the EPF/EPFL Gene FamilyPLOS ONE, 2013
- Regulation of inflorescence architecture by intertissue layer ligand–receptor communication between endodermis and phloemProceedings of the National Academy of Sciences of the United States of America, 2012
- Strigolactone signaling is required for auxin-dependent stimulation of secondary growth in plantsProceedings of the National Academy of Sciences of the United States of America, 2011
- Cell signalling by microRNA165/6 directs gene dose-dependent root cell fateNature, 2010
- Cytokinins are central regulators of cambial activityProceedings of the National Academy of Sciences of the United States of America, 2008
- Cytokinin signaling regulates cambial development in poplarProceedings of the National Academy of Sciences of the United States of America, 2008
- Plant CLE peptides from two distinct functional classes synergistically induce division of vascular cellsProceedings of the National Academy of Sciences of the United States of America, 2008
- Non-cell-autonomous control of vascular stem cell fate by a CLE peptide/receptor systemProceedings of the National Academy of Sciences of the United States of America, 2008
- Roles of Arabidopsis ATP/ADP isopentenyltransferases and tRNA isopentenyltransferases in cytokinin biosynthesisProceedings of the National Academy of Sciences of the United States of America, 2006