Wheeldon, CD and Bennett, T orcid.org/0000-0003-1612-4019 (2020) There and back again: an evolutionary perspective on long-distance coordination of plant growth and development. Seminars in Cell and Developmental Biology. ISSN 1084-9521
Abstract
Vascular plants, unlike bryophytes, have a strong root-shoot dichotomy in which the tissue systems are mutually interdependent; roots are completely dependent on shoots for photosynthetic sugars, and shoots are completely dependent on roots for water and mineral nutrients. Long-distance communication between shoot and root is therefore critical for the growth, development and survival of vascular plants, especially with regard to variable environmental conditions. However, this long-distance signalling does not appear an ancestral feature of land plants, and has likely arisen in vascular plants to service the radical alterations in body-plan seen in this taxon. In this review, we examine the defined hormonal root-to-shoot and shoot-to-root signalling pathways that coordinate the growth of vascular plants, with a particular view to understanding how these pathways may have evolved. We highlight the completely divergent roles of isopentenyl-adenine and trans-zeatin cytokinin species in long-distance signalling, and ask whether cytokinin can really be considered as a single class of hormones in the light of recent research. We also discuss the puzzlingly sparse evidence for auxin as a shoot-to-root signal, the evolutionary re-purposing of strigolactones and gibberellins as hormonal signals, and speculate on the possible role of sugars as long-distance signals. We conclude by discussing the ‘design principles’ of long-distance signalling in vascular plants.
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Copyright, Publisher and Additional Information: | © 2020, Elsevier. All rights reserved. This is an author produced version of an article published in Seminars in Cell and Developmental Biology. Uploaded in accordance with the publisher's self-archiving policy. | ||||
Keywords: | Phytohormones; Long-distance signalling; Strigolactone; Cytokinin; Gibberellin; Auxin; Plant development; Plant evolution | ||||
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Institution: | The University of Leeds | ||||
Academic Units: | The University of Leeds > Faculty of Biological Sciences (Leeds) > School of Biology (Leeds) | ||||
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Depositing User: | Symplectic Publications | ||||
Date Deposited: | 30 Jun 2020 10:02 | ||||
Last Modified: | 20 Jun 2021 00:38 | ||||
Status: | Published online | ||||
Publisher: | Elsevier | ||||
Identification Number: | https://doi.org/10.1016/j.semcdb.2020.06.011 |
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Filename: Wheeldon & Bennett 2020 Accepted Version (1).pdf
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