Key Points
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Owing to recent advances, plant vascular developmental can now be described from early specification during embryogenesis up to late differentiation events.
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Plant vascular tissues display both deterministic and plastic properties during development.
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Most of the molecular pathways controlling vascular tissue patterning involve mobile signals.
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Although a rather elaborate transcriptional network has been established for xylem differentiation processes, very little is known about phloem differentiation.
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We propose a model in which two distinctly regulated orthogonal meristems each controls a separate axis of growth to sustain tissue development as a whole.
Abstract
Vascular tissues in plants are crucial to provide physical support and to transport water, sugars and hormones and other small signalling molecules throughout the plant. Recent genetic and molecular studies have identified interconnections among some of the major signalling networks that regulate plant vascular development. Using Arabidopsis thaliana as a model system, these studies enable the description of vascular development from the earliest tissue specification events during embryogenesis to the differentiation of phloem and xylem tissues. Moreover, we propose a model for how oriented cell divisions give rise to a three-dimensional vascular bundle within the root meristem.
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Acknowledgements
The authors would like to thank Jos Wendrich, Wouter Smet and Colette ten Hove for critical reading of the manuscript. B.D.R. was funded by the Netherlands Organisation for Scientific Research (NWO; VIDI-864.13.001) and by The Research Foundation — Flanders (FWO; Odysseus II G0D0515N and Postdoc grant 12D1815N). A.P.M was funded by the Academy of Finland Centre of Excellence programme, the Academy Research Fellowship grant and the University of Helsinki. Y.H. was funded by the Gatsby Foundation, University of Helsinki, the European Research Council Advanced Investigator Grant SYMDEV, Tekes (the Finnish Funding Agency for Technology and Innovation) and the Academy of Finland Centre of Excellence programme. Research on vascular development in D.W.'s group is funded by the European Research Council (CELLPATTERN; contract number 281573) and the Netherlands Organisation for Scientific Research (NWO; ALW-831.14.003).
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Glossary
- Ground tissues
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One of the three major tissue types in plants, located between the outer layer (epidermis) and the inner vascular cylinder.
- Hypocotyl
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The embryonic stem connecting the cotyledons with the embryonic root.
- Meristem
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The actively dividing part of the plant, containing the stem cell niche.
- Periclinal division
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Cell divisions that occur parallel to the surface of the plant body, resulting in radial growth.
- Cotyledons
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The embryonic leaves of the plant; post-embryonically, the first true leaves are formed from the shoot apical meristem.
- Abaxial and adaxial
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Refers to the under and upper sides of leaves, respectively.
- Anticlinal divisions
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Cell divisions that occur perpendicular to the surface of the plant body, resulting in longitudinal growth.
- Stem cell niche
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A group of cells and the associated organizing centre, which contribute to plant growth through local cell divisions.
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De Rybel, B., Mähönen, A., Helariutta, Y. et al. Plant vascular development: from early specification to differentiation. Nat Rev Mol Cell Biol 17, 30–40 (2016). https://doi.org/10.1038/nrm.2015.6
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DOI: https://doi.org/10.1038/nrm.2015.6
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